如何使用Lambda语法从列表中删除

时间:2013-01-16 12:22:13

标签: c# list lambda

假设:

List<Name> names = new List<Name>(); //list full of names

public void RemoveName(string name) {
   List<Name> n = names.Where(x => x.UserName == name);;
   names.Remove(n);
}

执行删除的Lambda语法是什么?

如果函数确实删除了,我怎么能得到“成功”的指示?

2 个答案:

答案 0 :(得分:31)

names.RemoveAll(x => x.UserName == name);

请注意,所有 lambda语法都提供Predicate<T>; lambda语法与使用lambda做的内容完全无关。

或者单场比赛(见评论):

var found = names.Find(x => x.UserName == name);
if(found != null) names.Remove(found);

或:

var index = names.FindIndex(x => x.UserName == name);
if(index >= 0) names.RemoveAt(index);

答案 1 :(得分:2)

var n = names.SingleOrDefault(x => x.UserName == name)
if(n != null && n.UserName.length > 0)
{
 names.Remove(n);
}

OR

var n= names.Where(x => x.UserName == name).First();
names.Remove(n)