Için basit anahtar C# IStructuralEquatable Kullanımı örtüsünü

Için basit anahtar C# IStructuralEquatable Kullanımı örtüsünü

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It's normally expected that if you implement IEquatable.Equals you will also override Object.Equals to be consistent. In this case how would you support both reference and structural equality?

In certain scenarios (such kakım using the value type as a key in a dictionary) it can murder performance in one foul swoop.

g. MyType and Object) which will still use the identity comparison. I suspect it's hamiş a great idea to do this unless it's going to be a very heavily used type in your code, where everyone will become very familiar with it and

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.

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.

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

1 My understanding is that it's used for collection like types, and encapsulates the structural part of the comparison, but leaved the comparison of the elements to a comparer passed in by the user. But I'm not really sure if I really got it.

In my implementation I delegated the task of calculating hash codes to the internal array. While testing it, to my great surprise, I found that my two different arrays had the same structural hash code

The reason why you need the IStructuralEquatable is for defining a new way of comparision that would be right for all the objects .

Bu örnekte, articles1 C# IStructuralEquatable nerelerde kullanılıyor ve articles2 dizileri aynı makale başlangıçlıklarına aynı sırada malik evetğundan, CompareTo metodu 0 döndürerek bu dizilerin strüktürel olarak müsavi bulunduğunu belirtir.

C# IStructuralEquatable Defines methods to support the comparison of objects for structural equality.

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 I have the old values, I emanet 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. As the output from the example shows, the first three method calls return true, whereas the fourth call returns false.

Burada uyanıklık ederseniz eğer ms.x ve ms.y değfiilmeyeceğinden dolayı bir Deep Copy gır konusudur. Eğer referans tipli örgülar olsalardı adidaki kabil bir sonuç elde edilecekti ve Shallow Copy kelime konusu olacaktı.