En son beş C# IStructuralEquatable Kullanımı Kentsel haber
En son beş C# IStructuralEquatable Kullanımı Kentsel haber
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However, this is an implementation detail and unless you want to rely on this in your code you cannot create a stable hash code provide an object that implements IStructuralEquatable.
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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 time, it passes the default equality comparer that is returned by the EqualityComparer.
Ovamızın fevkdaki satırlarında da bahsettiğimiz kadar struct C#’ta value type yaratabileceğimiz bünyedır.
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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 as equal, the GetHashCode methods for the two object do hamiş have to return different values.
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.
We hayat also make our own container play well with these other containers by implementing these interfaces.
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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.
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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.
The Equals method supports custom structural comparison of array and tuple objects. This method in turn calls the comparer object's C# IStructuralEquatable nerelerde kullanılıyor IEqualityComparer.Equals method to compare individual array elements or tuple components, starting with the first element or component.