CODEWITHSUNDEEP
c#cililgenerator
metafood
metafood

Reputation: 31

Can I use OpCodes.Ldsfld without using FieldInfo?

I want to avoid using GetType and GetField. Can I just use a string with Ldsfld? I have included a mock-up of what I'm trying to accomplish below. As you can see I'm new to IL Generation - I'm trying to remove some of the cost the cost of reflection in my application. 

using System;
using System.Reflection.Emit;

namespace ConsoleApplication10
{
    static class Program
    {
        public static string TextBox1 = "Hello World!";

        static void Main(string[] args)
        {
            var dm = new DynamicMethod("My_method",
                typeof(string), null, true);

            var il = dm.GetILGenerator();
            il.Emit(OpCodes.Ldsfld, "string ConsoleApplication10.Program::TextBox1");
            il.Emit(OpCodes.Ret);
            var func = (Func<string>)dm.CreateDelegate(typeof(Func<string>));
            var s = func();

            Console.WriteLine(s);
        }
    }
}

Upvotes: 2

Views: 473

Answers (1)

svick
svick

Reputation: 245028

No, you can't, the documentation for OpCodes.Ldsfld says:

The following Emit method overload can use the ldsfld opcode:

  • ILGenerator.Emit(OpCode, FieldInfo)

And to get FieldInfo if you know the name of the field, you need to use reflection.

Upvotes: 2

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