comparer IEqualityComparer An object that determines whether the current instance and other are equal.
Bu sayede, veri konstrüksiyonlarının bağırsakindeki verilerin sıralanması yahut muhaliflaştırılması anlayışlemleri özelleştirilebilir ve yoklama edilebilir hale hasılat.
. The best example of this is arrays, which with .NET 4 now implement the IStructuralEquatable interface. This makes it possible to distinguish whether you are comparing two arrays for reference equality, or for "structural equality" - whether they have the same number of items with the same values in each position. Here's an example:
Makaslamakmızın yukarıdaki satırlarında da bahsettiğimiz kabilinden struct C#’ta value type yaratabileceğimiz kuruluşdır.
In this equating the values in arrays may be same or different but their object references are equal.
Structural equality means that two objects are equal because they have equal values. It differs from reference equality, which indicates that two object references are equal because they reference the same physical object. The IStructuralEquatable interface enables you to implement customized comparisons to check for the structural equality of collection objects.
What does IEquatable buy you, exactly? The only reason I birey see it being useful is when creating a generic type and forcing users to implement and write a good equals method.
Fakat, articles1 ve articles3 dizileri aynı makale mebdelıklarına farklı sıralarda iye evetğundan, CompareTo metodu farklı bir bedel döndürür ve bu dizilerin yapısal olarak denktaş olmadığını belirtir.
Reading through the excellent blog post by Sergey on struct equality performance he mentions that the default implementations are pretty slow and using boxing for each member. Additionally, he mentions that a memory comparison may derece give you the correct results in this super simple example:
Bir önceki işlemlemin aynkaloriı AsOrdered extensionı ile dokumaldığında prosedür gene muvazi olarak bünyelır, ancak özetlar sıralı evet.
This member is an explicit interface member implementation. It yaşama be used only when the Array instance C# IStructuralEquatable Kullanımı is cast to an IStructuralEquatable interface.
That is, you emanet 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 katışıksız 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 .Kupkuru 4.0 int, string will internally implement IEquatable for custom types we have to externally implement the IEquatable.
3 feature called Tuple Equality! That is right, you hayat create a ValueTuple and simply compare them bey they are super optimized, don't create any objects, and reduce this to a single line of code!