C# IStructuralEquatable nedir Için Adım Haritaya göre Yeni Adım

C# IStructuralEquatable nedir Için Adım Haritaya göre Yeni Adım

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If equality is derece needed for the derived class you dirilik 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).

In this case you don't want to change your class implementation so you don't wantoverride the Equals method. this will define a general way to compare objects in your application.

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

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 can'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:

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 hamiş really sure if I really got it.

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.

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 give you the correct results in this super simple example:

When working with collections or structures where the order of elements matters, and you want to compare their structures, IStructuralEquatable can be useful.

Ancak, fruits1 ve fruits3 dizileri aynı elemanlara farklı sıralarda ehil olduğundan, CompareTo metodu farklı bir valör döndürür ve bu dizilerin yapısal olarak eşit olmadığını belirtir.

Bu konstrüksiyonya derece oluşturduğumuz bütün nesnelerin Heap kısmında olduğunu söylemiştik. Halbuki Stack kısmında struct örgüsında nesneleri tutabilmekteyiz.

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

The Equals method supports custom structural comparison of array and tuple objects. This method in turn calls the comparer object's IEqualityComparer.Equals method to compare individual array elements or tuple components, starting with the first element or component.