En C# IEqualityComparer Nasıl Kullanılır Sırları

En C# IEqualityComparer Nasıl Kullanılır Sırları

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You get a nice simple bool Equals(T other) function and there's no messing around with casting or creating a separate class.

The inclusion of your comparison class (or more specifically the AsEnumerable call you needed to use to get it to work) meant that the sorting logic went from being based on the database server to being on the database client (your application).

Bey far as best practices around using this interface for your own purposes. I would say that the best practice would be to use it when you are deriving or implementing a class that saf similar functionality to the above mentioned .

Make the properties / fieldInfos fields static; they don't change for each closed instance of the type PropertiesByValueComparer (i.e., for each T passed to it), so you don't need to initialize them for every new instance of the comparer

The IEqualityComparer interface supports only equality comparisons. Customization of comparisons for sorting and ordering is provided by the IComparer interface.

This is because LINQ methods accept IEnumerable birli a parameter. Consequently, they have no concept of the implementation of the original list.

It is essentially the same for this purpose with one subtle difference. In your first example you override Equals using a parameter of type Object and then have to cast it to Customer, however, in your second example you are able to have the parameter of type Customer which means there is no need to cast.

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In theory, there is only one sensible way of comparing two instances of either type: They are equal if the X and Y properties in both instances are equal.

Is there a preferred way of testing two instances of T for equality, or are there several equally C# IEqualityComparer Temel Özellikleri ve Kullanımı valid ways?

Eğitimde, Microsoft'fecir Jerry Nixon ile Crank211'in müessis vasatğı Daren May gibi alanında uzman dü kişi, C# ile alakalı bilgilerini paylaşır. Uzmanlar, kursun her etapında öğrencilere C# IEqualityComparer nerelerde kullanılıyor uygulamalı örnekler sunarak C# dilini henüz anlaşılır kılmaya gayret fiyat.

Good news is that this same Distinct() method C# IEqualityComparer nerelerde kullanılıyor works for collections of our custom objects too. C# IEqualityComparer nerelerde kullanılıyor So if George Clooney accidentally creeps into our collection twice that's not a sorun:

Bizler Box Listemizi istediğimiz şeylere göre kategorize kılmak istediğimiz yürekin kendimize bir kıstas belirlememiz gerekiyor bunu bizim için IEqualityComparer Interface’i yapıyor. Dictionary’imizi oluştururken IEqualityComparer sayesinde oluşturduğumuz Class’ın instance’sını ekliyoruz. Sonrasında Dictionary teker teker gelen verilere bizim verdiğimiz algoritmaya nazaran bakıyor. Öncelik olarak oluşturduğumuz Class’da ki GetHashCode()’ a gidiyor oradan HashCode’u aldatmaıyor eğer önceki eklediği Key’lerde bu HashCode yoksa direkt olarak eklemesini binayor.

Equals/GetHashCode hamiş only internalizes comparison logic, but also globalize them. There might be cases where I would like internal comparison (not using collection) for just one time.