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C# | Params
  • Difficulty Level : Easy
  • Last Updated : 19 Jan, 2019

Params is an important keyword in C#. It is used as a parameter which can take the variable number of arguments.

Important Point About Params Keyword :

  • It is useful when programmer don’t have any prior knowledge about the number of parameters to be used.
  • Only one Params keyword is allowed and no additional Params will be allowed in function declaration after a params keyword.
  • The length of params will be zero if no arguments will be passed.

Examples: To illustrate the use of params keyword

  • Simple program to show the params keyword usage

    // C# program to illustrate the 
    // use of params keyword
    using System;
    namespace Examples {
    class Geeks {
        // function containing params parameters
        public static int Add(params int[] ListNumbers)
            int total = 0;
            // foreach loop
            foreach(int i in ListNumbers) 
                total += i;
            return total;
    // Driver Code    
    static void Main(string[] args)
        // Calling function by passing 5
        // arguments as follows
        int y = Add(12,13,10,15,56);
        // Displaying result

    Output :


    Explanation : There is no need to define the size of the array because using params keyword in above program, the Integer data will be in the form:
    [0] 12
    [1] 13
    [2] 10
    [3] 15
    [4] 56

  • Object type Params will allow any type of arguments and any number of arguments as follows :

    // C# program to illustrate the 
    // use of object type params
    using System; 
    namespace Example2 {
    class Geeks {
            // function using object type params 
            public void result(params object[] array) 
                for (int i = 0; i < array.Length; i++) 
                    // Display result
        // Driver Code 
        static void Main(string[] args) 
            Geeks gfg = new Geeks(); 
            // Variable length arguments
            gfg.result("Geeks", "GFG",
                       "ProGeek Cup 2.0",
                            "G4G", "100");

    Output :

    ProGeek Cup 2.0

    Explanation : In above program the object type params parameter can accept any type of data and any number of arguments.

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