从另一个List <>中删除List <>中包含的对象？

Question

I have an object which is contained within a List<>, I need to remove these from another List<>

eg

List<MyObject> AllElements = new List<MyObject>();
List<MyObject> SearchResults = new List<MyObject>();

... Do something so that SearchResults contains a subset of the objects contained within AllResults

Currently I do this to delete them from the main list:

for(int i = 0; i < SearchResults.Count; i++) 
    AllElements.Remove(SearchResults[i]); 

Is there an nicer [linqier!] way?

Answer 1

You can use the Enumerable.Except Method (from MSDN)

List <MyObject> FilteredElements = AllElements.Except(SearchResults).ToList();

Answer 2

IEnumerable<T>.Except你的朋友（如果我正确地阅读你的例子）：

allElements = allElements.Except(searchResults);

Answer 3

The following will give you a 'list' where everything in SearchResults was removed.

var results = AllElements.Where(i => !SearchResults.Contains(i));

You could then do:

AllElements = results.AsList();