如果你真的需要删除项目，那么Except()怎么办? 你可以基于一个新的列表删除，或者通过嵌套Linq。

var authorsList = new List<Author>()
{
    new Author{ Firstname = "Bob", Lastname = "Smith" },
    new Author{ Firstname = "Fred", Lastname = "Jones" },
    new Author{ Firstname = "Brian", Lastname = "Brains" },
    new Author{ Firstname = "Billy", Lastname = "TheKid" }
};

var authors = authorsList.Where(a => a.Firstname == "Bob");
authorsList = authorsList.Except(authors).ToList();
authorsList = authorsList.Except(authorsList.Where(a=>a.Firstname=="Billy")).ToList();

下面是从列表中删除元素的示例。

 List<int> items = new List<int>() { 2, 2, 3, 4, 2, 7, 3,3,3};

 var result = items.Remove(2);//Remove the first ocurence of matched elements and returns boolean value
 var result1 = items.RemoveAll(lst => lst == 3);// Remove all the matched elements and returns count of removed element
 items.RemoveAt(3);//Removes the elements at the specified index

如果你真的需要删除项目，那么Except()怎么办? 你可以基于一个新的列表删除，或者通过嵌套Linq。

var authorsList = new List<Author>()
{
    new Author{ Firstname = "Bob", Lastname = "Smith" },
    new Author{ Firstname = "Fred", Lastname = "Jones" },
    new Author{ Firstname = "Brian", Lastname = "Brains" },
    new Author{ Firstname = "Billy", Lastname = "TheKid" }
};

var authors = authorsList.Where(a => a.Firstname == "Bob");
authorsList = authorsList.Except(authors).ToList();
authorsList = authorsList.Except(authorsList.Where(a=>a.Firstname=="Billy")).ToList();

我觉得你可以这样做

    authorsList = (from a in authorsList
                  where !authors.Contains(a)
                  select a).ToList();

尽管我认为已经给出的解决方案以更易于阅读的方式解决了问题。

LINQ起源于函数式编程，它强调对象的不可变性，因此它不提供内置的方式来就地更新原始列表。

关于不可变性的注意事项(来自另一个SO答案):

这是维基百科对不变性的定义。

在面向对象和函数式编程中，不可变对象是 创建后状态不可修改的对象。

简单的解决方案:

static void Main()
{
    List<string> myList = new List<string> { "Jason", "Bob", "Frank", "Bob" };
    myList.RemoveAll(x => x == "Bob");

    foreach (string s in myList)
    {
        //
    }
}