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.
Bu sayede, data konstrüksiyonlarının karınindeki verilerin sıralanması yahut mukabillaştırılması fiillemleri özelleştirilebilir ve denetleme 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:
Tasarmızın yukarıdaki satırlarında da bahsettiğimiz kabilinden struct C#’ta value type yaratabileceğimiz bünyedır.
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45IStructuralEquatable seObj = x bey IStructuralEquatable; 64IStructuralEquatable seObj = obj kakım IStructuralEquatable;
What does IEquatable buy you, exactly? The only reason I gönül see it being useful is when creating a generic type and forcing users to implement and write a good equals method.
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.
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If you read this entire post and are thinking wow that is a lot of code and steps to remember then do derece fear because Dustin told me and showed me that Visual Studio will generate all of this for you!!!!! Check this out:
C# IStructuralEquatable Defines methods to support the comparison of objects for structural equality.
That is, you birey 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 başmaklık 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.
Just look at the default ValueType.Equals(object) code that gets called otherwise. It's an absolute performance killer that introduces boxing, type evaluation and finally falls back on reflection if any of the fields are reference types.
Being able to specify IStructuralEquatable/IStructuralComparable in such cases is actually useful. It would also be inconvenient to pass a C# IStructuralEquatable Kullanımı TupleComparer or ArrayComparer everywhere you want to apply this type of comparison. The two approaches are derece mutually exclusive.