C# IStructuralEquatable Kullanımı Temel Açıklaması

Wiki Article

If equality is not needed for the derived class you hayat skip IEquatable but you need to override the CanEqual to prevent it being equal with base classes (unless of course they should be considered equal).

Important Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

That is right! When we override Equals we must also override and implement GetHashCode. I am no HashCode expert, but in the same article from Sergey is a snippet of using a ValueTuple to simplify this entire call to 1 line of code just like our fancy ValueTuple Equality above.

As far birli I see this is only exposed through the StructuralComparisons class. The only way I birey figure out to make this useful is to make a StructuralEqualityComparer helper class bey follow:

Your browser isn’t supported anymore. Update it to get the best YouTube experience and our latest features. Learn more

– Royi Namir Commented Mar 3, 2012 at 18:04 @RoyiNamir user844541's answer is correct, but maybe it is still hard for you to understand without a concrete example, if you are familiar with IEqualityComparer and how it is used by Linq's Distinct(), then after check the source code to see how it implement IStructuralEquatable on referencesource.microsoft.com/#mscorlib/system/collections/…, then you will see how it work.

1 My understanding is that it's used for collection like types, and encapsulates C# IStructuralEquatable Temel Özellikleri the structural part of the comparison, but leaved the comparison of the elements to a comparer passed in by the user. But I'm hamiş really sure if I really got it.

Fakat, articles1 ve articles3 dizileri aynı makale temellıklarına farklı sıralarda iye olduğundan, CompareTo metodu farklı bir bedel döndürür ve bu dizilerin strüktürel olarak denktaş olmadığını belirtir.

(doesn't violate documentation), but it is clearly hamiş kakım good as it would be if 0 were replaced with i. Also there's no reason to loop if the code were just going to use a single value from the array.

When working with collections or structures where the order of elements matters, and you want to compare their structures, IStructuralEquatable dirilik be useful.

C# IStructuralComparable Determines whether the current collection object precedes, occurs in the same position kakım, or follows another object in the sort order.

Now that our struct is immutable the actual issue comes up when you need to compare these values. When I started to write the code to fix the bug I just decided that "hey I have the old values, I yaşama just compare each of them":

There is no need for an equality operator that accepts different types. That should derece even compile. So this is a very weak excuse for having a non-generic interface that works with objects.

Being able to specify IStructuralEquatable/IStructuralComparable in such cases is actually useful. It would also be inconvenient to pass a TupleComparer or ArrayComparer everywhere you want to apply this type of comparison. The two approaches are derece mutually exclusive.