En C# IEqualityComparer nerelerde kullanılıyor Sırları

En C# IEqualityComparer nerelerde kullanılıyor Sırları

Blog Article

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

ちょっと横道にそれますが、上記サンプルコード（構造体の例など）にちょっと見慣れない形式のコードがいくつか見受けられます。

If a reference is no longer publicly available, should you include the proofs of the results you cite from it?

List sınıfı tanımlanırken T tip bileğişçilikkenini allıkır. Kısaca listenin muhteviyatında ne türden nesne yada değkârkenlerin olacağını belirler.

The first is the idea of precise equality. Given two references to objects, do the two references point to the same location in memory? Programming languages are suited for this kind of comparison, and .NET comes with many prebuilt operators to handle this case.

The comparer will validate that prop1 is the same (and add B to the pool), then validate that prop2 is the same (and add C to the pool), and when it validates prop3, even though they're different, since both B and C are in the pool, the comparer will consider them to be the same.

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:

We’ll write a classic implementation of IEqualityComparer class. In our example, we need to compare customers. Two customers are distinct if your first char Name is different.

So what happens when it comes time to actually deduce the type argument? We have two candidates: Position and BaseClass. Both satisfy the stated bounds. Position satisfies the first bound because C# IEqualityComparer nerelerde kullanılıyor it is identical to the first bound, and satisfies the second bound because it is smaller than the second bound.

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

Hayat apophatic theology offer a coherent resolution to the "sorun of the creator of God"? more hot questions

Upgrade to Microsoft C# IEqualityComparer Nasıl Kullanılır Edge to take advantage of the latest features, security updates, and technical support.

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

Or if you need to change how the comparer sorts, that you have to change them all? Lets say you do that comparison in 500 places, some in 3rd party code, now you have a maintenance nightmare.