过滤列表< string>使用linq

本文介绍了过滤列表< string>使用linq的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我想根据下面给出的条件筛选字符串列表，

Hi, I want to filter string list based on some condition as given below,

List<string> config = new List<string>(); config.Add("userdata.member1"); config.Add("userdata.member2"); config.Add("userdata.member3"); config.Add("userdata.member4"); config.Add("userdata.member5"); config.Add("attribute.memberattribute1"); config.Add("attribute.memberattribute2"); config.Add("attribute.memberattribute3"); config.Add("attribute.memberattribute4"); config.Add("attribute.memberattribute5"); string[] userDataKeys = config.Select(x => x.Contains("userdata.")?x.Replace("userdata.",""):x).ToArray();

我的尝试： 我想检查字符串是否有userdata。并用空字符串替换它最后只返回被替换的项目。 预期输出： member1 member2 会员3 会员4 会员5 谁能告诉我如何实现它使用linq。 谢谢。

What I have tried: I want to check whether the string has "userdata." and replace it with empty string finally return the replaced items only. Expected output: member1 member2 member3 member4 member5 can anyone tell me how to achieve it using linq. Thanks.

推荐答案

你几乎就在那里。首先，您需要确定哪些记录包含 userdata。。 where子句有助于： You're almost there. First you need to identify which records contain userdata.. A where clause helps here: config.Where(x => x.StartsWith("userdata.")).Select(x => x.Replace("userdata.", string.Empty)).ToList();

试试 try string[] userDataKeys = config.Where(x => x.Contains("userdata.")).Select(x => x.Replace("userdata.", "") ).ToArray();

无需使用 .StartWith 或 .Contains 方法。简单的 .Replace 应该足够了:) There's no need to use .StartWith or .Contains method. Simple .Replace should be enough :) var result = config.Select(x=>x.Replace("userdata.", string.Empty)).ToList();

当然，如果您只想返回成员字的数据，您可以使用：

Of course, if you want to return only data with member word, you can use:

var result = config.Where(x=>x.Contains("member")).Select(x=>x.Replace("userdata.", string.Empty)).ToList();