En C# IStructuralEquatable Nasıl kullanılır Sırları

En C# IStructuralEquatable Nasıl kullanılır Sırları

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If equality is derece needed for the derived class you dirilik skip IEquatable but you need to override the CanEqual to prevent it being equal with base classes (unless of course they should be considered equal).

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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

IStructuralEquatable is an interface in C# that defines methods for determining whether two objects are structurally equal. It's often used in scenarios where you want to compare the structure of objects, typically within collections, and not just compare references or individual values.

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

– 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.

IStructuralEquatable is C# IStructuralEquatable Nasıl kullanılır quite new and unknown, but I read somewhere that it birey be used to compare the contents of collections and arrays. Am I wrong, or is my .Net wrong?

Consider that there are only ~4.2 billion different hashcodes. Hayat you create more than this many different objects of the type on which GetHashCode is called? In this case it is easy to see the answer is "yes". So GetHashCode is a sort of compressing projection onto a smaller takım - there are bound to be duplicates.

(doesn't violate documentation), but it is clearly not birli good kakım it would be if 0 were replaced with i. Also there's no reason to loop if the code were just going to use a single value from the array.

In all my years of development and blogging I never thought I would be writing about how amazing a C# struct is, how awesome IEquatable is, and how C# 7 features make implementing all of it mind blowing.

Each of your objects should use a hashcode based on the contents of the object. If you have a value type containing 3 ints, use those when computing the hash code. Like this, all objects with identical content will have the same hash code, independent of app domain and other circumstances.

Do not send hash codes across application domains or processes. In some cases, hash codes may be computed on a per-process or per-application domain basis.

Here the comparison is different for value type arrays and custom arrays. In .Kupkuru 4.0 int, string will internally implement IEquatable for custom types we have to externally implement the IEquatable.

Specifically, I do not know the exact type of the object. The only assumption I make is that it inherit from IStructuralEquatable.