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Posted By

rengber on 04/20/09


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lambda Linq IEnumerable ExtensionMethod


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ddevening
umang_nine


LINQ Extension Methods

 / Published in: C#
 

LINQ Extension method called with delegate, anonymous delegate, and lambda delegate.

Note that this only returns a "default" in the sense that it does not throw an exception if no item in the source matches the selection criteria. .First() does throw an exception in this case.

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  1. [TestMethod]
  2.         public void DemoLINQExtensionMethods()
  3.         {
  4.             List<int> ints = new List<int>(new int[] { 1, 11, 12 });
  5.             //Standard Delegate
  6.             int val = ints.FirstOrDefault(ThisOneGoesToEleven);
  7.             Assert.IsTrue(val == 11, "Eleven was not found. Value = " + val.ToString());
  8.             //Using Anonymous Method
  9.             val = ints.FirstOrDefault(delegate(int i) { return i == 11; });
  10.             Assert.IsTrue(val == 11, "Eleven was not found. Value = " + val.ToString()); 
  11.             //Using equivalent Lambda syntax
  12.             val = ints.FirstOrDefault(x => x == 11);
  13.             Assert.IsTrue(val == 11, "Eleven was not found. Value = " + val.ToString());
  14.         }
  15.         private bool ThisOneGoesToEleven(int volume)
  16.         {
  17.             return volume == 11;
  18.         }

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