5 Temel Unsurları için C# IEqualityComparer Temel Özellikleri ve Kullanımı

5 Temel Unsurları için C# IEqualityComparer Temel Özellikleri ve Kullanımı

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The last statement basically means that in case we rely on Equals(..) method we could calculate hash based only on the last name and the result will still be the same:

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Varsayılan içinlaştırıcı, IComparable arabirimini uygulamak derunin huzurlaştırılan nesnelerden en azca birini kullanır . Liste koleksiyonunda mesabe olarak yahut sözlük koleksiyonunda anahtar olarak kullanılan tüm sınıflarda IComparable uygulamak yararlı bir uygulamadır. Genel bir koleksiyon için, denklik katlaştırması süflidakilere için belirlenir:

Bir dahaki sefere yorum yaptığımda kullanılmak üzere kademı, e-posta adresimi ve web kent adresimi bu tarayıcıevet kaydet.

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Since IEqualityComparer is contravariant in the type T, you kişi use the base class comparer with distinct if you specify the generic parameter to Distinct:

Oluşturduğunuz klası, derlem oluştururken veya zıtlaştırma gerektiren sair senaryolarda kullanabilirsiniz.

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In the editor, place the caret at the type name or within a type at the line where you want to insert an equality comparer class. If the caret is on the type name, the generated code will be added in the beginning of the type declaration.

If it is possible, yaşama we add an attribute to a property to say that this property is derece relevant in the comparison?

comparing two objects for values C# IEqualityComparer Temel Özellikleri ve Kullanımı without listing every column See more linked questions Related

Now, think of a field or fields that differentiate our class, ID for example. IEqualityComparer helps you to manage and improve the efficiency

And yes, after this the output of the program doesn't change at all. So, what the hell is LINQ doing and why doesn't it even try to use C# IEqualityComparer Temel Özellikleri ve Kullanımı the equality comparer that we have provided? The situation was even bitter for me because I was trying to use Distinct() combined with custom equality C# IEqualityComparer nedir comparer to prepare veri for pushing to data base, so I ended up with SQL Server telling me that I am breaking a primary key C# IEqualityComparer Nasıl Kullanılır constraint. Because of being focused on a broader sıkıntı I didn't take time to think over C# IEqualityComparer Kullanımı the stuff that I was trying to use. What I missed was the fact that LINQ, being a query engine, tries to perform bey efficiently kakım possible.

If things don't seem to be working (such bey duplicate key errors when doing ToDictionary) put a breakpoint inside Equals to make sure it's being hit and make sure you have GetHashCode defined (with override keyword).