C# Out Parameter

In this chapter you will learn:
  • What is Output parameter in C sharp?
  • What is the advantage of Out parameter?
  • How to use Out parameter in C# programming?

C# out parameter is such type of parameter that is declared with out keyword. It is the same as reference parameter, that doesn’t create memory allocation.

Why use out parameter in C#?

Usually, a method returns value with return keyword. Unfortunately, a return modifier can return only one value at a time. Sometime, your C# program required to return multiple values from a single method. In this situation, you need such type of function that can produce multiple output result from a single function. The output parameter C# lets your program to return multiple values.

 

Programming examples of out parameter C#

  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Text;
  5.  
  6. namespace out_parameter
  7. {
  8.     class Program
  9.     {
  10.         //Accept two input parameter and returns two out value
  11.         public static void rect(int len, int width, out int area, out int perimeter)
  12.         {
  13.             area = len * width;
  14.             perimeter = 2 * (len + width);
  15.         }
  16.         static void Main(string[] args)
  17.         {
  18.             int area, perimeter;
  19.             // passing two parameter and getting two returning value
  20.             Program.rect(5, 4, out area, out perimeter);
  21.             Console.WriteLine("Area of Rectangle is {0}\t", area);
  22.             Console.WriteLine("Perimeter of Rectangle is {0}\t", perimeter);
  23.             Console.ReadLine();
  24.         }
  25.     }
  26. }

Output

Area of Rectangle is 20

Perimeter of Rectangle is 18
__

In the preceding example, we created a method that accepts two input parameter and returns two out value.

Summary

In this chapter you learned about what is out parameter and how to use out parameter in C# programming. In next chapter you will learn about Command Line Argument in C#.

 

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