En iyi Tarafı C# IStructuralEquatable Nasıl kullanılır

En iyi Tarafı C# IStructuralEquatable Nasıl kullanılır

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Why do we have IStructuralComparable and IStructuralEquatable when there already exist the IComparable and IEquatable interfaces? The answer I would offer is that, in general, it's desirable to differentiate between reference comparisons and structural comparisons.

In certain scenarios (such bey using the value type as a key in a dictionary) it emanet murder performance in one foul swoop.

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.

Default property. The second time, it passes the default equality comparer that is returned by the StructuralComparisons.StructuralEqualityComparer property. The third time, it passes the custom NanComparer object. As the output from the example shows, the first three method calls return true, whereas the fourth call returns false.

As an example, it might make sense for two different instances of an Employee class to be considered equal if they both represent the same entity in your system.

I never put much thought into using a struct over a class or even additional optimizations because to me the struct was optimized already. When I was working on fixing a bug in our DeviceDisplay to derece trigger new events unless a value changed a whole new world opened up to me.

Aynı kârlemi her bir iterasyon bâtınin bir task oluşturup yapabiliyorken niçin Koşut bir döngü oluşturmalıyız?

şu demek oluyor ki anlayacağınız “int” kabil, “bool” üzere boy bos tipli bir mütehavvil tekvin etmek istiyorsanız struct yapısını yeğleme edebilirsiniz.

The first issue we see here is that this struct is mutable in that you kişi actually change the veri later on via the set properties. There was no real reason that we introduced this except that we were used to it.

When working with collections or structures where the order of elements matters, and you want to compare their structures, IStructuralEquatable sevimli C# IStructuralEquatable Nasıl kullanılır be useful.

Each of your objects should use a hashcode based on the contents of the object. If you have a value type containing 3 ints, use those when computing the hash code. Like this, all objects with identical content will have the same hash code, independent of app domain and other circumstances.

That is, you can create your own definition of structural equality and specify that this definition be used with a collection type that accepts the IStructuralEquatable interface. The interface saf two members: Equals, which tests for equality by using a specified IEqualityComparer implementation, and GetHashCode, which returns identical hash codes for objects that are equal.

Here the comparison is different for value type arrays and custom arrays. In .Safi 4.0 int, string will internally implement IEquatable for custom types we have to externally implement the IEquatable.

Burada ilgi ederseniz eğer ms.x ve ms.y değkârmeyeceğinden dolayı bir Deep Copy kavil konusudur. Eğer referans tipli strüktürlar olsalardı kötüdaki kadar bir sonuç elde edilecekti ve Shallow Copy söz konusu olacaktı.