使用LINQ获取两个列表之间的差异

Question

我有两个列表,我需要比较它们,只返回不同时列出的项目列表.

var listOfIds = new List<int> {1,2,4};

var persons = new ObservableCollection<Person>
{
    new Person {Id = 1, Name = "Person 1"},
    new Person {Id = 2, Name = "Person 2"},
    new Person {Id = 3, Name = "Person 3"},
    new Person {Id = 4, Name = "Person 4"}
};

在这个例子new Person {Id = 3, Name = "Person 3"}中将是结果.Linq解决方案将是首选.

Answer 1

不会为你工作

var listOfIds = new List<int> {1,2,4};

var query = from item in persons 
            where !listOfIds .Contains( item.id )
            select item;

您可以查看更多详细信息:SQL到LINQ(案例7 - 使用IN和NOT IN子句过滤数据)

Answer 2

你也可以使用lambda:

var query = persons.Where(item => !listOfIds.Contains(item.Id));

Answer 3

var list1 = new List<int> {1,2,3,4,5};
var list2 = new List<int> {2,3,4,5,6};

list1.Except(list2); //1 - items removed
list2.Except(list1); //6 - items added