LorenzoTomaz / Unity3dSampleTemplate

Unity3d sample template ti work with Nethereum

Unity3d Sample Template Net472 / Netstandard

Sample template to get started Unity3d development using Nethereum. It includes the necessary dlls from the Net472AOT Common release (commmon libraries for general tasks, not specialised ones like geth, reactive, etc) in the asset folder. Netstandard libraries work the same. You may not need some of the libraries so you can remove them, depending on your needs.

Unity Version used is 2021.3.6f1 LTS

Dlls: Nethereum, dependencies (BouncyCastle, Microsoft.Extensions.Logging.Abstractions, NBitcoin.dll for HD Wallet)

The code demonstrates:

• Output to the log the current BlockNumber using Unity.UI both in Async and coroutines
• Ether transfer using Unity.UI and coroutines
• Using 1559 Suggestion strategies or Legacy mode when tranfering Ether
• Smart contract deployment (ERC20), Transactions (Transfer) and Querying (Balance)
• Cross Platform architecture (Coroutines) reuse your code using different deployments Native /Desktop or Browser using Metamask)
• Metamask connectivity in browser

Note:

• WebGl only supports coroutines UnityWebRequest. To build WebGl if having issues, uncheck Development Build.
• To support WebGl and AOT this sample uses the Net472AOT or NetstandardAOT dlls with the custom Json.Net Unity by Unity
• Please remember to remove System.HttpClient and UnityEngine of the Nethereum release package if included
• Nethereum.Unity.Metamask is only supported in Webgl, ignore it for other platforms (not the editor)
• If creating a custom index.html file, or rebuilding webgl in a new folder, the script needs to instantiate nethereumUnityInstance as per the example here: https://github.com/Nethereum/Unity3dSampleTemplate/blob/master/webgl/index.html#L112

Desktop demo

Browser demo

To run a local blockchain you can just use the preconfigured testchains

BlockNumber query Async (vanilla Nethereum)

using System;
using System.Collections;
using System.Collections.Generic;
using System.Net;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
using Nethereum.ABI.FunctionEncoding.Attributes;
using UnityEngine;
using UnityEngine.UI;
using Nethereum.Contracts;
using Nethereum.Web3;


public class GetLatestBlockVanillaNethereum : MonoBehaviour {

    private static bool TrustCertificate(object sender, X509Certificate x509Certificate, X509Chain x509Chain, SslPolicyErrors sslPolicyErrors)
    {
        // all certificates are accepted
        return true;
    }

    public string Url = "https://mainnet.infura.io";
   
    public InputField ResultBlockNumber;
    public InputField InputUrl;

    // Use this for initialization
    void Start()
    {
        InputUrl.text = Url;
    }

    public async void GetBlockNumber()
	{
        Url = InputUrl.text;
        //This is to workaround issue with certificates https://forum.unity.com/threads/how-to-allow-self-signed-certificate.522183/
        //Uncomment if needed
        // ServicePointManager.ServerCertificateValidationCallback = TrustCertificate;
        var web3 = new Web3(Url);
        
        var blockNumber = await web3.Eth.Blocks.GetBlockNumber.SendRequestAsync();
        ResultBlockNumber.text = blockNumber.Value.ToString();
    }
}

BlockNumber query Coroutines

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using Nethereum.JsonRpc.UnityClient;
using Nethereum.RPC.Eth.DTOs;
using Nethereum.Util;

public class GetLatestBlockCoroutine : MonoBehaviour
{
    public string Url = "https://mainnet.infura.io";

    public InputField ResultBlockNumber;
    public InputField InputUrl;

    // Use this for initialization
    void Start()
    {
        InputUrl.text = Url;
    }

    public void GetBlockNumberRequest()
    {
        StartCoroutine(GetBlockNumber());
    }

    public IEnumerator GetBlockNumber()
    {
        Url = InputUrl.text;

        var blockNumberRequest = new EthBlockNumberUnityRequest(Url);

        yield return blockNumberRequest.SendRequest();

        ResultBlockNumber.text = blockNumberRequest.Result.Value.ToString();
    }
}

Simple Ether transfer

To transfer Ether Nethereum provides a specific Unity Request, the EthTransferUnityRequest.

The EthTransferUnityRequest it is instantiated with the "url" of our Ethereum client, the private key to be able to sign transactions and our account address (the same of the private key).

var url = "http://localhost:8545";
var privateKey = "0xb5b1870957d373ef0eeffecc6e4812c0fd08f554b37b233526acc331bf1544f7"; 
var ethTransfer = new EthTransferUnityRequest(url, privateKey, "YOURCHAINID");

Once our unity request is instantiated it we can initiate the transfer as follows using Legacy Mode providing 2 Gwei as the gas price

var receivingAddress = "0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe";
yield return ethTransfer.TransferEther(receivingAddress, 1.1m, 2);

Here we have specified the receivingAddress, the amount to send and the optional gas price in Gwei. The request will automatically convert the gas price to Wei.

We can validate afterwards if we have had any exception as following:

if (ethTransfer.Exception != null)
{
    Debug.Log(ethTransfer.Exception.Message);
    yield break;
}

If no errors have occurred we can retrieve the transaction hash from the Request and Poll every 2 seconds to wait for the transaction to be mined.

 var transactionHash = ethTransfer.Result;
//create a poll to get the receipt when mined
var transactionReceiptPolling = new TransactionReceiptPollingRequest(url);
//checking every 2 seconds for the receipt
yield return transactionReceiptPolling.PollForReceipt(transactionHash, 2);

Finally we can check the balance of our recieving account, using EthGetBalanceUnityRequest. Note that we specify we want the balance for the latest Block when doing the request.

var balanceRequest = new EthGetBalanceUnityRequest(url);
yield return balanceRequest.SendRequest(receivingAddress, BlockParameter.CreateLatest());

We can convert the result in Wei to Eth using the default Wei UnitConvertor.

Debug.Log("Balance of account:" + UnitConversion.Convert.FromWei(balanceRequest.Result.Value));

EIP 1559 Fee suggestion using the strategies provided and Legacy Mode

Here are some examples of using the provided fee suggestion strategies using coroutines, TimePreference, MedianFeeHistory or LegacyMode to use the old mode or to use with other chains.

To use LegacyMode you have to provide the GasPrice or it can be force the LegacyMode by setting UseLegacyAsDefault to true.

       if (feeStrategy == FeeStrategy.TimePreference)
        {
            Debug.Log("Time Preference");
            var timePreferenceFeeSuggestion = new TimePreferenceFeeSuggestionUnityRequestStrategy(Url);

            yield return timePreferenceFeeSuggestion.SuggestFees();

            if (timePreferenceFeeSuggestion.Exception != null)
            {
                Debug.Log(timePreferenceFeeSuggestion.Exception.Message);
                yield break;
            }

            //lets get the first one so it is higher priority
            Debug.Log(timePreferenceFeeSuggestion.Result.Length);
            if (timePreferenceFeeSuggestion.Result.Length > 0)
            {
                Debug.Log(timePreferenceFeeSuggestion.Result[0].MaxFeePerGas);
                Debug.Log(timePreferenceFeeSuggestion.Result[0].MaxPriorityFeePerGas);
            }
            var fee = timePreferenceFeeSuggestion.Result[0];

            yield return ethTransfer.TransferEther(receivingAddress, Amount, fee.MaxPriorityFeePerGas.Value, fee.MaxFeePerGas.Value);
            if (ethTransfer.Exception != null)
            {
                Debug.Log(ethTransfer.Exception.Message);
                yield break;
            }
        }


        if(feeStrategy == FeeStrategy.MedianFeeHistory)
        {
            Debug.Log("MedianFeeHistory mode");
            var medianPriorityFeeStrategy = new MedianPriorityFeeHistorySuggestionUnityRequestStrategy(Url);

            yield return medianPriorityFeeStrategy.SuggestFee();

            if (medianPriorityFeeStrategy.Exception != null)
            {
                Debug.Log(medianPriorityFeeStrategy.Exception.Message);
                yield break;
            }
            
            Debug.Log(medianPriorityFeeStrategy.Result.MaxFeePerGas);
            Debug.Log(medianPriorityFeeStrategy.Result.MaxPriorityFeePerGas);
            
            var fee = medianPriorityFeeStrategy.Result;

            yield return ethTransfer.TransferEther(receivingAddress, Amount, fee.MaxPriorityFeePerGas.Value, fee.MaxFeePerGas.Value);
            if (ethTransfer.Exception != null)
            {
                Debug.Log(ethTransfer.Exception.Message);
                yield break;
            }
        }

        if (feeStrategy == FeeStrategy.Legacy)
        {
            Debug.Log("Legacy mode");
            //I am forcing the legacy mode but also I am including the gas price
            ethTransfer.UseLegacyAsDefault = true;

            yield return ethTransfer.TransferEther(receivingAddress, Amount, GasPriceGwei);

            if (ethTransfer.Exception != null)
            {
                Debug.Log(ethTransfer.Exception.Message);
                yield break;
            }

        }

Full sample

using System;
using System.Collections;
using System.Collections.Generic;
using System.Numerics;
using System.Runtime.InteropServices;
using Nethereum.ABI.FunctionEncoding.Attributes;
using Nethereum.ABI.Model;
using Nethereum.Contracts;
using Nethereum.Contracts.CQS;
using Nethereum.Contracts.Extensions;
using Nethereum.Hex.HexConvertors.Extensions;
using Nethereum.Hex.HexTypes;
using Nethereum.JsonRpc.UnityClient;
using Nethereum.RPC.Eth.DTOs;
using Nethereum.RPC.TransactionManagers;
using Nethereum.Signer;
using Nethereum.Util;
using Nethereum.Web3.Accounts;
using UnityEngine;
using UnityEngine.UI;

public class EtherTransferCoroutinesUnityWebRequest : MonoBehaviour {

    public string Url = "http://localhost:8545";
    public string PrivateKey = "0xb5b1870957d373ef0eeffecc6e4812c0fd08f554b37b233526acc331bf1544f7";
    public string AddressTo = "0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe";
    public decimal Amount = 1.1m;
    public decimal GasPriceGwei = 2;
    public string TransactionHash = "";
    public decimal BalanceAddressTo = 0m;

    public InputField InputUrl;
    public InputField InputPrivateKey;
    public InputField InputAddressTo;
    public InputField InputAmount;

    public InputField ResultBalanceAddressTo;
    public InputField ResultTxnHash;

    // Use this for initialization
    void Start () {

        InputUrl.text = Url;
        InputPrivateKey.text = PrivateKey;
        InputAddressTo.text = AddressTo;
        InputAmount.text = Amount.ToString();

    }

    public void TransferRequest()
    {
        StartCoroutine(TransferEther());
    }

    public enum FeeStrategy
    {
        Legacy,
        TimePreference,
        MedianFeeHistory
    }

    //Sample of new features / requests
    public IEnumerator TransferEther()
    {
        Url = InputUrl.text;
        PrivateKey = InputPrivateKey.text;
        AddressTo = InputAddressTo.text;
        Amount = System.Decimal.Parse(InputAmount.text);

        //initialising the transaction request sender
        var ethTransfer = new EthTransferUnityRequest(Url, PrivateKey, 444444444500);

        var receivingAddress = AddressTo;

        var feeStrategy = FeeStrategy.Legacy;

        if (feeStrategy == FeeStrategy.TimePreference)
        {
            Debug.Log("Time Preference");
            var timePreferenceFeeSuggestion = new TimePreferenceFeeSuggestionUnityRequestStrategy(Url);

            yield return timePreferenceFeeSuggestion.SuggestFees();

            if (timePreferenceFeeSuggestion.Exception != null)
            {
                Debug.Log(timePreferenceFeeSuggestion.Exception.Message);
                yield break;
            }

            //lets get the first one so it is higher priority
            Debug.Log(timePreferenceFeeSuggestion.Result.Length);
            if (timePreferenceFeeSuggestion.Result.Length > 0)
            {
                Debug.Log(timePreferenceFeeSuggestion.Result[0].MaxFeePerGas);
                Debug.Log(timePreferenceFeeSuggestion.Result[0].MaxPriorityFeePerGas);
            }
            var fee = timePreferenceFeeSuggestion.Result[0];

            yield return ethTransfer.TransferEther(receivingAddress, Amount, fee.MaxPriorityFeePerGas.Value, fee.MaxFeePerGas.Value);
            if (ethTransfer.Exception != null)
            {
                Debug.Log(ethTransfer.Exception.Message);
                yield break;
            }
        }


        if(feeStrategy == FeeStrategy.MedianFeeHistory)
        {
            Debug.Log("MedianFeeHistory mode");
            var medianPriorityFeeStrategy = new MedianPriorityFeeHistorySuggestionUnityRequestStrategy(Url);

            yield return medianPriorityFeeStrategy.SuggestFee();

            if (medianPriorityFeeStrategy.Exception != null)
            {
                Debug.Log(medianPriorityFeeStrategy.Exception.Message);
                yield break;
            }
            
            Debug.Log(medianPriorityFeeStrategy.Result.MaxFeePerGas);
            Debug.Log(medianPriorityFeeStrategy.Result.MaxPriorityFeePerGas);
            
            var fee = medianPriorityFeeStrategy.Result;

            yield return ethTransfer.TransferEther(receivingAddress, Amount, fee.MaxPriorityFeePerGas.Value, fee.MaxFeePerGas.Value);
            if (ethTransfer.Exception != null)
            {
                Debug.Log(ethTransfer.Exception.Message);
                yield break;
            }
        }

        if (feeStrategy == FeeStrategy.Legacy)
        {
            Debug.Log("Legacy mode");
            //I am forcing the legacy mode but also I am including the gas price
            ethTransfer.UseLegacyAsDefault = true;

            yield return ethTransfer.TransferEther(receivingAddress, Amount, GasPriceGwei);

            if (ethTransfer.Exception != null)
            {
                Debug.Log(ethTransfer.Exception.Message);
                yield break;
            }

        }

        TransactionHash = ethTransfer.Result;
        ResultTxnHash.text = TransactionHash;
        Debug.Log("Transfer transaction hash:" + TransactionHash);

        //create a poll to get the receipt when mined
        var transactionReceiptPolling = new TransactionReceiptPollingRequest(Url);
        //checking every 2 seconds for the receipt
        yield return transactionReceiptPolling.PollForReceipt(TransactionHash, 2);
        
        Debug.Log("Transaction mined");

        var balanceRequest = new EthGetBalanceUnityRequest(Url);
        yield return balanceRequest.SendRequest(receivingAddress, BlockParameter.CreateLatest());

        BalanceAddressTo = UnitConversion.Convert.FromWei(balanceRequest.Result.Value);
        ResultBalanceAddressTo.text = BalanceAddressTo.ToString();

        Debug.Log("Balance of account:" + BalanceAddressTo);
    }



    // Update is called once per frame
    void Update () {
		
	}

}

Smart contract Integration

This sample covers all the steps of smart contract integration using the ERC20 standard token.

Declare our smart contract definition

First step is to include our smart contract definition, this can be code generated using the vscode solidity extension or the console code generation tool.

//Deployment contract object definition
    public partial class EIP20Deployment : EIP20DeploymentBase
    {
        public EIP20Deployment() : base(BYTECODE) { }
        public EIP20Deployment(string byteCode) : base(byteCode) { }
    }



    public class EIP20DeploymentBase : ContractDeploymentMessage
    {
        public static string BYTECODE = "608060405234801561001057600080fd5b506040516107843803806107848339810160409081528151602080840151838501516060860151336000908152808552959095208490556002849055908501805193959094919391019161006991600391860190610096565b506004805460ff191660ff8416179055805161008c906005906020840190610096565b5050505050610131565b828054600181600116156101000203166002900490600052602060002090601f016020900481019282601f106100d757805160ff1916838001178555610104565b82800160010185558215610104579182015b828111156101045782518255916020019190600101906100e9565b50610110929150610114565b5090565b61012e91905b80821115610110576000815560010161011a565b90565b610644806101406000396000f3006080604052600436106100ae5763ffffffff7c010000000000000000000000000000000000000000000000000000000060003504166306fdde0381146100b3578063095ea7b31461013d57806318160ddd1461017557806323b872dd1461019c57806327e235e3146101c6578063313ce567146101e75780635c6581651461021257806370a082311461023957806395d89b411461025a578063a9059cbb1461026f578063dd62ed3e14610293575b600080fd5b3480156100bf57600080fd5b506100c86102ba565b6040805160208082528351818301528351919283929083019185019080838360005b838110156101025781810151838201526020016100ea565b50505050905090810190601f16801561012f5780820380516001836020036101000a031916815260200191505b509250505060405180910390f35b34801561014957600080fd5b50610161600160a060020a0360043516602435610348565b604080519115158252519081900360200190f35b34801561018157600080fd5b5061018a6103ae565b60408051918252519081900360200190f35b3480156101a857600080fd5b50610161600160a060020a03600435811690602435166044356103b4565b3480156101d257600080fd5b5061018a600160a060020a03600435166104b7565b3480156101f357600080fd5b506101fc6104c9565b6040805160ff9092168252519081900360200190f35b34801561021e57600080fd5b5061018a600160a060020a03600435811690602435166104d2565b34801561024557600080fd5b5061018a600160a060020a03600435166104ef565b34801561026657600080fd5b506100c861050a565b34801561027b57600080fd5b50610161600160a060020a0360043516602435610565565b34801561029f57600080fd5b5061018a600160a060020a03600435811690602435166105ed565b6003805460408051602060026001851615610100026000190190941693909304601f810184900484028201840190925281815292918301828280156103405780601f1061031557610100808354040283529160200191610340565b820191906000526020600020905b81548152906001019060200180831161032357829003601f168201915b505050505081565b336000818152600160209081526040808320600160a060020a038716808552908352818420869055815186815291519394909390927f8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b925928290030190a350600192915050565b60025481565b600160a060020a03831660008181526001602090815260408083203384528252808320549383529082905281205490919083118015906103f45750828110155b15156103ff57600080fd5b600160a060020a038085166000908152602081905260408082208054870190559187168152208054849003905560001981101561046157600160a060020a03851660009081526001602090815260408083203384529091529020805484900390555b83600160a060020a031685600160a060020a03167fddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef856040518082815260200191505060405180910390a3506001949350505050565b60006020819052908152604090205481565b60045460ff1681565b600160209081526000928352604080842090915290825290205481565b600160a060020a031660009081526020819052604090205490565b6005805460408051602060026001851615610100026000190190941693909304601f810184900484028201840190925281815292918301828280156103405780601f1061031557610100808354040283529160200191610340565b3360009081526020819052604081205482111561058157600080fd5b3360008181526020818152604080832080548790039055600160a060020a03871680845292819020805487019055805186815290519293927fddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef929181900390910190a350600192915050565b600160a060020a039182166000908152600160209081526040808320939094168252919091522054905600a165627a7a7230582084c618322109054a21a57e27075384a6172ab854e4b2c2d35062a964a6bf593f0029";

        public EIP20DeploymentBase() : base(BYTECODE) { }

        public EIP20DeploymentBase(string byteCode) : base(byteCode) { }

        [Parameter("uint256", "_initialAmount", 1)]

        public BigInteger InitialAmount { get; set; }

        [Parameter("string", "_tokenName", 2)]

        public string TokenName { get; set; }

        [Parameter("uint8", "_decimalUnits", 3)]

        public byte DecimalUnits { get; set; }

        [Parameter("string", "_tokenSymbol", 4)]

        public string TokenSymbol { get; set; }

    }



    [Function("transfer", "bool")]
    public class TransferFunctionBase : FunctionMessage
    {
        [Parameter("address", "_to", 1)]
        public string To { get; set; }
        [Parameter("uint256", "_value", 2)]
        public BigInteger Value { get; set; }
    }



    public partial class TransferFunction : TransferFunctionBase
    {
    }

    [Function("balanceOf", "uint256")]
    public class BalanceOfFunction : FunctionMessage
    {
        [Parameter("address", "_owner", 1)]
        public string Owner { get; set; }
    }

    [FunctionOutput]
    public class BalanceOfFunctionOutput : IFunctionOutputDTO
    {
        [Parameter("uint256", 1)]
        public int Balance { get; set; }
    }
    
    [Event("Transfer")]
    public class TransferEventDTOBase : IEventDTO
    {
        [Parameter("address", "_from", 1, true)]
        public virtual string From { get; set; }

        [Parameter("address", "_to", 2, true)]
        public virtual string To { get; set; }

        [Parameter("uint256", "_value", 3, false)]
        public virtual BigInteger Value { get; set; }
    }

    public partial class TransferEventDTO : TransferEventDTOBase
    {
        public static EventABI GetEventABI()
        {
            return EventExtensions.GetEventABI<TransferEventDTO>();
        }
    }

Contract deployment

To deploy a smart contract we create a TransactionSignedUnityRequest with our url and signing information. Creating a new EIP20Deployment contract definition we set the constructor parameters and send the transaction. Finally we we create TransactionReceiptPollingRequest to poll for the transaction receipt and retrieve the newly deployed contract address from the transaction receipt.

        var url = "http://localhost:8545";
        var privateKey = "0xb5b1870957d373ef0eeffecc6e4812c0fd08f554b37b233526acc331bf1544f7";
        var account = "0x12890d2cce102216644c59daE5baed380d84830c";
        //initialising the transaction request sender
        
        var transactionRequest = new TransactionSignedUnityRequest(url, privateKey, "YOURCHAINID");

        var deployContract = new EIP20Deployment()
        {
            InitialAmount = 10000,
            FromAddress = account,
            TokenName = "TST",
            TokenSymbol = "TST"
        };

        //deploy the contract
        yield return transactionRequest.SignAndSendDeploymentContractTransaction<EIP20DeploymentBase>(deployContract);

        if (transactionRequest.Exception != null)
        {
            Debug.Log(transactionRequest.Exception.Message);
            yield break;
        }

        var transactionHash = transactionRequest.Result;
        Debug.Log("Deployment transaction hash:" + transactionHash);

        //create a poll to get the receipt when mined
        var transactionReceiptPolling = new TransactionReceiptPollingRequest(url);

        //checking every 2 seconds for the receipt
        yield return transactionReceiptPolling.PollForReceipt(transactionHash, 2);

        var deploymentReceipt = transactionReceiptPolling.Result;

        Debug.Log("Deployment contract address:" + deploymentReceipt.ContractAddress);

Query smart contract

To Query a smart contract we need to create a new QueryUnityRequest providing the FunctionType and ReturnType. We then will yield the Query and the query result Result object will provide us the Ouput of the contract already decoded.

 //Query request using our acccount and the contracts address (no parameters needed and default values)
        var queryRequest = new QueryUnityRequest<BalanceOfFunction, BalanceOfFunctionOutput>(url, account);
        yield return queryRequest.Query(new BalanceOfFunction(){Owner = account}, deploymentReceipt.ContractAddress);

        //Getting the dto response already decoded
        var dtoResult = queryRequest.Result;
        Debug.Log(dtoResult.Balance);

Transfer transaction

To send a transaction to interact with a smart contract has similar steps to the deployment. We first create a TransactionSignedUnityRequest and our Function including any parameters, once the transaction is send we poll for the transaction receipt which will confirm the success of the transaction.

Using the transaction receipt we can decoded any logs / events for that transaction.

 var transactionTransferRequest = new TransactionSignedUnityRequest(url, privateKey, "YOURCHAINID");
        var newAddress = "0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe";


        var transactionMessage = new TransferFunction
        {
            FromAddress = account,
            To = newAddress,
            Value = 1000,
        };

        yield return transactionTransferRequest.SignAndSendTransaction(transactionMessage, deploymentReceipt.ContractAddress);
        var transactionTransferHash = transactionTransferRequest.Result;

        Debug.Log("Transfer txn hash:" + transactionHash);

        transactionReceiptPolling = new TransactionReceiptPollingRequest(url);
        yield return transactionReceiptPolling.PollForReceipt(transactionTransferHash, 2);
        var transferReceipt = transactionReceiptPolling.Result;

        var transferEvent = transferReceipt.DecodeAllEvents<TransferEventDTO>();
        Debug.Log("Transferd amount from event: " + transferEvent[0].Event.Value);

Logs and Events

To retrived the logs / events of a smart contract we use the EthGetLogsUnityRequest combined with a FilterInput specific to our Event. FilterInputs can be created using the EventDTO extension GetEventABI(). Once we have yield the request, we can decode all matching events using the Result.DecodeAllEvents, extension method.

        var getLogsRequest = new EthGetLogsUnityRequest(url);
        var eventTransfer = TransferEventDTO.GetEventABI();
        yield return getLogsRequest.SendRequest(eventTransfer.CreateFilterInput(deploymentReceipt.ContractAddress, account));
        var eventDecoded = getLogsRequest.Result.DecodeAllEvents<TransferEventDTO>();
        Debug.Log("Transferd amount from get logs event: " + eventDecoded[0].Event.Value);

Full sample

using System.Collections;
using System.Collections.Generic;
using System.Numerics;
using Nethereum.ABI.FunctionEncoding.Attributes;
using Nethereum.ABI.Model;
using Nethereum.Contracts;
using Nethereum.Contracts.CQS;
using Nethereum.Contracts.Extensions;
using Nethereum.JsonRpc.UnityClient;
using UnityEngine;

public class TokenDeployAndSendCoroutinesUnityWebRequest : MonoBehaviour {

    //Deployment contract object definition

    public partial class EIP20Deployment : EIP20DeploymentBase
    {
        public EIP20Deployment() : base(BYTECODE) { }

        public EIP20Deployment(string byteCode) : base(byteCode) { }
    }

    public class EIP20DeploymentBase : ContractDeploymentMessage
    {

        public static string BYTECODE = "608060405234801561001057600080fd5b506040516107843803806107848339810160409081528151602080840151838501516060860151336000908152808552959095208490556002849055908501805193959094919391019161006991600391860190610096565b506004805460ff191660ff8416179055805161008c906005906020840190610096565b5050505050610131565b828054600181600116156101000203166002900490600052602060002090601f016020900481019282601f106100d757805160ff1916838001178555610104565b82800160010185558215610104579182015b828111156101045782518255916020019190600101906100e9565b50610110929150610114565b5090565b61012e91905b80821115610110576000815560010161011a565b90565b610644806101406000396000f3006080604052600436106100ae5763ffffffff7c010000000000000000000000000000000000000000000000000000000060003504166306fdde0381146100b3578063095ea7b31461013d57806318160ddd1461017557806323b872dd1461019c57806327e235e3146101c6578063313ce567146101e75780635c6581651461021257806370a082311461023957806395d89b411461025a578063a9059cbb1461026f578063dd62ed3e14610293575b600080fd5b3480156100bf57600080fd5b506100c86102ba565b6040805160208082528351818301528351919283929083019185019080838360005b838110156101025781810151838201526020016100ea565b50505050905090810190601f16801561012f5780820380516001836020036101000a031916815260200191505b509250505060405180910390f35b34801561014957600080fd5b50610161600160a060020a0360043516602435610348565b604080519115158252519081900360200190f35b34801561018157600080fd5b5061018a6103ae565b60408051918252519081900360200190f35b3480156101a857600080fd5b50610161600160a060020a03600435811690602435166044356103b4565b3480156101d257600080fd5b5061018a600160a060020a03600435166104b7565b3480156101f357600080fd5b506101fc6104c9565b6040805160ff9092168252519081900360200190f35b34801561021e57600080fd5b5061018a600160a060020a03600435811690602435166104d2565b34801561024557600080fd5b5061018a600160a060020a03600435166104ef565b34801561026657600080fd5b506100c861050a565b34801561027b57600080fd5b50610161600160a060020a0360043516602435610565565b34801561029f57600080fd5b5061018a600160a060020a03600435811690602435166105ed565b6003805460408051602060026001851615610100026000190190941693909304601f810184900484028201840190925281815292918301828280156103405780601f1061031557610100808354040283529160200191610340565b820191906000526020600020905b81548152906001019060200180831161032357829003601f168201915b505050505081565b336000818152600160209081526040808320600160a060020a038716808552908352818420869055815186815291519394909390927f8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b925928290030190a350600192915050565b60025481565b600160a060020a03831660008181526001602090815260408083203384528252808320549383529082905281205490919083118015906103f45750828110155b15156103ff57600080fd5b600160a060020a038085166000908152602081905260408082208054870190559187168152208054849003905560001981101561046157600160a060020a03851660009081526001602090815260408083203384529091529020805484900390555b83600160a060020a031685600160a060020a03167fddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef856040518082815260200191505060405180910390a3506001949350505050565b60006020819052908152604090205481565b60045460ff1681565b600160209081526000928352604080842090915290825290205481565b600160a060020a031660009081526020819052604090205490565b6005805460408051602060026001851615610100026000190190941693909304601f810184900484028201840190925281815292918301828280156103405780601f1061031557610100808354040283529160200191610340565b3360009081526020819052604081205482111561058157600080fd5b3360008181526020818152604080832080548790039055600160a060020a03871680845292819020805487019055805186815290519293927fddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef929181900390910190a350600192915050565b600160a060020a039182166000908152600160209081526040808320939094168252919091522054905600a165627a7a7230582084c618322109054a21a57e27075384a6172ab854e4b2c2d35062a964a6bf593f0029";

        public EIP20DeploymentBase() : base(BYTECODE) { }

        public EIP20DeploymentBase(string byteCode) : base(byteCode) { }

        [Parameter("uint256", "_initialAmount", 1)]
        public BigInteger InitialAmount { get; set; }
        [Parameter("string", "_tokenName", 2)]
        public string TokenName { get; set; }
        [Parameter("uint8", "_decimalUnits", 3)]
        public byte DecimalUnits { get; set; }
        [Parameter("string", "_tokenSymbol", 4)]
        public string TokenSymbol { get; set; }

    }

    [Function("transfer", "bool")]
    public class TransferFunctionBase : FunctionMessage
    {
        [Parameter("address", "_to", 1)]
        public string To { get; set; }
        [Parameter("uint256", "_value", 2)]
        public BigInteger Value { get; set; }
    }

    public partial class TransferFunction : TransferFunctionBase
    {

    }

    [Function("balanceOf", "uint256")]
    public class BalanceOfFunction : FunctionMessage
    {
        [Parameter("address", "_owner", 1)]
        public string Owner { get; set; }
    }

    [FunctionOutput]
    public class BalanceOfFunctionOutput : IFunctionOutputDTO
    {
        [Parameter("uint256", 1)]
        public int Balance { get; set; }
    }

    [Event("Transfer")]
    public class TransferEventDTOBase : IEventDTO
    {

        [Parameter("address", "_from", 1, true)]
        public virtual string From { get; set; }
        [Parameter("address", "_to", 2, true)]
        public virtual string To { get; set; }
        [Parameter("uint256", "_value", 3, false)]
        public virtual BigInteger Value { get; set; }
    }

    public partial class TransferEventDTO : TransferEventDTOBase
    {
        public static EventABI GetEventABI()
        {
            return EventExtensions.GetEventABI<TransferEventDTO>();
        }
    }

    // Use this for initialization
    void Start () {

       StartCoroutine(DeployAndTransferToken());
    }


    //Sample of new features / requests
    public IEnumerator DeployAndTransferToken()
    {
        var url = "http://localhost:8545";
        var privateKey = "0xb5b1870957d373ef0eeffecc6e4812c0fd08f554b37b233526acc331bf1544f7";
        var account = "0x12890d2cce102216644c59daE5baed380d84830c";
        //initialising the transaction request sender
        var transactionRequest = new TransactionSignedUnityRequest(url, privateKey);


        var deployContract = new EIP20Deployment()
        {
            InitialAmount = 10000,
            FromAddress = account,
            TokenName = "TST",
            TokenSymbol = "TST"
        };

        //deploy the contract and True indicates we want to estimate the gas
        yield return transactionRequest.SignAndSendDeploymentContractTransaction<EIP20DeploymentBase>(deployContract);

        if (transactionRequest.Exception != null)
        {
            Debug.Log(transactionRequest.Exception.Message);
            yield break;
        }

        var transactionHash = transactionRequest.Result;

        Debug.Log("Deployment transaction hash:" + transactionHash);

        //create a poll to get the receipt when mined
        var transactionReceiptPolling = new TransactionReceiptPollingRequest(url);
        //checking every 2 seconds for the receipt
        yield return transactionReceiptPolling.PollForReceipt(transactionHash, 2);
        var deploymentReceipt = transactionReceiptPolling.Result;

        Debug.Log("Deployment contract address:" + deploymentReceipt.ContractAddress);

        //Query request using our acccount and the contracts address (no parameters needed and default values)
        var queryRequest = new QueryUnityRequest<BalanceOfFunction, BalanceOfFunctionOutput>(url, account);
        yield return queryRequest.Query(new BalanceOfFunction(){Owner = account}, deploymentReceipt.ContractAddress);

        //Getting the dto response already decoded
        var dtoResult = queryRequest.Result;
        Debug.Log(dtoResult.Balance);


        var transactionTransferRequest = new TransactionSignedUnityRequest(url, privateKey);

        var newAddress = "0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe";

        var transactionMessage = new TransferFunction
        {
            FromAddress = account,
            To = newAddress,
            Value = 1000,

        };

        yield return transactionTransferRequest.SignAndSendTransaction(transactionMessage, deploymentReceipt.ContractAddress);

        var transactionTransferHash = transactionTransferRequest.Result;

        Debug.Log("Transfer txn hash:" + transactionHash);

        transactionReceiptPolling = new TransactionReceiptPollingRequest(url);
        yield return transactionReceiptPolling.PollForReceipt(transactionTransferHash, 2);
        var transferReceipt = transactionReceiptPolling.Result;

        var transferEvent = transferReceipt.DecodeAllEvents<TransferEventDTO>();
        Debug.Log("Transferd amount from event: " + transferEvent[0].Event.Value);

        var getLogsRequest = new EthGetLogsUnityRequest(url);

        var eventTransfer = TransferEventDTO.GetEventABI();
        yield return getLogsRequest.SendRequest(eventTransfer.CreateFilterInput(deploymentReceipt.ContractAddress, account));

        var eventDecoded = getLogsRequest.Result.DecodeAllEvents<TransferEventDTO>();

        Debug.Log("Transferd amount from get logs event: " + eventDecoded[0].Event.Value);
    }
  
}

Targetting multiple platforms Desktop / Native / Browser

Using the IUnityRpcRequestClientFactory and the IContractTransactionUnityRequest you can change the way your transactions are signed reusing all your code.

In this example we are either signing or querying the chain using our provided url / private key / chainId when we are in a desktop / mobile / console environment or if we are in a browser we use Metamask to sign our transactions.

    public IUnityRpcRequestClientFactory GetUnityRpcRequestClientFactory()
    {
        if (IsWebGL())
        {
            if (MetamaskInterop.IsMetamaskAvailable())
            {
                return new MetamaskRequestRpcClientFactory(_selectedAccountAddress, null, 1000);
            }
            else
            {
                // DisplayError("Metamask is not available, please install it");
                return null;
            }
        }
        else
        {
            Url = InputUrl.text;
            
            return new UnityWebRequestRpcClientFactory(Url);
        }
    }

    public IContractTransactionUnityRequest GetTransactionUnityRequest()
    {
        if (IsWebGL())
        {
            if (MetamaskInterop.IsMetamaskAvailable())
            {
                return new MetamaskTransactionUnityRequest(_selectedAccountAddress, GetUnityRpcRequestClientFactory());
            }
            else
            {
                DisplayError("Metamask is not available, please install it");
                return null;
            }
        }
        else
        {
            Url = InputUrl.text;
            PrivateKey = InputPrivateKey.text;
            ChainId = BigInteger.Parse(InputChainId.text);
            return new TransactionSignedUnityRequest(Url, PrivateKey, ChainId);
        }
    }	

Full Sample

using System.Collections;
using UnityEngine;
using UnityEngine.UI;
using Nethereum.Unity.Rpc;
using Nethereum.RPC.Eth.DTOs;
using Nethereum.Util;
using Debug = UnityEngine.Debug;
#if UNITY_WEBGL
  using Nethereum.Unity.Metamask;
#endif
using Nethereum.Unity.FeeSuggestions;
using Nethereum.Unity.Contracts;
using System.Numerics;
using Nethereum.Hex.HexTypes;

public class MultiplatformTransfer : MonoBehaviour
{
    public string Url = "http://localhost:8545";
    public BigInteger ChainId = 444444444500;
    public string PrivateKey = "0xb5b1870957d373ef0eeffecc6e4812c0fd08f554b37b233526acc331bf1544f7";
    public string AddressTo = "0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe";
    private string _selectedAccountAddress; 
    private bool _isMetamaskInitialised = false;
    public decimal Amount = 1.1m;
    public string TransactionHash = "";
    public decimal BalanceAddressTo = 0m;

    public InputField InputUrl;
    public InputField InputChainId;
    public InputField InputPrivateKey;
    public InputField InputAddressTo;
    public InputField InputAmount;

    public InputField ResultBalanceAddressTo;
    public InputField ResultTxnHash;
    public Button BtnMetamaskConnect;
    public Text  LblError;


    void Start()
    {
        if (IsWebGL())
        {
            InputUrl.enabled = false;
            InputPrivateKey.enabled = false;
            InputChainId.enabled = false;

        }
        else
        {
            InputUrl.text = Url;
            InputPrivateKey.text = PrivateKey;
            InputChainId.text = ChainId.ToString();
            BtnMetamaskConnect.enabled = false;
        }

        InputAddressTo.text = AddressTo;
        InputAmount.text = Amount.ToString();

    }

    public bool IsWebGL()
    {
#if UNITY_WEBGL
      return true;
#else
      return false;
#endif
    }

    public void TransferRequest()
    {
        StartCoroutine(TransferEther());
    }


    public IEnumerator TransferEther()
    {
      
        AddressTo = InputAddressTo.text;
        Amount = System.Decimal.Parse(InputAmount.text);

        //initialising the transaction request sender
        var ethTransfer = new EthTransferUnityRequest(GetTransactionUnityRequest());

        var receivingAddress = AddressTo;

        var timePreferenceFeeSuggestion = new TimePreferenceFeeSuggestionUnityRequestStrategy(Url);

        yield return timePreferenceFeeSuggestion.SuggestFees();

        if (timePreferenceFeeSuggestion.Exception != null)
        {
            Debug.Log(timePreferenceFeeSuggestion.Exception.Message);
            yield break;
        }

        //lets get the first one so it is higher priority
        Debug.Log(timePreferenceFeeSuggestion.Result.Length);
        if (timePreferenceFeeSuggestion.Result.Length > 0)
        {
            Debug.Log(timePreferenceFeeSuggestion.Result[0].MaxFeePerGas);
            Debug.Log(timePreferenceFeeSuggestion.Result[0].MaxPriorityFeePerGas);
        }
        var fee = timePreferenceFeeSuggestion.Result[0];

        yield return ethTransfer.TransferEther(receivingAddress, Amount, fee.MaxPriorityFeePerGas.Value, fee.MaxFeePerGas.Value);
        if (ethTransfer.Exception != null)
        {
            Debug.Log("Error transferring Ether using Time Preference Fee Estimation Strategy: " + ethTransfer.Exception.Message);
            yield break;
        }

        TransactionHash = ethTransfer.Result;
        ResultTxnHash.text = TransactionHash;
        Debug.Log("Transfer transaction hash:" + TransactionHash);

        //create a poll to get the receipt when mined
        var transactionReceiptPolling = new TransactionReceiptPollingRequest(Url);
        //checking every 2 seconds for the receipt
        yield return transactionReceiptPolling.PollForReceipt(TransactionHash, 2);

        Debug.Log("Transaction mined");

        var balanceRequest = new EthGetBalanceUnityRequest(Url);
        yield return balanceRequest.SendRequest(receivingAddress, BlockParameter.CreateLatest());

        BalanceAddressTo = UnitConversion.Convert.FromWei(balanceRequest.Result.Value);
        ResultBalanceAddressTo.text = BalanceAddressTo.ToString();

        Debug.Log("Balance of account:" + BalanceAddressTo);
    }

    public void DisplayError(string errorMessage)
    {
        LblError.text = errorMessage;
    }

    public void MetamaskConnect()
    {
#if UNITY_WEBGL
        if (IsWebGL())
        {
            if (MetamaskInterop.IsMetamaskAvailable())
            {
                MetamaskInterop.EnableEthereum(gameObject.name, nameof(EthereumEnabled), nameof(DisplayError));
            }
            else
            {
                DisplayError("Metamask is not available, please install it");
            }
        }
#endif

    }

    public void EthereumEnabled(string addressSelected)
    {
#if UNITY_WEBGL
        if (IsWebGL())
        {
            if (!_isMetamaskInitialised)
            {
                MetamaskInterop.EthereumInit(gameObject.name, nameof(NewAccountSelected), nameof(ChainChanged));
                MetamaskInterop.GetChainId(gameObject.name, nameof(ChainChanged), nameof(DisplayError));
                _isMetamaskInitialised = true;
            }
            NewAccountSelected(addressSelected);
        }
#endif
    }

    public void ChainChanged(string chainId)
    {
        print(chainId);
        ChainId = new HexBigInteger(chainId).Value;
        InputChainId.text = ChainId.ToString();
    }

    public void NewAccountSelected(string accountAddress)
    {
        _selectedAccountAddress = accountAddress;
    }


    public IUnityRpcRequestClientFactory GetUnityRpcRequestClientFactory()
    {
#if UNITY_WEBGL
        if (IsWebGL())
        {
            if (MetamaskInterop.IsMetamaskAvailable())
            {
                return new MetamaskRequestRpcClientFactory(_selectedAccountAddress, null, 1000);
            }
            else
            {
                // DisplayError("Metamask is not available, please install it");
                return null;
            }
        }
        else
        {
#endif
            Url = InputUrl.text;
            return new UnityWebRequestRpcClientFactory(Url);
#if UNITY_WEBGL
        }
#endif
    }

    public IContractTransactionUnityRequest GetTransactionUnityRequest()
    {
#if UNITY_WEBGL

        if (IsWebGL())
        {
            if (MetamaskInterop.IsMetamaskAvailable())
            {
                return new MetamaskTransactionUnityRequest(_selectedAccountAddress, GetUnityRpcRequestClientFactory());
            }
            else
            {
                DisplayError("Metamask is not available, please install it");
                return null;
            }
        }
        else
        {
#endif
            Url = InputUrl.text;
            PrivateKey = InputPrivateKey.text;
            ChainId = BigInteger.Parse(InputChainId.text);
            return new TransactionSignedUnityRequest(Url, PrivateKey, ChainId);
#if UNITY_WEBGL
        }
#endif
    }

}
	

Credits

The example includes Unity TabsUI component https://www.youtube.com/watch?v=p9kRAdh_3Ks, source code https://github.com/herbou/Unity_TabsUI by Herbou