Definitive Guide C# IStructuralEquatable Temel Özellikleri için
Definitive Guide C# IStructuralEquatable Temel Özellikleri için
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That is, you can create your own definition of structural equality and specify that this definition be used with a collection type that accepts the IStructuralEquatable interface.
In certain scenarios (such birli using the value type birli a key in a dictionary) it yaşama murder performance in one foul swoop.
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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.
Kakım 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.
– Royi Namir Commented Mar 3, 2012 at 18:04 @RoyiNamir user844541's answer is correct, but maybe it is still hard for you to understand without a concrete example, if you are familiar with IEqualityComparer and how it is used by Linq's Distinct(), then after check the source code to see how it implement IStructuralEquatable on referencesource.microsoft.com/#mscorlib/system/collections/…, then you will see how it work.
The IStructuralEquatable interface enables you to implement customized comparisons to check for the structural equality of collection objects. This is also made clear by the fact that this interface resides in the System.Collections namespace.
When an implementer overrides the virtual Equals method in a struct, the purpose is to provide a more efficient means of performing the value equality check and optionally to base the comparison on some subset of the struct's field or properties.
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)
Collaborate with us on GitHub The source for this content emanet be found on GitHub, where you birey also create and review issues and pull requests. For more information, see our contributor guide.
Ancak, fruits1 ve fruits3 dizileri aynı elemanlara farklı sıralarda malik olduğundan, CompareTo metodu farklı bir mesabe döndürür ve bu dizilerin konstrüktif olarak müsavi olmadığını belirtir.
Do derece send hash codes across application domains or processes. In some cases, hash codes may be computed on a per-process or per-application domain basis.
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Collaborate with us on GitHub The source for this content can be found on GitHub, where C# IStructuralEquatable Kullanımı you güç also create and review issues and pull requests. For more information, see our contributor guide.