Csharp/C Sharp/Generics/Generic Method

A prototypical generic method

using System;
public class Starter{
    public static void Main(){
       MethodA<int>(20);
    }
    public static void MethodA<T>(T param) {
       Console.WriteLine(param.GetType().ToString());
    }
}

Demonstrate a generic method

using System;
class ArrayUtils {
  public static bool copyInsert<T>(T e, int idx, T[] src, T[] target) {
    if(target.Length < src.Length+1)
      return false;
    for(int i=0, j=0; i < src.Length; i++, j++) {
      if(i == idx) {
        target[j] = e;
        j++;
      }
      target[j] = src[i];
    }
    return true;
  }
}
class Test {
  public static void Main() {
    int[] nums = { 1, 2, 3 };
    int[] nums2 = new int[4];
    Console.Write("Contents of nums: ");
    foreach(int x in nums)
      Console.Write(x + " ");
    Console.WriteLine();
    ArrayUtils.copyInsert(99, 2, nums, nums2);
    Console.Write("Contents of nums2: ");
    foreach(int x in nums2)
      Console.Write(x + " ");
    Console.WriteLine();
    string[] strs = { "Generics", "are", "powerful."};
    string[] strs2 = new string[4];
    Console.Write("Contents of strs: ");
    foreach(string s in strs)
      Console.Write(s + " ");
    Console.WriteLine();
    ArrayUtils.copyInsert("in C#", 1, strs, strs2);
    Console.Write("Contents of strs2: ");
    foreach(string s in strs2)
      Console.Write(s + " ");
  }
}

Generic methods can overload nongeneric methods

using System;
public class Starter{
        public static void Main(){
            MethodA(5);
            MethodA(5.0);
        }
        public static void MethodA<T>(T arg) {
            Console.WriteLine("ZClass.MethodA(T arg)");
        }
        public static void MethodA(int arg) {
            Console.WriteLine("ZClass.MethodA(int arg)");
        }
        public static void MethodA() {
            Console.WriteLine("ZClass.MethodA()");
        }
}

This is a prototypical generic method:

 
using System;

public class Starter {
    public static void Main() {
        MyClass.MethodA<int>(20);
    }
}
public class MyClass {
    public static void MethodA<T>(T param) {
        Console.WriteLine(param.GetType().ToString());
    }
}