System.IO.FileNotFoundException: Could not load file or assembly 'System.Net.Http, Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.

[Brian]

Version Information

Software	Version(s)
NuGet Package	6.0,1
.NET Core?	n
.NET Full Framework?	4.8
Windows OS?	Win 10 Version 1909
Linux OS?	n
Visual Studio?	2019 Enterprise 16.8.4

What is the expected behavior?

That the following code works:

            var result = new ApiKeyConfig
            {
                ApiKey = parms.ApiKey,
                ApiSecret = parms.ApiSecret
            };

What is the actual behavior?

Instead, it throws a FileNotFound exception:

System.IO.FileNotFoundException: Could not load file or assembly 'System.Net.Http, Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified. at Flurl.Http.FlurlClient..ctor(String baseUrl)

I am using Flurl 3.0.1 and Flurl.Http version 3.0.1 NuGet packages.

Any possible solutions?

Tried doing a Update-Package on my Solution in the Package Manager Console and deleting bin and obj folders and doing a Restart of Visual Studio.

How do you reproduce the issue?

Just by running the code.

However, the following Unit Test passes:

using Coinbase;
using NUnit.Framework;

namespace MyTests
{
    [TestFixture]
    public class MyTestFixture
    {
        [Test]
        public void Test_Constructing_ApiKeyConfig_DoesNotThrowException()
        {
            ApiKeyConfig config = null;

            Assert.DoesNotThrow(() => config = new ApiKeyConfig
                {
                    ApiKey = "******",     // shhhh, it's a secret!
                    ApiSecret = "*********"     // shhhh, it's a secret!
                }
            );

            Assert.IsNotNull(config);
        }
    }
}

BTW - the asterisks in the listing above are just for security purposes. I am passing a valid API key and secret here.

Do you have a unit test that can demonstrate the bug?

No. Like I said earlier, I am baffled by this. I know this is around where the error is occurring because I've done logging down to this point.,

Can you identify the location in the source code where the problem exists?

Basically, but I get an error in my library source code and I do not receive an error during unit testing.

If the bug is confirmed, would you be willing to submit a PR?

Yes, absolutely. One concern I would have is, there seem to be pre- and post-build events configured to automatically push changes to GitHub on build. If I were to fork, I'd also need guidance on how to properly disable such code for testing purposes. The extensions or build events appear to push directly to your master, even from a fork.

[Brian]

Just a quick update, I did a fork of this project and then cloned it to my local machine. Then, out of an abundance of caution, before building, I deleted the .git folder from the cloned repo to ensure that any remotes are also purged. This way there is very little chance of a screw up.

[Brian Chavez]

Hi @astrohart,

Thanks for posting the issue. I want to say it seems like a binding issue. As you might know, the part of the CLR that is responsible for loading assemblies is called the Fusion loader. When the runtime needs to load a Type; Fusion is invoked to find the DLL responsible for that Type.

What it sounds like to me is; something in your project has a hard reference to a .NET framework assembly: System.Net.Http, Version=4.2.0.0 at this exact version.

Some things to check:

• Delete all **/bin, **/obj, **/debug, **/release folders and rebuild your project.
• Once you've recompiled, look for System.Net.Http.dll; do you have it in the bin folder? What version is it?
• If the version is not 4.2.0.0; grep all *.csproj files and look at the package reference details to System.Net.Http. Is there any build XML that instructs MSBUILD to use this "specific" version?
• Check your local GAC for what version you have installed.
• Try using this Fusion++ tool https://github.com/awaescher/Fusion to get more diagnostics on the DLL loading process.
• Or, use FUSLOGVW.exe in the .NET Full Framework SDK: https://stackoverflow.com/questions/1674279/cant-locate-fuslogvw-exe-on-my-machine
  • More on FUSLOGVW here: https://www.loganconsulting.com/blog/using-fuslogvw-exe-to-find-missing-referenced-dlls-in-microsoft-dynamics-ax-2012/
• With Fusion logging bindings to disk, it should show you what version you have loaded / what version failed to load / what part of code requested the load. With more diagnostic information from Fusion you should be able to pinpoint what code (and project) is requesting the specific version of System.Net.Http to load.

Let me know what you find.

Thanks,
Brian