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Optional Arguments

Posted on 2004-08-17
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Last Modified: 2010-04-17
Dear Friends,
I am new to C#.Can anybody tell me how to pass optional arguments while calling a function in C#.Also, what is the use of "param"  keyword?
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Question by:Dharmen-Patel
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mjdmjd earned 200 total points
ID: 11819529
The param thing is for your comments - see this on the MS website

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/csref/html/vclrfparam.asp

As for the optional arguments, you can either overload the method i.e.

public void foo (string mystr)
{
}

public void foo (string mystr, bool mybool)
{
}

or use the params keyword (which is maybe what you meant instead of param in your origional question)

   public static void UseParams(params int[] list)
   {
      for ( int i = 0 ; i < list.Length ; i++ )
         Console.WriteLine(list[i]);
      Console.WriteLine();
   }

You can then call this function with any number of integers like this

useparams(1)
useparamts(1,2,3,4,5,6)
etc ...

only thing to watch out for is that the params keyword has to come after any other paramaters.

hope this helps
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