.net/c# HashSet to add unique objects

Little scum · Posted on 9/7/2017 11:12:10 AM

.NET 3.5 includes a new collection class in the System.Collections.Generic namespace: HashSet<T>. This collection class contains an unordered list of unique items. This set is called a "set". Set is a reserved word, so the class has another name, HashSet<T>. The name is easy to understand because this collection is based on hash values, and inserting elements is very fast and does not require <T>rearrangement of the collection like the List class.
We prepare 3 collections, and the objects in list1 are not processed. The objects in list2 override some methods, and list3 contains string types

The code is as follows:

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1. If the hash code value is not the same, it means that it is a new element, store;

2，If the hash code value is the same and the equles are judged to be equal, it means that the element already exists and does not exist；

3. If the hash code value is the same and the equles judgment is not equal, it means that the element does not exist and exists;

We use the Test2 object, which overrides the object's equals and hashCode methods. Here, let the Test2 object be considered the same instance as long as the id and a are the same, and of course it can be something else, it depends on the specific requirements

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www · Posted on 9/8/2017 3:01:50 PM

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