过滤列表< string>使用linq [英] Filter list<string> using linq

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();

这篇关于过滤列表< string>使用linq的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！