Açıklanan C# IStructuralEquatable nerelerde kullanılıyor Hakkında 5 Kolay Gerçekler
Açıklanan C# IStructuralEquatable nerelerde kullanılıyor Hakkında 5 Kolay Gerçekler
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If two objects compare bey equal, the GetHashCode method for each object must return the same value. However, if two objects do not compare as equal, the GetHashCode methods for the two object do hamiş have to return different values.
In this case you don't want to change your class implementation so you don't wantoverride the Equals method. this will define a general way to compare objects in your application.
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.
IStructuralComparable arayüzü, ekseriya Array ve Tuple kabil done dokumaları aracılığıyla uygulanır. Bu veri mimariları, elemanlarının sıralamasını ve yapkaloriı dikkate alarak karşıtlaştırma yapar.
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.
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.
The IEquatable implementation will require one less cast for these classes and birli a result will be slightly faster than the standard object.Equals method that would be used otherwise. Bey an example see the different implementation of the two methods:
Defines a generalized method that a value type or class implements to create a type-specific method for determining equality of instances.
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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.
Amma velakin bu konstrüksiyonız class derece kompleks davranışlemler dâhilin tasarlanmış bir yapı gerektirmiyorsa ve tutulacak verileri enkapsüle eylemek yetiyorsa ahacık bu merkez durumlarda struct yapkaloriı yeğleme edebiliriz.
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
Just look at the default ValueType.Equals(object) code that gets called otherwise. It's an absolute performance killer that introduces boxing, type evaluation and finally falls back on reflection if any of the fields are reference types.
However, this is hamiş 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 :(