En iyi Tarafı C# IStructuralEquatable nerelerde kullanılıyor
En iyi Tarafı C# IStructuralEquatable nerelerde kullanılıyor
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If two objects compare birli equal, the GetHashCode method for each object must return the same value. However, if two objects do derece compare bey equal, the GetHashCode methods for the two object do derece have to return different values.
In certain scenarios (such kakım using the value type as a key in a dictionary) it hayat murder performance in one foul swoop.
If you want to implement IEquatable in a class hierarchy you can use the following pattern. It prevents derived (including sibling) classes from being equal.
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I'm amazed that the most important reason is not mentioned here. IEquatable was introduced mainly for structs for two reasons:
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 hamiş 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.
We birey also make our own container play well with these other containers by implementing these interfaces.
The first issue we see here is that this struct is mutable in that you birey C# IStructuralEquatable nedir actually change the veri later on via the takım properties. There was no real reason that we introduced this except that we were used to it.
When working with collections or structures where the order of elements matters, and you want to compare their structures, IStructuralEquatable kişi be useful.
To achieve this, employee objects with matching SSN properties would be treated as logically equal, even if they were hamiş 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.
Here the comparison is different for value type arrays and custom arrays. In .Kupkuru 4.0 int, string will internally implement IEquatable for custom types we have to externally implement the IEquatable.
3 feature called Tuple Equality! That is right, you gönül create a ValueTuple and simply compare them birli they are super optimized, don't create any objects, and reduce this to a single line of code!