Için basit anahtar C# IStructuralEquatable nedir örtüsünü

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

= to provide value equality checks (vs the default reference equality check). The MSDN documentation suggests you only do it for immutable types. There are also issues involving interfaces and operator overloading.

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.

Daniel A.A. PelsmaekerDaniel A.A. Pelsmaeker 49.2k2121 gold badges112112 silver badges160160 bronze badges 5 In addition to answers which point to duplicate hashcodes kakım is documented behavior, some reasoning and reflection would also lead you to the same conclusion.

This code technically works, but is sort of a hot mess and is not really maintainable. Anyone using the library would have to write this code as well. The next logical step would be to just use .Equals on the entire metrics.

Structural equality means that two objects are equal because they have equal values. It differs from reference equality, which indicates that two object references are equal because they reference C# IStructuralEquatable nerelerde kullanılıyor the same physical object. The IStructuralEquatable interface enables you to implement customized comparisons to check for the structural equality of collection objects.

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.

I've noticed these two interfaces, and several associated classes, have been added in .NET 4. They seem a bit superfluous to me; I've read several blogs about them, but I still dirilik't figure out what sorun they solve that was tricky before .NET 4.

The reason why you need the IStructuralEquatable is for defining a new way of comparision that would be right for all the objects .

Bu örnekte, articles1 ve articles2 dizileri aynı makale çıbanlıklarına aynı tam ehil olduğundan, CompareTo metodu 0 döndürerek bu dizilerin strüktürel olarak eşit olduğunu belirtir.

Programlama dillerinde en mühim OOP(Object Oriented Programing) gestaltlarından olan class binasına bakarak elan çarpık çurpuk düzeyde anlayışlemler gerçekleştirmemizi sağlayan ve mukannen bir ekip kısıtlamaları birlikte çitndıran struct yapısını C# diline özel ele alacağız.

Defines methods to support the comparison of objects for structural equality. Structural equality means that two objects are equal because they have equal values.

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.

While writing my own immutable ByteArray class that uses a byte array internally, I implemented the IStructuralEquatable interface.