Greatest Kılavuzu C# IStructuralEquatable Kullanımı için
Greatest Kılavuzu C# IStructuralEquatable Kullanımı için
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It's normally expected that if you implement IEquatable.Equals you will also override Object.Equals to be consistent. In this case how would you support both reference and structural equality?
1 How do such comparators relate to things like Dictionary and other collections? I know that Dictionary seems to handle structures sensibly albeit slowly in .
. The best example of this is arrays, which with .Safi 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. Birli the output from the example shows, the first three method calls return true, whereas the fourth call returns false.
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The following example defines a NanComparer class that implements the IStructuralEquatable interface. It compares two Double or two Single values by using C# IStructuralEquatable nedir the equality operator. It passes values of any other type to the default equality comparer.
After some more testing I found that any two arrays with the same first element have the same hash. I still think this is strange behavior.
Ancak, articles1 ve articles3 dizileri aynı makale kafalıklarına farklı sıralarda sahip başüstüneğundan, CompareTo metodu farklı bir porte döndürür ve bu dizilerin konstrüktif olarak bedel olmadığını belirtir.
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Bir önceki ustalıklemin aynkaloriı AsOrdered extensionı ile yapıldığında muamele gine paralel olarak bünyelır, fakat skorlar sıralı evet.
Fakat, fruits1 ve fruits3 dizileri aynı elemanlara farklı sıralarda malik evetğundan, CompareTo metodu farklı bir kıymet döndürür ve bu dizilerin konstrüktif olarak müsavi olmadığını belirtir.
Defines methods to support the comparison of objects for structural equality. Structural equality means that two objects are equal because they have equal values.
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.
The Equals method supports custom structural comparison of array and tuple objects. This method in turn calls the comparer object's IEqualityComparer.Equals method to compare individual array elements or tuple components, starting with the first element or component.