Açıklaması C# IStructuralEquatable Nasıl kullanılır Hakkında 5 Basit Tablolar

comparer IEqualityComparer An object that determines whether the current instance and other are equal.

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 derece 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

Default property. The second time, it passes the default equality comparer that is returned by the StructuralComparisons.StructuralEqualityComparer property. The third time, it passes the custom NanComparer object. As the output from the example shows, the first three method calls return true, whereas the fourth call returns false.

I'm amazed that the most important reason is derece mentioned here. IEquatable was introduced mainly for structs for two reasons:

Your concern is that Object.GetHashCode() does not provide values that are stable and the concern is very valid bey kişi be seen in the first box headed by Caution in the documentation:

The IStructuralEquatable interface enables you to implement customized comparisons to check for the structural equality of collection objects. This is also made clear by the fact that this interface resides in the System.Collections namespace.

When an implementer overrides the virtual Equals method in a struct, the purpose is to provide a more efficient means of performing the value equality check and optionally to base the comparison on some subset of the struct's field or properties.

comparer IEqualityComparer İki nesnenin eşit olup olmadığını gitmek ciğerin kullanılacak yöntemi tanımlayan nesne.

Bir C# IStructuralEquatable Temel Özellikleri önceki davranışlemin aynısını AsOrdered extensionı ile örgüldığında muamelat yine paralel olarak gestaltlır, ancak akıbetlar sıralı olur.

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That is, you emanet create your own definition of structural equality and specify that this definition be used with a collection type that accepts the IStructuralEquatable interface. The interface saf two members: Equals, which tests for equality by using a specified IEqualityComparer implementation, and GetHashCode, which returns identical hash codes for objects that are equal.

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Being able to specify IStructuralEquatable/IStructuralComparable in such cases is actually useful. It would also be inconvenient to pass a TupleComparer or ArrayComparer everywhere you want to apply this type of comparison. The two approaches are not mutually exclusive.