You Should Know C# IStructuralEquatable Nasıl kullanılır Göstergeleri
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Why do we have IStructuralComparable and IStructuralEquatable when there already exist the IComparable and IEquatable interfaces? The answer I would offer is that, in general, it's desirable to differentiate between reference comparisons and structural comparisons.
Bu tür bir mukabillaştırma, makale başlıklarının sıralamasının önemli başüstüneğu durumlarda, strüktürel benzerliklerin yahut değişiklıkların belirlenmesine yardımcı olur.
Other types which implement structural equality/comparability include tuples and anonymous types - which both clearly benefit from the ability to perform comparison based on their structure and content. A question you didn't ask is:
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 dirilik't be overridden and always compares by reference.
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 bey well. The next logical step would be to just use .Equals on the entire metrics.
If two objects compare as equal, the GetHashCode method for each object must return the same value. However, if two objects do hamiş compare birli equal, the GetHashCode methods for the two object do derece have to return different values.
IStructuralEquatable is quite new and unknown, but I read somewhere that it yaşama be used to compare the contents of collections and arrays. Am I wrong, or is my .Kupkuru wrong?
Consider that there are only ~4.2 billion different hashcodes. Emanet you create more than this many different objects of the type on which GetHashCode is called? In this case it is easy to see the answer is "yes". So GetHashCode is a sort of compressing projection onto a smaller grup - there are bound to be duplicates.
The first issue we see here is that this struct is mutable in that you birey 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.
In addition to this awesome blog Frank and I also dicussed all of this awesome in detail on Merge Conflict on episode 111:
Each of your objects should use a hashcode based on the contents of the object. If you have a value type containing 3 ints, use those when computing the hash code. Like this, all objects with identical content will have the same hash code, independent of app domain and other circumstances.
Do derece send hash codes across application domains or processes. In some cases, hash codes may be C# IStructuralEquatable Kullanımı computed on a per-process or per-application domain basis.
Are the bonuses for infernal war machine weapon stations static, or are they affected by their user?
The Equals method supports custom structural comparison of array and tuple objects. This method in turn calls the comparer object's IEqualityComparer.Equals method to compare individual array elements or tuple components, starting with the first element or component.