c# list compare

问题

Hi I need to find a way to compare many (c#) List objects to output what numbers occur in each one.

E.g.

List1{1, 2, 3, 4, 5}
List2{1, 3, 6, 8}
List3{1, 2, 3}

this would return {1, 3}

回答1:

Use the Linq extension method Intersect.

var result = List1.Intersect(List2).Intersect(List3);

回答2:

LINQ intersect is built for that.

来源：https://stackoverflow.com/questions/5106788/c-sharp-list-compare