如何强制.NET（C＃）使用方法的非泛型重载？

Question

There's a method in the .NET Framework that has both generic and a non-generic version/overload. I want to force the compiler to generate my code using the non-generic version even if it can resolve the generic type at build time.

The specific method I want to use is Marshal::GetFunctionPointerForDelegate which, as of .NET 4.5.1, has a generic overload. I want to use the original one (non-generic).

Also, if you could provide the solution (if any) in C++/CLI, it'd be much appreciated.

UPDATE: There reason for this is that, if my program is ran in a computer that does not have .NET 4.5.1, my program will crash.

Answer 1

It should be clear from the source code snippet posted by @elgonzo that the generic version is calling the non-generic version, otherwise you would have infinite recursion.

Therefore, you too can call the non-generic version. The trick is making the non-generic version a perfect match.

C#:

Marshal.GetFunctionPointerForDelegate( (Delegate)(object) mydel );

C++/CLI:

Marshal::GetFunctionPointerForDelegate( dynamic_cast<Delegate^>(safe_cast<Object^>(mydel)) );

Answer 2

It does not really matter whether you use the generic or the non-generic variant of the Marshall.GetFunctionPointerForDelegate method.

The only thing Marshall.GetFunctionPointerForDelegate<TDelegate>(...) does is calling the non-generic Marshal.GetFunctionPointerForDelegate(...) method.

As can be seen in the .NET framework reference source code , the implementation of GetFunctionPointerForDelegate<TDelegate> is just:

public static IntPtr GetFunctionPointerForDelegate<TDelegate>(TDelegate d)
{
    return GetFunctionPointerForDelegate((Delegate)(object)d);
}

Regarding your update

UPDATE: There reason for this is that, if my program is ran in a computer that does not > have .NET 4.5.1, my program will crash.

Set the target framework of your project to a .NET version prior to 4.5.1 (for example, if your project is required to run on .NET 3.5, then set the target framework of your project to .NET 3.5.)