Anonymous delegates in C#
Listopad 17th, 2008 . by vipBeware of anonymous delegates in C#! You’ve to instanize new variable to have them in own delegate instances. If not, you’ll get the last value of variable in loop.
Short snippet for Gtk#. It creates dynamic buttons and actions from DataTable (e.g. database). Pay attention to line // [1], when “variable capturing” is used.
C#:
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foreach(DataRow g in groups.Rows)
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{
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DataRow tmp = g; // [1]
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b.Clicked += delegate {
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Console.WriteLine(“I’m button {0}, id {1}”,
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tmp[“name”], tmp[“id”]);
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};
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hbuttonbox.PackStart( b );
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b.Show();
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}
More info at http://blogs.msdn.com/abhinaba/archive/2005/10/18/482180.aspx and google…
Thanks goes to Miguel (#mono @ irc.gimp.net)