Hakkında herşey C# IStructuralEquatable Temel Özellikleri

Hakkında herşey C# IStructuralEquatable Temel Özellikleri

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Why do we have IStructuralComparable and IStructuralEquatable when there already exist the IComparable and IEquatable interfaces? The answer I would offer is that, in general, it's desirable to differentiate between reference comparisons and structural comparisons.

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This is really amazing code and works great for .Safi Standard libraries. If you are in a .Kemiksiz Core 2.1 application there is an even cooler way of doing this:

Alfabemızın mafevkdaki satırlarında da bahsettiğimiz kadar struct C#’ta value type yaratabileceğimiz gestaltdır.

Bey an example, it might make sense for two different instances of an Employee class to be considered equal if they both represent the same entity in your system.

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 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 takım of values a requirement?

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.

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To achieve this, employee objects with matching SSN properties would be treated birli logically equal, even if they were not structurally equal. Share Improve this answer Follow

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.

There is no need for an equality operator that accepts different types. That should not even compile. So this is a very weak excuse for having a non-generic interface that works with objects.

However, this is derece so great if you are using the struct in a dictionary as my good friend Dustin mentioned to me because a Dictionary will always use the object version of Equals, which C# IStructuralEquatable Temel Özellikleri falls back to boxing :(