使用标准LINQ操作符无法做到这一点，因为LINQ提供的是查询，而不是更新支持。

但是您可以生成一个新的列表并替换旧的列表。

var authorsList = GetAuthorList();

authorsList = authorsList.Where(a => a.FirstName != "Bob").ToList();

或者您可以在第二次操作中删除authors中的所有项。

var authorsList = GetAuthorList();

var authors = authorsList.Where(a => a.FirstName == "Bob").ToList();

foreach (var author in authors)
{
    authorList.Remove(author);
}

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();

我认为你只需要将作者列表中的项目分配到一个新的列表中就可以了。

//assume oldAuthor is the old list
Author newAuthorList = (select x from oldAuthor where x.firstname!="Bob" select x).ToList();
oldAuthor = newAuthorList;
newAuthorList = null;

你可以用两种方法去除

var output = from x in authorsList
             where x.firstname != "Bob"
             select x;

or

var authors = from x in authorsList
              where x.firstname == "Bob"
              select x;

var output = from x in authorsList
             where !authors.Contains(x) 
             select x;

我也有同样的问题，如果你想根据你的where条件简单输出，那么第一个解决方案更好。

为了保持代码流畅(如果代码优化不是关键)，你需要对列表做一些进一步的操作:

authorsList = authorsList.Where(x => x.FirstName != "Bob").<do_some_further_Linq>;

or

authorsList = authorsList.Where(x => !setToRemove.Contains(x)).<do_some_further_Linq>;

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