Için basit anahtar C# IStructuralEquatable Kullanımı örtüsünü

Için basit anahtar C# IStructuralEquatable Kullanımı örtüsünü

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comparer IEqualityComparer An object that determines whether the current instance and other are equal.

Now, when we call Equals ourselves it will directly call our new fancy Equals that takes in a ScreenMetrics, which is great.

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

As far bey I see this is only exposed through the StructuralComparisons class. The only way I emanet figure out to make this useful is to make a StructuralEqualityComparer helper class kakım follow:

Birli 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.

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 bey an argument to the Equals method, you can define a custom equality comparison for the array or collection.

The IEquatable implementation will require one less cast for these classes and birli a result will be slightly faster than the standard object.Equals method that would be used otherwise. As an example see the different implementation of the two methods:

Yani anlayacağınız “int” üzere, “bool” üzere paha tipli bir değişken peyda etmek istiyorsanız struct yapısını yeğleme edebilirsiniz.

The first issue we see here is that this struct is mutable in that you emanet actually change the veri later on via the kaş 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 hamiş fear because Dustin told me and showed me that Visual Studio will generate all of this for you!!!!! Check this out:

C# IStructuralComparable Determines whether the current collection object precedes, occurs in the same position bey, or follows another object in the sort order.

Ha, makalede nekais olur. Bunu tenkit olarak onaylama ediyorum. Işlevsel programlamada struct kullanılmasının nedenini de bilmiyor, performans ve başka mevzular için da rastgele bir düşünce barındırmıyorum. Siz biliyorsanız lütfen aydınlatır mısınız?

Here the C# IStructuralEquatable nerelerde kullanılıyor comparison is different for value type arrays and custom arrays. In .Net 4.0 int, string will internally implement IEquatable for custom types we have to externally implement the IEquatable.

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