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?
In certain scenarios (such bey using the value type birli a key in a dictionary) it hayat murder performance in one foul swoop.
. 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:
Bey far birli I see this is only exposed through the StructuralComparisons class. The only way I gönül figure out to make this useful is to make a StructuralEqualityComparer helper class kakım follow:
Ee kavlükarar gelimi struct strüktürsında da new operatörünü kullanırsak eğer he ilişkin strüktürdan bir nesne üretilecektir ama struct bir ölçü tipli değişken bünyesında başüstüneğundan dolayı o nesne belleğin Stack kısmında koruma edilecektir.
The generic tuple classes (Tuple, Tuple, Tuple, and so on) and the Array class provide explicit implementations of the IStructuralEquatable interface. By casting (in C#) or converting (in Visual Basic) the current instance of an array or tuple to an IStructuralEquatable interface value and providing your IEqualityComparer implementation bey an argument to the Equals method, you birey define a custom equality comparison for the array or collection.
1 My understanding is that it's used for collection like types, and encapsulates the structural part of the comparison, but leaved the comparison of the elements to a comparer passed in by the user. But I'm derece really sure if I really got it.
This is very disappointing behaviour from Microsoft; I'm now wondering if I should review the list of cases I've filed and see if other ones I've submitted have been removed...
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In addition to this awesome blog Frank and I also dicussed all of this awesome in detail on Merge Conflict on episode 111:
Each of your objects should use a hashcode based on the contents of the object. If you have a value type containing 3 ints, use those when computing the hash code. Like this, all objects with identical content will have the same hash code, independent of app domain and other circumstances.
Defines methods to support the comparison of objects for structural equality. C# IStructuralEquatable Kullanımı Structural equality means that two objects are equal because they have equal values.
GetHashCode does derece return unique values for instances that are derece equal. However, instances that are equal will always return the same hash code.
While writing my own immutable ByteArray class that uses a byte array internally, I implemented the IStructuralEquatable interface.