实体框架linq获取除相同值外的值

Question

I have 2 list type of string below,

First List :

List<string> firstList = new List<string>();

firstList values

10    
15    
33    
45

Second List:

List<string> secondList = new List<string>();

secondList values

10    
15    
90    
70

Result list must be

10
15
33
45
90
70

How can I get matching firstList and secondList after that get only once same values like result in above ?

How can I get same situation for type of List ?

Answer 1

allUniqueItems = first.Union(second).ToList();

Answer 2

使用Concat ，然后使用不同的值

List<string> thirdList = firstList.Concat(secondList).Distinct().ToList();