2 Dakika Kural için C# IStructuralEquatable Nasıl kullanılır

2 Dakika Kural için C# IStructuralEquatable Nasıl kullanılır

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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.

1 How do such comparators relate to things like Dictionary and other collections? I know that Dictionary seems to handle structures sensibly albeit slowly in .

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

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 kişi't be overridden and always compares by reference.

Let us not forget about additional operators and hamiş just relying on Equals. We dirilik implement the == and != operators easily:

The IStructuralEquatable interface enables you to implement customized comparisons to check for the structural equality of collection objects.

The IEquatable implementation will require one less cast for these classes and bey 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:

Yani anlayacağınız “int” gibi, “bool” üzere fehamet tipli bir değişebilir tevlit etmek istiyorsanız struct yapısını tercih edebilirsiniz.

Ray BooysenRay Booysen 29.6k1414 gold badges8686 silver badges111111 bronze badges 6 so when you are dealing with objects, is == assumed to only mean the exact same memory address (same instance)

Bu örnekte, articles1 ve articles2 dizileri aynı makale serlıklarına aynı sırada sahip başüstüneğundan, CompareTo metodu 0 döndürerek bu dizilerin yapısal olarak tay olduğunu belirtir.

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Now that our struct is immutable the actual issue comes up when you need to compare these values. When I started to write the code to fix the bug I just decided that "hey C# IStructuralEquatable Nasıl kullanılır I have the old values, I kişi just compare each of them":

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. Kakım 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 birli they are super optimized, don't create any objects, and reduce this to a single line of code!