我怎么可以做一个区分大小写字符串比较？ [英] How can I do a case insensitive string comparison?

问题描述

我怎样才能让下面的情况下，不区分大小写行？

How can I make the line below case insensitive?

drUser["Enrolled"] = 
      (enrolledUsers.FindIndex(x => x.Username == (string)drUser["Username"]) != -1);

我得到了一些建议今天早些时候的建议我使用：

I was given some advice earlier today that suggested I use:

x.Username.Equals((string)drUser["Username"], StringComparison.OrdinalIgnoreCase)));

麻烦的是，我不能得到这个工作，我已经试过下面的线，这编译，但返回错误的结果，如报名返回登记用户的取消注册和取消注册用户。

the trouble is I can't get this to work, I've tried the line below, this compiles but returns the wrong results, it returns enrolled users as unenrolled and unenrolled users as enrolled.

drUser["Enrolled"] = 
      (enrolledUsers.FindIndex(x => x.Username.Equals((string)drUser["Username"], 
                                 StringComparison.OrdinalIgnoreCase)));

任何人都可以指出问题？

Can anyone point out the problem?

推荐答案

这是.NET Framework中不是最好的做法（4安培+）来检查的平等

This is not the best practice in .NET framework (4 & +) to check equality

String.Compare(x.Username, (string)drUser["Username"], 
                  StringComparison.OrdinalIgnoreCase) == 0

使用替代以下

String.Equals(x.Username, (string)drUser["Username"], 
                   StringComparison.OrdinalIgnoreCase) 

MSDN建议：

  
• 使用String.Equals方法的重载测试两个字符串是否相等。

  
• 使用的String.Compare 和 String.CompareTo 方法为字符串，排序的不检查平等

  

• Use an overload of the String.Equals method to test whether two strings are equal.
• Use the String.Compare and String.CompareTo methods to sort strings, not to check for equality.

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