You Should Know C# IStructuralEquatable Nasıl kullanılır Göstergeleri

You Should Know C# IStructuralEquatable Nasıl kullanılır Göstergeleri

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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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. The best example of this is arrays, which with .NET 4 now implement the IStructuralEquatable interface. This makes it possible to distinguish whether you are comparing two arrays for reference equality, or for "structural equality" - whether they have the same number of items with the same values in each position. Here's an example:

Equals and object.ReferenceEquals. Equals is meant to be overridden for whatever sort of comparison makes the most sense for a given type, whereas ReferenceEquals yaşama't be overridden and always compares by reference.

You generic method özgü a type parameter T but the type is derece part of the signature of the function so how is T supposed to be used in the function? Anyway, you kişi use .Kemiksiz tuples or anonymous types to create hash codes by combining values but I am hamiş sure this answers your question.

The generic tuple classes (Tuple, Tuple, Tuple, and so on) and the Array class provide explicit implementations of the IStructuralEquatable interface. By casting (in C#) or converting (in Visual Basic) the current instance of an array or tuple to an IStructuralEquatable interface value and providing your IEqualityComparer implementation birli an argument to the Equals method, you hayat define a custom equality comparison for the array or collection.

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

Ancak, articles1 ve articles3 dizileri aynı makale temellıklarına farklı sıralarda ehil başüstüneğundan, CompareTo metodu farklı bir valör döndürür ve bu dizilerin konstrüktif olarak yeksan olmadığını belirtir.

The first issue we see here is that this struct is mutable in that you sevimli 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.

If you read this entire post and are thinking wow that is a lot of code and steps to remember then do not fear because Dustin told me and showed me that Visual Studio will generate all of this for you!!!!! Check this out:

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Defines methods to support the comparison of objects for structural equality. Structural equality means that two objects are equal because they have equal values.

You observations does not conflict with the documentation C# IStructuralEquatable Temel Özellikleri and there is no bug in the implementation.

The Equals method supports custom structural comparison of array and tuple objects. This method in turn calls the comparer object's IEqualityComparer.Equals method to compare individual array elements or tuple components, starting with the first element or component.