Bind chain with different return type

[Ancient Mariner]

Hello good people

I have a seemingly simple scenario that I can't seem to find an easy answer for. Consider the following

public static Result<decimal, Error> GetSomething(decimal? example) =>  
	GetGivenOrDefault(example)  
	.Bind(DoSomething)  
	.Bind(DoSomethingAndReturnTheThingOrError);  

The implementation is irrelevant but the signatures would be:

public static Result<decimal> GetGivenOrDefault(decimal? example)   
public static Result<decimal> DoSomething(decimal example)  
public static Result<decimal, Error> DoSomethingAndReturnTheThingOrError(decimal example)  

The intermediate results should be Result<decimal> only the final function should return Result<decimal, Error>

The compiler complains DoSomethingAndReturnTheThingOrError has the wrong return type. If I change all signatures to Result<decimal, Error> of course it's all fine but I don't want to have to do this unless really necessary.

I have tried multiple things with Map, Match and several other methods, all to no avail. It must be a common enough scenario, what am I missing here? Many thanks.

[rutkowskit]

You should provide error mapping from "string" to "Error".
Something like this:

public static Result<decimal, Error> GetSomething(decimal? example) =>
    GetGivenOrDefault(example)
    .Bind(DoSomething)
    .MapError(error => new Error(error))
    .Bind(DoSomethingAndReturnTheThingOrError);

[Ancient Mariner]

I knew it would be simple. That worked, thanks very much.