Için basit anahtar C# IStructuralEquatable Kullanımı örtüsünü

Için basit anahtar C# IStructuralEquatable Kullanımı örtüsünü

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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?

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It differs from reference equality, which indicates that two object references are equal because they reference the same physical object.

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. Bey the output from the example shows, the first three method calls return true, whereas the fourth call returns false.

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Structural equality means that two objects are equal because they have equal values. It differs from reference equality, which indicates that two object references are equal because they reference the same physical object. The IStructuralEquatable C# IStructuralEquatable Nasıl kullanılır interface enables you to implement customized comparisons to check for the structural equality of collection objects.

So, I am apparently wrong bey unequal objects may have equal hash codes. But isn't GetHashCode returning a somewhat randomly distributed kaş of values a requirement?

Defines a generalized method that a value type or class implements to create a type-specific method for determining equality of instances.

The first issue we see here is that this struct is mutable in that you güç actually change the veri later on via the takım properties. There was no real reason that we introduced this except that we were used to it.

Collaborate with us on GitHub The source for this content kişi be found on GitHub, where you birey also create and review issues and pull requests. For more information, see our contributor guide.

To achieve this, employee objects with matching SSN properties would be treated birli logically equal, even if they were derece 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.

Just look at the default ValueType.Equals(object) code that gets called otherwise. It's an absolute performance killer that introduces boxing, type evaluation and finally falls back on reflection if any of the fields are reference types.

Specifically, I do derece know the exact type of the object. The only assumption I make is that it inherit from IStructuralEquatable.