C# 使用 LINQ，从对象列表中创建一个新的对象列表，删除其属性在字符串列表中的对象

Question

I have an object like this -

public MyObject
{
    public int Id { get; set; } 
    public string MyType { get; set; }
}

a list of those objects -

public List<MyObject> MyObjectList { get; set; }

and a list of string like this -

public List<string> MyTypeList { get; set; }

Using LINQ on MyObjectList , I want to create a list of MyObject removing any MyObject that has a MyObject.MyType that is in the MyTypeList .

Something like this (here are some unsuccessful attempts) -

List<MyObject> MyObjectListNEW = MyObjectList.Select(i => i.MyType).Except(MyTypeList).ToList();
List<MyObject> MyObjectListNEW = MyObjectList.Where(i => i.MyType.Except(MyTypeList));

Answer 1

This should work:

var MyObjectList = new List<MyObject>();
var MyTypeList = new List<string>();
var results = MyObjectList.Where(m => !MyTypeList.Any(t => m.MyType == t)).ToList();

Answer 2

尝试这个

var results = MyObjectList.Where(m =>  !MyTypeList.Contains(m.MyType)).ToList();

Answer 3

我认为应该是

var results = MyObjectList.Where(m => ! MyTypeList.Contains(m.MyType)).ToList();