Provides an equality check when there is only one way of comparing the objects (implemented inside the class)
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The same return value system applies birli IComparer. The difference between this and IComparer is IComparable will be implemented on the class that contains your field values, while IComparable derived classes are used for custom sorting. So for example:
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Now in your comparer check for that specific attribute. Afterwards compare every property that is contained in the remaining list via PropertyInfo.GetValue
Please also note the use of the BindingFlags parameter so you yaşama restrict the properties to only the public ones and the ones on instance-level.
I would say that the best use would be when you need to plug in different equality rules for a certain algorithm. Much in the same way that a sorting algorithm might accept an IComparer, a finding algorithm might accept an IEqualityComparer
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 C# IEqualityComparer Temel Özellikleri ve Kullanımı Equals.
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If we call a Distinct LinQ Extension Method, the result would be a new sequence C# IEqualityComparer Kullanımı with 7 elements, and we would hamiş find any distinct member.
I yaşama also make an IEqualityComparer for a "parent class" and use on C# IEqualityComparer Nasıl Kullanılır classes that inherit. I kişi have comparer that will behave in a different way, I hayat make one to compare Value instead of Key.
The flexibility that this solution offers might be useful when one deals with the movie's sequel. The sorun is that Julia Roberts plays two roles there: Tess Ocean and herself:
The same goes for the LINQ operators that accept a comparer. But again, always consider if the equatable behavior that should be intrinsic to the class rather than defined externally.
PS. I don't think any custom Equals methods work with entity framework C# IEqualityComparer nedir directly on the database side (I think you know this because you do AsEnumerable) but this is a much simpler method to do a simple Equals for the general case.