1.29. C # parameter array

Sometimes, when you declare a method, you cannot determine the number of parameters to pass to the function as arguments. The C # parameter array solves this problem, which is usually used to pass an unknown number of arguments to the function.

1.29.1. Params keyword #

When using arrays as formal parameters, C # provides params keyword, which allows you to pass either an array argument or an array of elements when calling a method with an array of formal parameters. params format of the use is:

Public return type method name (params type name [] array name) 

1.29.2. Example #

The following example shows how to use a parameter array:

Example #

using System; namespace ArrayApplication { class ParamArray { public int AddElements(params int[] arr) { int sum = 0; foreach (int i in arr) { sum += i; } return sum; } } class TestClass { static void Main(string[] args) { ParamArray app = new ParamArray(); int sum = app.AddElements(512, 720, 250, 567, 889); Console.WriteLine("The total is： {0}", sum); Console.ReadKey(); } } } 

When the above code is compiled and executed, it produces the following results:

The total is： 2938