Variable number of parameters in method (function)

Variable number of parameters in method:

Use params in declaration, use comma-separated list or array when calling.

    // source: C# Language Specification. 10.5.1.4 Parameter arrays

    // http://msdn.microsoft.com/en-us/library/aa645765(VS.71).aspx

class Test

{

    // test 1

    static void ParamCount(params int[] args)

    {

        Console.Write("Array contains {0} elements:", args.Length);

        foreach (int i in args)

            Console.Write(" {0}", i);

        Console.WriteLine();

    }

    static void RunTest1()

    {

        int[] arr = { 1, 2, 3 };

        ParamCount(arr);

        ParamCount(10, 20, 30, 40);

        ParamCount();

    }

    // test 2

   static void F(params object[] args) {

      foreach (object o in args) {

         Console.Write(o.GetType().FullName);

         Console.Write(" ");

      }

      Console.WriteLine();

   }

   static void RunTest2() {

      object[] a = {1, "Hello", 123.456};

      object o = a;

      F(a);             // System.Int32 System.String System.Double

      F((object)a);     // System.Object[]

      F(o);             // System.Object[]

      F((object[])o);   // System.Int32 System.String System.Double

   }

}

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