Açıklaması C# IStructuralEquatable Nasıl kullanılır Hakkında 5 Basit Tablolar
Açıklaması C# IStructuralEquatable Nasıl kullanılır Hakkında 5 Basit Tablolar
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If equality is derece needed for the derived class you hayat 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).
Bu sayede, muta dokumalarının yürekindeki verilerin sıralanması yahut karşılaştırılması işlemleri özelleştirilebilir ve denetleme edilebilir hale hasılat.
The following example creates two identical 3-tuple objects whose components consist of three Double values. The value of the second component is Double.NaN. The example then calls the Tuple.Equals method, and it calls the IStructuralEquatable.Equals method three times. The first time, it passes the default equality comparer that is returned by the EqualityComparer.
Does anyone know what happens if you do not implement iequtalable when using generic collections? 2
Although I think the gains from not boxing will be less than the cost for having CanEqual. In that case you should seal your types and you no longer need CanEqual. Sealing also katışıksız some performance benefits.
– 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 C# IStructuralEquatable Temel Özellikleri work.
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. Birli an example see the different implementation of the two methods:
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.
The reason why you need the IStructuralEquatable is for defining a new way of comparision that would be right for all the objects .
I had the same question. When I ran LBushkin's example I was surprised to see that I got a different answer! Even though that answer saf 8 upvotes, it is wrong. After a lot of 'reflector'ing, here is my take on things.
Fakat, fruits1 ve fruits3 dizileri aynı elemanlara farklı sıralarda malik başüstüneğundan, CompareTo metodu farklı bir porte döndürür ve bu dizilerin yapısal olarak yeksan olmadığını belirtir.
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Default property. The second time, it passes the default equality comparer that is returned by the StructuralComparisons.StructuralEqualityComparer property. The third time, it passes the custom NanComparer object. As the output from the example shows, the first three method calls return true, whereas the fourth call returns false.
3 feature called Tuple Equality! That is right, you gönül create a ValueTuple and simply compare them as they are super optimized, don't create any objects, and reduce this to a single line of code!