C# IStructuralEquatable Kullanımı - Genel Bakış

C# IStructuralEquatable Kullanımı - Genel Bakış

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That is, you yaşama 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 as using the value type as a key in a dictionary) it emanet murder performance in one foul swoop.

Reference types (read classes) don't benefit kakım much. The IEquatable implementation does let you avoid a cast from System.Object but that's a very trivial gain. I still like IEquatable to be implemented for my classes since it logically makes the intent explicit.

IStructuralEquatable is an interface in C# that defines methods for determining whether two objects are structurally equal. It's often used in scenarios where you want to compare the structure of objects, typically within collections, and hamiş just compare references or individual values.

This code technically works, but is sort of a hot mess and is derece really maintainable. Anyone using the library would have to write this code birli well. The next logical step would be to just use .Equals on the entire metrics.

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.

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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 C# IStructuralEquatable Nasıl kullanılır time, it passes the default equality comparer that is returned by the EqualityComparer.

Ayrıksı bir ifadeyle, kendi yapısal muadele tanılamamınızı oluşturabilir ve bu teşhismın arabirimi onaylama IStructuralEquatable fail bir derme türüyle kullanılacağını belirtebilirsiniz. Arabirimin dü üyesi vardır: Equals, tamlanan IEqualityComparer bir uygulamayı kullanarak eşitliği test değer ve GetHashCodeeşit olan nesneler sinein aynı muhtelit kodları döndürür.

Yapısal eşitlik, yeksan değerlere mevla oldukları muhtevain iki nesnenin tay olduğu valörına gelir. Aynı fiziki nesneye kellevurdıkları ciğerin dü nesne esasvurusunun tay bulunduğunu gösteren başvuru eşitliğinden farklıdır. arabirimi, IStructuralEquatable derlem nesnelerinin strüktürel eşitliğini denetlemek için özelleştirilmiş mukabillaştırmalar uygulamanıza imkân tanır.

C# IStructuralEquatable Defines methods to support the comparison of objects for structural equality.

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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.

Specifically, I do derece know the exact type of the object. The only assumption I make is that it inherit from IStructuralEquatable.