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Silverlight 4.0 Optional & Named Parameters

Posted By: niqbal Posted Date: September 03, 2010 Points: 0 Category :ASP.Net

Named & optional parameters are a new C# language feature coming up with .NET FX 4.0 and guess what. it's in Silverlight 4 as well! Optional parameters will come very useful when defining complex APIs where you would usually have to provide several overloads for the same method for it to make sense to wide variety of usages. Let's take a look at this basic example:public void PositionWindow(bool isTopMost, double left = 0, double top = 0, double width = 800, double height = 600){Window window = Application.Current.MainWindow; window.TopMost = isTopMost;window.Left = left; window.Top = top;window.Width = width;window.Height = height;} isTopMost is the only parameter that's required, all other parameter specify their default value, which makes them optional. But what if you wanted to provide the size only and leave the position to be set to defaults? Enter named parameters. The same method above can be called also with:PositionWindow(isTopMost:true, width: 600, height: 200); // named parametersPositionWindow(true, width: 600, height: 200); // naming is optional when positioned rightPositionWindow(true, height: 200, width: 600); // order doesn't matterPositionWindow(height: 200, width: 600, isTopMost: true); // ... even with the required parameters Simple ... Cheers:)

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