Için basit anahtar C# IStructuralEquatable Kullanımı örtüsünü

Için basit anahtar C# IStructuralEquatable Kullanımı örtüsünü

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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 bey a key in a dictionary) it gönül murder performance in one foul swoop.

It differs from reference equality, which indicates that two object references are equal because they reference the same physical object.

LBushkinLBushkin 131k3333 gold badges217217 silver badges265265 bronze badges 11 8 Why dirilik't you just specify an IEqualityComparer yourself that does this? What does the IStructuralEquatable interface add to this?

You generic method başmaklık a type parameter T but the type is hamiş part of the signature of the function so how is T supposed to be used in the function? Anyway, you yaşama use .Safi tuples or anonymous types to create hash codes by combining values but I am derece sure this answers your question.

If two objects compare bey equal, the GetHashCode method for each object must return the same value. However, if two objects do hamiş compare as equal, the GetHashCode methods for the two object do derece have to return different values.

Aynı emeklemi her bir iterasyon bâtınin bir task oluşturup yapabiliyorken neden Muvazi bir döngü oluşturmalıyız?

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.

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 davranışlemci üzerinde maliyeti vardır ve çok kesik devam eden fiillemler muhtevain bir task yapılandırmak genel anlamda elan yavaş çdüzenışan uygulamalara menşe olur.

To achieve this, employee objects with matching SSN properties would be treated as logically equal, even if they were hamiş structurally equal. Share Improve this answer Follow

IStructuralEquatable is used with arrays to determine whether the arrays are structurally equal. The StructuralEqualityComparer.Equals method is used for this purpose.

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

Burada özen ederseniz eğer ms.x ve ms.y değnöbetmeyeceğinden dolayı bir Deep Copy alay konusudur. Eğer C# IStructuralEquatable Temel Özellikleri referans tipli örgülar olsalardı bayağıdaki kabilinden bir sonuç elde edilecekti ve Shallow Copy kelime konusu olacaktı.