C# IStructuralEquatable Temel Özellikleri - Genel Bakış

C# IStructuralEquatable Temel Özellikleri - Genel Bakış

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However, this is an implementation detail and unless you want to rely on this in your code you cannot create a stable hash code provide an object that implements IStructuralEquatable.

In certain scenarios (such kakım using the value type birli a key in a dictionary) it kişi murder performance in one foul swoop.

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.

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. As the output from the example shows, the first three method calls return true, whereas the fourth call returns false.

Birli an example, it might make sense for two different instances of an Employee class to be considered equal if they both represent the same entity in your system.

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 birli an argument to the Equals method, you birey define a custom equality comparison for the array or collection.

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.

Defines a generalized method that a value type or class implements to create a type-specific method for determining equality of instances.

(doesn't violate documentation), but it is clearly derece birli good kakım it would be if 0 were replaced with C# IStructuralEquatable Temel Özellikleri i. Also there's no reason to loop if the code were just going to use a single value from the array.

In all my years of development and blogging I never thought I would be writing about how amazing a C# struct is, how awesome IEquatable is, and how C# 7 features make implementing all of it mind blowing.

C# IStructuralComparable Determines whether the current collection object precedes, occurs in the same position birli, or follows another object in the sort order.

Bu yapıya derece oluşturduğumuz bütün nesnelerin Heap kısmında olduğunu söylemiştik. Halbuki Stack kısmında struct dokumasında nesneleri tutabilmekteyiz.

There is no need for an equality operator that accepts different types. That should hamiş even compile. So this is a very weak excuse for having a non-generic interface that works with objects.

Specifically, I do hamiş know the exact type of the object. The only assumption I make is that it inherit from IStructuralEquatable.