Hakkında C# IStructuralEquatable nerelerde kullanılıyor

Hakkında C# IStructuralEquatable nerelerde kullanılıyor

Blog Article

comparer IEqualityComparer An object that determines whether the current instance and other are equal.

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

Let us not forget about additional operators and not just relying on Equals. We kişi implement the == and != operators easily:

If two objects compare bey equal, the GetHashCode method for each object must return the same value. However, if two objects do hamiş compare as equal, the GetHashCode methods for the two object do not have to return different values.

Aynı kârlemi her bir iterasyon sinein bir task oluşturup yapabiliyorken münasebet Muvazi bir döngü oluşturmalıyız?

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.

Ray BooysenRay Booysen 29.6k1414 gold badges8686 silver badges111111 bronze badges 6 so when you are dealing with objects, is == assumed to only mean the exact same memory address (same instance)

If you read this entire post and are thinking wow that is a lot of code and steps to remember then do not fear because Dustin told me and showed me that Visual Studio will generate all of this for you!!!!! Check this out:

This member is an explicit interface member implementation. It sevimli be used only when the Array instance is cast to an IStructuralEquatable interface.

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

GetHashCode does derece return unique values for instances that are derece equal. However, instances that are equal will always C# IStructuralEquatable Temel Özellikleri return the same hash code.

Collaborate with us on GitHub The source for this content emanet be found on GitHub, where you güç also create and review issues and pull requests. For more information, see our contributor guide.