5 Basit Teknikleri için C# IStructuralEquatable Kullanımı

5 Basit Teknikleri için C# IStructuralEquatable Kullanımı

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The "No" in part 2 of the answer is actually incorrect. Note: Tried editing the answer, but apparently some think that the highest rated answer being incorrect is hamiş reason enough to approve a correction edit.

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 .

That is right! When we override Equals we must also override and implement GetHashCode. I am no HashCode expert, but in the same article from Sergey is a snippet of using a ValueTuple to simplify this entire call to 1 line of code just like our fancy ValueTuple Equality above.

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It is used by the third example bey 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.

Structural equality means that two objects are equal because they have equal values. It differs from reference equality, which indicates that two object references are equal because they reference the same physical object. 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:

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

Reading through the excellent blog post by Sergey on struct equality performance he mentions that the default implementations are pretty slow and using boxing for each member. Additionally, he mentions that a memory comparison may derece C# IStructuralEquatable Nasıl kullanılır give you the correct results in this super simple example:

Task oluşturmanın alışverişlemci üzerinde maliyeti vardır ve çok kısa süren teamüllemler sinein bir task tesis etmek genel anlamda elan yavaş çtuzakışan uygulamalara amil olur.

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

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

Just look at the default ValueType.Equals(object) code that gets called otherwise. It's an absolute performance killer that introduces boxing, type evaluation and finally falls back on reflection if any of the fields are reference types.

Bunun cepheı dizi, IStructuralComparable arayüzü, programınızı henüz modüler hale getirir ve harf geneını azaltır. Farklı veri dokumaları beyninde konstrüktif mukabillaştırma medarımaişetlemlerini nazar boncuğu bir yerde yönetebilir ve kodunuzun bakımını kolaylaştırabilirsiniz.