c# - Getting a "Common Language Runtime detected an invalid program." error when trying to map ReadUnaligned using DynamicMethod and ILGenerator

Question

I'm trying to map the IL code for ASP.CORE method ReadUnaligned as defined here in .NET Frameword using DynamicMethod following this example.

When trying to run the code, I get the "Common Language Runtime detected an invalid program." error.

My code:

private delegate T ReadUnalignedInvoker<T>(ref byte input);

private delegate TReturn OneParameter<TReturn, TParameter0>(TParameter0 p0);

public static T ReadUnaligned<T, U>(U source)
{
    Type[] methodArgsTypes = { typeof(U) };

    var dm = new DynamicMethod("ReadUnaligned", typeof(T), methodArgsTypes, typeof(SizeHelper).Module);
    ILGenerator il = dm.GetILGenerator();

    il.Emit(OpCodes.Ldarg_0);
    il.Emit(OpCodes.Unaligned, (byte)0x1);
    il.Emit(OpCodes.Ldobj);
    il.Emit(OpCodes.Ret);

    OneParameter<T, U> invoker = (OneParameter<T, U>)dm.CreateDelegate(typeof(OneParameter<T, U>));

    return invoker(source);
    }

The call to the method is:

var buffer = new byte[Unsafe.SizeOf<TStructure>()];

ReadProcessMemory(_processHandle, baseAddress, ref buffer[0], buffer.Length, out var numberOfBytesRead);

ReadUnaligned<TStructure, byte>(buffer[0]);

Where ReadProcessMemory is taken from kernel32.dll

[DllImport("kernel32.dll", SetLastError = true)]
internal static extern bool ReadProcessMemory(SafeProcessHandle processHandle, IntPtr baseAddress, ref byte buffer, int bufferSize, out int numberOfBytesRead);

Any idea what I'm doing wrong?

标签： c#dynamicmethodilgenerator