params

Question

Hi friends I want to know about the params keyword and how to use the params keyword.? thank you.

Satyapriya Nayak · Answer

Hi Ravi The params keyword allows methods to have a variable length parameter list. For example the following class defines a method called MultiPrint which can have any number of string's passed to it. using System; public class MyApplication { public static void MultiPrint(params string[] list) { for ( int i = 0 ; i Console.WriteLine(list[i]); } public static void Main() { MultiPrint(First Second Third); MultiPrint(Fourth); MultiPrint(Fifth Sixth); } } Running this program prints out: First Second Third Fourth Fifth Sixth There can only be one params keyword per method declaration and it can only be on the final parameter in the list. Normal 0 Parameter array in vb.net Condition of using this array 1.It must be the lone argument in the parameter declaration or it is used only once. 2.It is passed by call by value. 3.It must be the one dimensional array. 4.It must be the last argument in the parameter declaration. 5.A keyword param array is used after by val. Program Public Class Form1 Private Sub Button1_Click( ByVal sender As System.Object ByVal e As System.EventArgs) Handles Button1.Click sname( Student Name  raj  ravi  abhijit  rahul  adarsh ) End Sub Private Sub sname( ByVal s As String  ByVal ParamArray ar() As String ) Dim i As Integer TextBox1.Text += s + vbCrLf For i = 0 To UBound(ar) TextBox1.Text += ar(i) + vbCrLf Next End Sub End Class Output Student Name raj ravi abhijit rahul adarsh Please refer the below link http://www.csharpfriends.com/articles/getarticle.aspx?articleid=49 Thanks

Vulpes · Answer

The 'params' keyword is used to indicate that an argument to a method is a parameter array i.e. it can consist of not one but several values of the same type separated by commas. A parameter array must be the last (or only) argument to a method. Check this link for an example: http://msdn.microsoft.com/en-us/library/w5zay9db.aspx