Greatest Kılavuzu C# IStructuralEquatable Nasıl kullanılır için

Greatest Kılavuzu C# IStructuralEquatable Nasıl kullanılır için

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If you want to implement IEquatable in a class hierarchy you güç use the following pattern. It prevents derived (including sibling) classes from being equal.

Does anyone know what happens if you do hamiş implement iequtalable when using generic collections? 2

It is used by the third example birli an argument to the Equals(Object, IEqualityComparer) method of the IStructuralEquatable interface that tuples implement. It compares two Double or two Single values by using the equality operator. It passes values of any other type to the default equality comparer.

If two objects compare birli equal, the GetHashCode method for each object must return the same value. However, if two objects do hamiş compare bey equal, the GetHashCode methods for the two object do derece have to return different values.

The IEquatable implementation will require one less cast for these classes and as a result will be slightly faster than the standard object.Equals method that would be used otherwise. As an example see the different implementation of the two methods:

I've noticed these two interfaces, and several associated classes, have been added in .NET 4. They seem a C# IStructuralEquatable Nasıl kullanılır bit superfluous to me; I've read several blogs about them, but I still dirilik't figure out what problem they solve that was tricky before .Safi 4.

The first issue we see here is that this struct is mutable in that you yaşama actually change the veri later on via the kaş properties. There was no real reason that we introduced this except that we were used to it.

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

Defines methods to support the comparison of objects for structural equality. Structural equality means that two objects are equal because they have equal values.

The IStructuralEquatable interface supports only custom comparisons for structural equality. The IStructuralComparable interface supports custom structural comparisons for sorting and ordering.

However, this is derece so great if you are using the struct in a dictionary birli my good friend Dustin mentioned to me because a Dictionary will always use the object version of Equals, which falls back to boxing :(