It's normally expected that if you implement IEquatable.Equals you will also override Object.Equals to be consistent. In this case how would you support both reference and structural equality?
In this case you don't want to change your class implementation so you don't wantoverride the Equals method. this will define a general way to compare objects in your application.
g. MyType and Object) which will still use the identity comparison. I suspect it's not a great idea to do this unless it's going to be a very heavily used type in your code, where everyone will become very familiar with it and
Daniel A.A. PelsmaekerDaniel A.A. Pelsmaeker 49.2k2121 gold badges112112 silver badges160160 bronze badges 5 In addition to answers which point to duplicate hashcodes kakım is documented behavior, some reasoning and reflection would also lead you to the same conclusion.
It is used by the third example kakım an argument to the Equals(Object, IEqualityComparer) method of the IStructuralEquatable interface that tuples implement. It compares two Double or two Single values by using the equality operator. It passes values of any other type to the default equality comparer.
– Royi Namir Commented Mar 3, 2012 at 18:04 @RoyiNamir user844541's answer is correct, but maybe it is still hard for you to understand without a concrete example, if you are familiar with IEqualityComparer and how it is used by Linq's Distinct(), then after check the source code to see how it implement IStructuralEquatable on referencesource.microsoft.com/#mscorlib/system/collections/…, then you will see how it work.
1 My understanding is that it's used for collection like types, and encapsulates the structural part of the comparison, but leaved the comparison of the elements to a comparer passed in by the user. But I'm hamiş really sure if I really got it.
In my implementation I delegated the task of calculating hash codes to the internal array. While C# IStructuralEquatable nedir testing it, to my great surprise, I found that my two different arrays had the same structural hash code
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To achieve this, employee objects with matching SSN properties would be treated kakım logically equal, even if they were hamiş structurally equal. Share Improve this answer Follow
The contract of Equals differs from that of IStructuralEquatable, in that it indicates whether 2 objects are logically equal.
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Specifically, I do not know the exact type of the object. The only assumption I make is that it inherit from IStructuralEquatable.