En son beş C# IStructuralEquatable Kullanımı Kentsel haber
En son beş C# IStructuralEquatable Kullanımı Kentsel haber
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Is Légal’s reported “psychological trick” considered fair play or unacceptable conduct under FIDE rules?
Bu sayede, data bünyelarının karınindeki verilerin sıralanması veya karşıtlaştırılması ustalıklemleri özelleştirilebilir ve arama 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:
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. Bey the output from the example shows, the first three method calls return true, whereas the fourth call returns false.
Let us derece forget about additional operators and hamiş just relying on Equals. We kişi implement the == and != operators easily:
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 hayat see it being useful is when creating a generic type and forcing users to implement and write a good equals method.
Defines a generalized method that a value type or class implements to create a type-specific method for determining equality of instances.
The reason why you need the IStructuralEquatable is for defining a new way of comparision that would be right for all the objects .
Bu C# IStructuralEquatable Kullanımı örnekte, articles1 ve articles2 dizileri aynı makale başlangıçlıklarına aynı sırada ehil olduğundan, CompareTo metodu 0 döndürerek bu dizilerin konstrüktif olarak müsavi bulunduğunu belirtir.
To achieve this, employee objects with matching SSN properties would be treated kakım logically equal, even if they were derece structurally equal. Share Improve this answer Follow
The example on MSDN gives part of the answer here; it seems to be useful for heterogeneous equality, rather than homogeneous equality - i.e. for testing whether two objects (/values) of potentially different types
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.
Being able to specify IStructuralEquatable/IStructuralComparable in such cases is actually useful. It would also be inconvenient to pass a TupleComparer or ArrayComparer everywhere you want to apply this type of comparison. The two approaches are hamiş mutually exclusive.