5 Temel Unsurları için C# IEqualityComparer Nasıl Kullanılır

5 Temel Unsurları için C# IEqualityComparer Nasıl Kullanılır

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IEqualityComparer is a generic .Kupkuru interface that allows implementing customized equality comparison for collections.

ReSharper provides the Generate equality comparer command to automate generation of the comparer class.

The CompareTo method would be the default way of ordering your User class, perhaps comparing by Name. If you then decided that you wanted to sort a list of User objects by another property, say Age, you could write a class that implemented IComparer instead of altering CompareTo inside User. This would perform the custom sorting, for example:

fakat ben sadece otomatik olarak mavi ve 0 ın tekrarlanmamasını buttona basmış olduğumda otomatik olarak silinsin isterim fareyle seçmek istemiyorum bunun ciğerin bir şifre varmıdır

Notice that I didn't have to override Equals, GetHashCode in neither of the classes. I güç use this comparer in any object that implements ICustom without having to rewrite the comparison logic.

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

I now need to do distinct on a collections of some of these objects. I have the following code over and over for each of the child classes:

in case a particular hash value was not encountered before, the corresponding object makes its way into the result

is time to be happy. I’ve read this post and if I could I desire to suggest you few C# IEqualityComparer nerelerde kullanılıyor interesting things

Comparer name prefix — allows you to specify a prefix that will be used in the name of the generated comparer class.

The instructions and examples given here address the use of the feature in C#. For more information about other languages, refer to corresponding topics in the ReSharper by C# IEqualityComparer nedir language section.

It looks like the generic version of this interface performs the same function but is used for Dictionary) collections.

So now we know how to use IEqualityComparer with C# IEqualityComparer nedir LINQ and hamiş make a mess of it. I hope this helps. However, I would like to push our ActorComparer a little C# IEqualityComparer Nasıl Kullanılır further. Bey you might know, LINQ has an OrderBy(..) extension method that allows us C# IEqualityComparer nedir to sort a collection according to some key.

If things don't seem to be working (such birli 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).