params keyword in C#

 The params keyword in C#

Params keyword is useful to specify a method parameter that takes a variable number of arguments in C#. The params keyword is useful when we are not sure about the number of arguments to send as a parameter.

During method declaration only one params keyword is allowed and no additional parameters are permitted after the params keyword in a method declaration in C#.

 We can send arguments of the specified type as a comma-separated list or an array to the declared parameter. In case, if we are not sending any arguments to the defined parameter, then the length of params list will become a zero.

 Example in C#

The following is the example of using params keyword in C# to specify method parameter accept the multiple numbers of arguments.

 using System;

namespace CsharpnaijaTutorial

{

    class Program

    {

        static void Main(string[] args)

        {

            ParamsMethod(1, 2, 3, 4, 5, 6);

        }

        public static void ParamsMethod(params int[] arr)

        {

            for (int i = 0; i < arr.Length; i++)

            {

                Console.Write(arr[i] + (i < arr.Length - 1 ? ", " : ""));

            }

            Console.WriteLine();

            Console.WriteLine("\nPress Enter Key to Exit..");

            Console.ReadLine();

        }

    }

}

 

From above example, we are sending a comma separated list of multiple arguments of the specified type (integer) to the declared parameter in ParamsMethod function.

 In the example above, we are sending only the integer types of arguments to the method parameter. In case, if you want to send a list of multiple types of arguments, then we need to use object type parameter in the method declaration.

 Params Keyword with Object Type

The following is the example of using object type parameter in a method declaration to accept the list of multiple types of arguments.

 

using System;

namespace CsharpnaijaTutorial

{

    class Program

    {

        static void Main(string[] args)

        {

            ParamsMethod(1, 2, "Musa", "Sule", "Gadabs", 10.26);

        }

        public static void ParamsMethod(params object[] arr)

        {

            for (int i = 0; i < arr.Length; i++)

            {

                Console.Write(arr[i] + (i < arr.Length - 1 ? ", " : ""));

            }

            Console.WriteLine();

            Console.WriteLine("\nPress Enter Key to Exit..");

            Console.ReadLine();

        }

    }

}

The above example, we used object type parameter in method declaration and accepting different data type of arguments as a list.

 

 References

1.     MicrosoftDocumentation

2.     Tutlane

3.     JavatPoint