Set operator

Distinct

去重
Returns distinct values from a collection.

Except

取差集
Returns the difference between two sequences, which means the elements of one collection that do not appear in the second collection.

1. IList<string> strList1 =newList<string>(){"One","Two","Three","Four","Five"};
2. IList<string> strList2 =newList<string>(){"Four","Five","Six","Seven","Eight"};
4. var result = strList1.Except(strList2);
6. foreach(string str in result)
7. Console.WriteLine(str);
9. Results:
10. One
11. Two
12. Three

Intersect

取並集
Returns the intersection of two sequences, which means elements that appear in both the collections.

Union

取交集
Returns unique elements from two sequences, which means unique elements that appear in either of the two sequences.

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