Açıklanan C# IStructuralEquatable Kullanımı Hakkında 5 Kolay Gerçekler

Açıklanan C# IStructuralEquatable Kullanımı Hakkında 5 Kolay Gerçekler

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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 .

Other types which implement structural equality/comparability include tuples and anonymous types - which both clearly benefit from the ability to perform comparison based on their structure and content. A question you didn't ask is:

As far kakım I see this is only exposed through the StructuralComparisons class. The only way I can figure out to make this useful is to make a StructuralEqualityComparer helper class bey follow:

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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 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.

In my implementation I delegated the task of calculating hash codes to the internal array. While testing it, to my great surprise, I found that my two different arrays had the same structural hash code

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)

Task oluşturmanın meselelemci üzerinde maliyeti vardır ve çok kısaltarak süren hizmetlemler sinein bir task kurmak genelde henüz yavaş çkızılışan uygulamalara vesile evet.

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

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

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However, this is not so great if you are using the struct in a dictionary bey my good friend Dustin mentioned to me because a Dictionary will always use the object version of Equals, which falls back to boxing :(