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gbertoli3
post 30 Aug, 2008 - 07:04 AM
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I am trying to make a gradient background for my form. I was wondering how do you make some of the args optional.

I know that in VB.NET you can do this
CODE

    Private Sub someSub(Optional ByVal TrueOrFalse As Boolean = False)

    End Sub


Now how would you do that in C#?
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PsychoCoder
post 30 Aug, 2008 - 07:10 AM
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C# doesn't allow optional parameters/arguments. The alternative would be to use Overloaded methods. If you think about it, a method with an optional argument is actually two different methods to begin with, so C# left that option out
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eclipsed4utoo
post 30 Aug, 2008 - 07:13 AM
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C# doesn't have this functionality. Overloaded methods can get you the same functionality though.

c#

private void Optional()
{
      OptionalTest(string.Empty);
}

private void Optional(string test)
{

}
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PsychoCoder
post 30 Aug, 2008 - 07:21 AM
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hmmm straight from http://tangiblesoftwaresolutions.com/Artic...0Parameters.htm eh eclipsed4utoo? tongue.gif
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gbertoli3
post 30 Aug, 2008 - 07:30 AM
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Ok Thanks Guys
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eclipsed4utoo
post 30 Aug, 2008 - 08:46 AM
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QUOTE(PsychoCoder @ 30 Aug, 2008 - 11:21 AM) *

hmmm straight from http://tangiblesoftwaresolutions.com/Artic...0Parameters.htm eh eclipsed4utoo? tongue.gif


ph34r.gif

I was going to say that optional parameters didn't exist in C#, but I wanted to make sure before I posted it. So I did a quick search and that was the site that I saw. cool.gif
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baavgai
post 30 Aug, 2008 - 09:29 AM
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I agree that overloading methods is what probably you're looking for.

However, in the interests of full disclosure, there is an optional parameters syntax. The keyword is params and this guy did a pretty good writeup on it.
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jacobjordan
post 30 Aug, 2008 - 11:09 AM
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Well, technically there is a way in C#. Here is some function in VB.NET with an optional value:
vb

    Public Sub OptionalThingy(Optional ByVal SomeParam As Integer = 5345342)

    End Sub

Would be the equivilent of this in C#: (using System.Runtime.InteropServices)
csharp

        public void OptionalThingy([Optional, DefaultParameterValue(0x51903e)] int SomeParam)
        {

        }

However, C# won't recognize it as optional, so you'll have to pass it a value anyway.
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