Passing array references by value and by reference. - CSharp Custom Type

CSharp examples for Custom Type:Method Parameter

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Description

Passing array references by value and by reference.

Demo Code



using System;/*w w  w.  j  a v a  2 s  . c  om*/

class MainClass
{
   static void Main()
   {
      int[] firstArray = { 1, 2, 3 };

      int[] firstArrayCopy = firstArray;

      Console.WriteLine("Test passing firstArray reference by value");

      foreach (var element in firstArray)
      {
         Console.Write($"{element} ");
      }

      // pass variable firstArray by value to FirstDouble
      FirstDouble(firstArray);

      Console.Write("\nContents of firstArray after calling FirstDouble\n\t");

      foreach (var element in firstArray)
      {
         Console.Write($"{element} ");
      }

      if (firstArray == firstArrayCopy)
      {
         Console.WriteLine("\n\nThe references refer to the same array");
      }
      else
      {
         Console.WriteLine("\n\nThe references refer to different arrays");
      }

      int[] secondArray = { 1, 2, 3 };

      int[] secondArrayCopy = secondArray;

      Console.WriteLine("\nTest passing secondArray reference by reference");
      Console.Write("Contents of secondArray before calling SecondDouble:\n\t");

      foreach (var element in secondArray)
      {
         Console.Write($"{element} ");
      }

      SecondDouble(ref secondArray);

      Console.Write("\nContents of secondArray after calling SecondDouble:\n\t");

      foreach (var element in secondArray)
      {
         Console.Write($"{element} ");
      }

      if (secondArray == secondArrayCopy)
      {
         Console.WriteLine("\n\nThe references refer to the same array");
      }
      else
      {
         Console.WriteLine("\n\nThe references refer to different arrays");
      }
   }

   static void FirstDouble(int[] array)
   {
      for (var i = 0; i < array.Length; ++i)
      {
         array[i] *= 2;
      }
      array = new int[] { 11, 12, 13 };
   }

   static void SecondDouble(ref int[] array)
   {
      for (var i = 0; i < array.Length; ++i)
      {
         array[i] *= 2;
      }

      array = new int[] { 11, 12, 13 };
   }
}

Result


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