GetMethod invocation doesn't work

Code (CSharp):

1. using System;
2. using System.Collections;
3. using System.Collections.Generic;
4. using System.Reflection;
5. using UnityEngine;
6.  
7.  
8. public class testing : MonoBehaviour
9. {
10.  
11.     public int sqr(params object[] data)
12.     {
13.         int num = (int)data[0];
14.         return num * num;
15.     }
16.  
17.  
18.     void Start()
19.     {
20.         Type t = this.GetType();                
21.         MethodInfo mi = t.GetMethod("sqr");
22.         Debug.Log(mi);                  // Int32 sqr(System.Object[])
23.  
24.         int result = (int)mi.Invoke(this, new object[] { 4 });
25.         // ArgumentException: Object of type 'System.Int32' cannot be converted to type 'System.Object[]'.
26.  
27.         Debug.Log(result);
28.     }
29.  
30.  
31. }

I could invoke it directly but the question is not how I do it, but why this approach doesn't work. I'm trying to save a function into a variable and then execute it afterwards. I know about alternate solutions like Action, delegate and Func, but I'm interested in getting this to work with this approach.

 

Found it! I think you have to double-wrap your input. Check the docs here:

https://docs.microsoft.com/en-us/do...ction.methodbase.invoke?view=netframework-4.8

I quote:

"This is an array of objects with the same number, order, and type as the parameters of the method or constructor to be invoked."

I tried this double-wrapping code and it worked:

Code (csharp):

1.         var rawargs = new object[] { 4};
2.         var packed = new object[] { rawargs};
3.         var result = (int)mi.Invoke( this, packed);
4.         Debug.Log(result);

Basically the outer array is a single entry array, the first entry being the array of args passed into the call.

This lets that first entry match an array of object[] for your first argument in your sqr() call.

Whew. Now I'm going to go reflect on that a bit...

 

ha ha . . .

Anyways, thank you very much. That solves insane amount of problems.