Question

我想从列表（id）中得出结论时从实体列表中删除项目。我已经编写了这段代码，但我猜测有更好的方法可以做到这一点，并提高性能。

这是我的代码：

List<int> toRemove; //includes the ids of the entities to be removed
        if (people.Count > 1)
            people.RemoveAll(x => people.Any(y => y != x && toRemove.Contains(x.ID)));
        else
            people.RemoveAll(x => toRemove.Contains(x.ID));

Answer 1

给出一个人员列表，例如：

var people = new List<Person>
{
    new Person { ID = 1, Name = "Fred1" },
    new Person { ID = 2, Name = "Fred2" },
    new Person { ID = 3, Name = "Fred3" },
    new Person { ID = 4, Name = "Fred4" },
    new Person { ID = 5, Name = "Fred5" },
    new Person { ID = 6, Name = "Fred6" },
    new Person { ID = 7, Name = "Fred7" },
    new Person { ID = 8, Name = "Fred8" },
    new Person { ID = 9, Name = "Fred9" },
    new Person { ID = 10, Name = "Fred10" }
};

要删除的ID列表：

List<int> toRemove = new List<int> { 3, 4, 5 };

您可以删除不需要的条目，如下所示：

people = people.Where(p => !toRemove.Contains(p.ID)).ToList();

哦，为了完整起见，这里有一个Person课来完成这个例子！

public class Person
{
    public int ID { get; set; }
    public string Name { get; set; }
}

并表明它有效：

https://ideone.com/ERP3rk

Linq to entities从列表中删除

1 个答案: