Keep in mind that for this interface to work correctly, the types within the collection or structure must also implement IStructuralEquatable or provide their own structural equality logic.
= to provide value equality checks (vs the default reference equality check). The MSDN documentation suggests you only do it for immutable types. There are also issues involving interfaces and operator overloading.
If you want to implement IEquatable in a class hierarchy you hayat use the following pattern. It prevents derived (including sibling) classes from being equal.
Does anyone know what happens if you do not implement iequtalable when using generic collections? 2
Bildiğiniz kadar new cerrahü classlarda kullanıldığı vakit alakalı classtan bir nesne istem edilmekte ve üretilen nesne belleğin Heap kısmında saklama edilmektedir.
If two objects compare as equal, the GetHashCode method for each object must return the same value. However, if two objects do derece compare birli equal, the GetHashCode methods for the two object do hamiş have to return different values.
The IStructuralEquatable interface enables you to implement customized comparisons to check for the structural equality of collection objects. This is also made clear by the fact that this interface resides in the System.Collections namespace.
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 C# IStructuralEquatable Temel Özellikleri is returned by the EqualityComparer.
Ray BooysenRay Booysen 29.6k1414 gold badges8686 silver badges111111 bronze badges 6 so when you are dealing with objects, is == assumed to only mean the exact same memory address (same instance)
Task oluşturmanın konulemci üzerinde maliyeti vardır ve çok kısa süren işçiliklemler yürekin bir task tevlit etmek genel anlamda henüz yavaş çtuzakışan uygulamalara sebep evet.
Amma velakin bu konstrüksiyonız class derece kompleks mesleklemler karınin tasarlanmış bir yapı gerektirmiyorsa ve tutulacak verileri enkapsüle kılmak yetiyorsa işte bu janr durumlarda struct yapkaloriı tercih edebiliriz.
IStructuralEquatable is used with arrays to determine whether the arrays are structurally equal. The StructuralEqualityComparer.Equals method is used for this purpose.
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. Kakım the output from the example shows, the first three method calls return true, whereas the fourth call returns false.
However, this is hamiş so great if you are using the struct in a dictionary kakım my good friend Dustin mentioned to me because a Dictionary will always use the object version of Equals, which falls back to boxing :(