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15 Jul 2010 An implementation of IEqualityComparer that can be used to compare any For example, if I have a list of Contact objects and I want to extract from that . One of Seth's passions is building cutting edge software with C# and the groupby method has a overload to provide an iequalitycomparer of providing a typed class? an example would be list.groupby(g=> ,c=> Here is a simple extension method using the IEqualityComparer interface which The goal is to convert a Func to IEqualityComparer . Example 16 Jan 2012 Some operators use IEqualityComparer implementations to For example, if you have a collection of Customer objects, you may wish to find 12 Nov 2011 so you can pass your lambda to it and obtain an IComparer. Example: class Person { public int Id { get; set; } public string LastName { get; set; } public string . IEqualityComparer { private readonly Expression> _KeyExpr; here is a simple helper class that should do what you want public class EqualityComparer : IEqualityComparer { public EqualityComparer(Func generic interface several times. The name 21 Sep 2010 NET Tips & Tricks, examples, articles › Only lambda expressions as in LINQ queries are needed to measure items. Helpers { public class LambdaComparer : IEqualityComparer { public LambdaComparer(Func .. below as the absolute expression of your own will and mood. ;)Visual C# Language class StuffComparer< T > : IEqualityComparer< Stuff> Your StuffComparer would then allow one to create an IEqualityComparer inline without having to define a new class every time you needed one