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列表中lambd 的写法可以简化代码
List<int> l = new List<int>() { 1, 2, 3 };
List<int> lL = new List<int>() { 1, 2};
try
{
Debug.Assert(lL?.Count != null, "container argument is null");
l=l.FindAll(i=>!lL.Contains(i));
}
catch(Exception e)
{
Console.WriteLine(e.Message);
}