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  1. using System;
  2. using System.Reflection;
  3.  
  4. public class Test
  5. {        
  6. 	delegate T Param<T>(params object[] args);
  7.     static Param<T> skipArg<T>(Type type, string method, int ind, object value, Type[] types = null)
  8.     {
  9.         MethodInfo mi;
  10.         if (types == null) mi = type.GetMethod(method);
  11.         else mi = type.GetMethod(method, types);
  12.         return delegate (object[] _args)
  13.         {
  14.             int len = _args.Length;
  15.             object[] args = new object[len + 1];
  16.             Array.Copy(_args, 0, args, 0, ind);
  17.             Array.Copy(_args, ind, args, 1 + ind, len - ind);
  18.             args[ind] = value;
  19.             return (T)mi.Invoke(null, args);
  20.         };
  21.     }
  22.  
  23.     static void Main()
  24.     {
  25.         Param<double>
  26.             pow2_ = skipArg<double>(typeof(Math), "Pow", 0, 2),
  27.             pow_2 = skipArg<double>(typeof(Math), "Pow", 1, 2);
  28.         var hw = skipArg<int?>(typeof(Console), "WriteLine", 0, "Hellow world!", new Type[] { typeof(string) });
  29.         hw(); hw(); hw();
  30.         Console.WriteLine("2 ^ 3 = {0}", pow2_(3)); // 2 ^ 3 = 8
  31.         Console.WriteLine("3 ^ 2 = {0}", pow_2(3)); // 3 ^ 2 = 9
  32.     }
  33. }
Success #stdin #stdout 0s 131520KB
comments (?)
stdin
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Standard input is empty
stdout
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Hellow world!
Hellow world!
Hellow world!
2 ^ 3 = 8
3 ^ 2 = 9
https://ideone.com/WiUFJi
language:
C# (gmcs 5.20.1)
created:
7 years ago
visibility:
public

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