.NET[C#]使用LINQ从List<T>集合中删除指定集合元素？

.NET[C#]使用LINQ从List<T>集合中删除指定集合元素？

问题描述

实体类(Author)：

public class Author{
    public int id{get;set;}
   public string firstname{get;set;}
   public string lastname {get;set;}
}

比如有如下的LINQ查询语句：

var authors = from x in authorsList
              select x;

其中，需要从查询集合中删除 firstname=’Bob’ 的所有用户，应该如何实现呢？

方案一

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

或者

authorsList.RemoveAll(x => x.firstname == "Bob");

方案二

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();