过滤列表< string>使用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.

答

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();

过滤列表< string>使用linq

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