Is there a way to create a delegate to get and set values for a FieldInfo?

Question

For properties there are GetGetMethod and GetSetMethod so that I can do:

Getter = (Func)Delegate.CreateDelegate(typeof(         


        

Answer 1

ref return restriction in DynamicMethod seems to be gone at least on v4.0.30319.

Modified this answer by Glenn Slayden with info from microsoft docs:

using System;
using System.Reflection;
using System.Reflection.Emit;

namespace ConsoleApp {
    public class MyClass {
        private int privateInt = 6;
    }

    internal static class Program {
        private delegate ref TReturn OneParameter(TParameter0 p0);

        private static void Main() {
            var myClass = new MyClass();

            var method = new DynamicMethod(
                "methodName",
                typeof(int).MakeByRefType(), // <- MakeByRefType() here
                new[] {typeof(MyClass)}, 
                typeof(MyClass), 
                true); // skip visibility


            const BindingFlags bindings = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic;

            var il = method.GetILGenerator();
            il.Emit(OpCodes.Ldarg_0);
            il.Emit(OpCodes.Ldflda, typeof(MyClass).GetField("privateInt", bindings));
            il.Emit(OpCodes.Ret);

            var getPrivateInt = (OneParameter) method.CreateDelegate(typeof(OneParameter));

            Console.WriteLine(typeof(string).Assembly.ImageRuntimeVersion);
            Console.WriteLine(getPrivateInt(myClass));
        }
    }
}

Outputs:

6