En C# IEqualityComparer Nasıl Kullanılır Sırları

En C# IEqualityComparer Nasıl Kullanılır Sırları

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You get a nice simple bool Equals(T other) function and there's no messing around with casting or creating a separate class.

I'd also suggest small refactoring of FamilySelector class. Currently it holds the veri and performs comparison. Usually implementation of IEqualityComparer is a veri-less class that just performs a comparison:

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GetValueProperties is implemented bey a (single-line) method; to fetch the "class properties" you use the lambda expression inline; the code should be consistent (either do both Where expressions inline, or both bey helper methods)

However, like you said in the conclusion, you dirilik achieve the same result with an expression like that:

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According to the IEqualityComparer code example provided by microsoft, you will want to use the new keyword (so hiding the Equals implementation of the object) for implementing Equals.

So what happens when it comes time to actually deduce the type argument? We have two candidates: Position and BaseClass. Both satisfy the stated bounds. Position satisfies the first bound because it is identical to the first bound, and satisfies the second bound because C# IEqualityComparer Temel Özellikleri ve Kullanımı it is smaller than the second bound.

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... the above suggests I should create a custom collection for any T implementing C# IEqualityComparer nerelerde kullanılıyor IEquatable. Would a collection like List have some kind of subtle bug in it otherwise?

The Equals(T, T) method is reflexive, symmetric, and C# IEqualityComparer Temel Özellikleri ve Kullanımı transitive. That is, it returns true if used to compare an object with itself; true C# IEqualityComparer Kullanımı for two objects x and y if it is true for y and x; and true for two objects x and z if it is true for x and y and also true for y and z.

Typically I'd write MyCustomeComparer which implements IEqualityComparer and pass a MyCustomeComparer object around to whichever objects that need it - I'm sure you're aware of this usage.

If things don't seem to be working (such kakım duplicate key errors when doing ToDictionary) put a breakpoint inside Equals to make sure it's being hit C# IEqualityComparer nedir and make sure you have GetHashCode defined (with override keyword).