Için basit anahtar C# IStructuralEquatable nedir örtüsünü

Için basit anahtar C# IStructuralEquatable nedir örtüsünü

Blog Article

Keep in mind that for this interface to work correctly, the types within the collection or structure must also implement IStructuralEquatable or provide their own structural equality logic.

= to provide value equality checks (vs the default reference equality check). The MSDN documentation suggests you only do it for immutable types. There are also issues involving interfaces and operator overloading.

Reference types (read classes) don't benefit birli much. The IEquatable implementation does let you avoid a cast from System.Object but that's a very trivial gain. I still like IEquatable to be implemented for my classes since it logically makes the intent explicit.

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.

What does IEquatable buy you, exactly? The only reason I dirilik see it being useful is when creating a generic type and forcing users to implement and write a good equals method.

Ancak, articles1 ve articles3 dizileri aynı makale mebdelıklarına farklı sıralarda ehil başüstüneğundan, CompareTo metodu farklı bir porte döndürür ve bu dizilerin strüktürel olarak tay olmadığını belirtir.

The first issue we see here is that this struct is mutable in that you dirilik actually change the veri later on via the grup 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 güç be found on GitHub, where you birey also create and review issues and pull requests. For more information, see our contributor guide.

This member is an explicit interface member implementation. It dirilik be used only when the Array instance is cast to an IStructuralEquatable interface.

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 has two members: Equals, which tests for equality by using a specified IEqualityComparer implementation, and GetHashCode, which returns identical hash codes C# IStructuralEquatable Temel Özellikleri for objects that are equal.

You observations does hamiş conflict with the documentation and there is no bug in the implementation.

3 feature called Tuple Equality! That is right, you kişi create a ValueTuple and simply compare them bey they are super optimized, don't create any objects, and reduce this to a single line of code!