C# IStructuralEquatable nerelerde kullanılıyor Aptallar için

C# IStructuralEquatable nerelerde kullanılıyor Aptallar için

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It's normally expected that if you implement IEquatable.Equals you will also override Object.Equals to be consistent. In this case how would you support both reference and structural equality?

In certain scenarios (such bey using the value type bey a key in a dictionary) it hayat murder performance in one foul swoop.

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.

Equals and object.ReferenceEquals. Equals is meant to be overridden for whatever sort of comparison makes the most sense for a given type, whereas ReferenceEquals güç't be overridden and always compares by reference.

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.

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.

If those objects do not contain equality/hashcode methods that satisfy that contract, you will have to wrap them and provide correct implementations for those methods yourself in the wrapper.

Defines a generalized C# IStructuralEquatable Kullanımı method that a value type or class implements to create a type-specific method for determining equality of instances.

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Bu örnekte, articles1 ve articles2 dizileri aynı makale mebdelıklarına aynı sırada ehil olduğundan, CompareTo metodu 0 döndürerek bu dizilerin yapısal olarak denktaş olduğunu belirtir.

To achieve this, employee objects with matching SSN properties would be treated kakım logically equal, even if they were not structurally equal. Share Improve this answer Follow

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.

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. Kakım the output from the example shows, the first three method calls return true, whereas the fourth call returns false.

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