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Got it working, thanks!

This is what I have (it throws a NullReferenceException):

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if (float.Parse(codes[i].operand.ToString()) == -10)
{
     codes[i].operand = -5;

     UnityEngine.Debug.Log("Index " + i + ": " + codes[i].operand.ToString());
}
else if (float.Parse(codes[i].operand.ToString()) == 10)
{
     codes[i].operand = 5;

     UnityEngine.Debug.Log("Index " + i + ": " + codes[i].operand.ToString());
}


Okay, I've managed to figure out something that works for finding and replacing methods in operands:

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static IEnumerable<CodeInstruction> Transpiler(IEnumerable<CodeInstruction> instructions)
        {
            var codes = new List<CodeInstruction>(instructions);

            for (var i = 0; i < codes.Count; i++)
            {
                if (codes[i].operand == typeof(UnityEngine.Input).GetMethod("GetKeyDown", new[] { typeof(KeyCode) }))
                {
                    codes[i].operand = typeof(UnityEngine.Input).GetMethod("GetKey", new[] { typeof(KeyCode) });
                }
            }

            return codes.AsEnumerable();
        }

Now I have a different question, though: how do I set an operand to something that's not a method? I have an instruction whose operand is a float, but trying to set it to a different float causes a NullReferenceException. How do I get around this?

The context is that it's calling a method, like so:

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call      bool [UnityEngine]UnityEngine.Input::GetKeyDown(valuetype [UnityEngine]UnityEngine.KeyCode) I'm attempting to follow the example on the Harmony wiki, which checks the value of an instruction's operand using

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code[i].operand as String Unfortunately, that returns null for me. I tried doing

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code[i].operand = "method I want to call"; but that caused the game to crash.

Hi, how would one go about setting an instruction's operand? I'm trying to write a transpiler that changes the operands of certain instructions, but I'm not sure how to actually go about doing that. I've tried setting them to a string, but that ends in a crash. Also, trying to get the operand as a string using "codes.operand as String" returns null for some reason.