C＃字符串比较：CurrentCultureIgnoreCase和InvariantCultureIgnoreCase之间的差异 [英] C# String comparisons: Difference between CurrentCultureIgnoreCase and InvariantCultureIgnoreCase

问题描述

在C＃中进行字符串比较时，执行

  string test =testvalue之间的区别是什么？ 
 test.Equals（TESTVALUE，StringComparison.CurrentCultureIgnoreCase）; 
  

和

  string test =testvalue; 
 test.Equals（TESTVALUE，StringComparison.InvariantCultureIgnoreCase）; 
  

...并且包含额外的参数很重要吗？

解决方案

Microsoft为何时使用 InvariantCulture 属性：

MSDN：CultureInfo.InvariantCulture属性

...应用程序应使用
不变文化仅用于需要与文化无关的
结果的进程
，例如格式化和
解析持久保存到
文件的数据。

安全注意事项 p>

如果基于字符串
比较或大小写更改的结果做出安全决定
，则您的
应用程序应使用序数
比较，忽略使用InvariantCulture的情况而不是
。 [...]

字符串操作 a
文化敏感的字符串操作
不受
CurrentCulture的值的影响，它应该使用接受CultureInfo参数的方法
。
[...]

持久化数据

属性是
用于存储数据，不会直接显示给用户
。
以与文化无关的
格式存储数据，保证了
不会改变的已知格式。当用户从
不同的文化访问数据时，
可以根据特定用户的
格式化。 [...]

When doing a string comparison in C#, what is the difference between doing a

string test = "testvalue";
test.Equals("TESTVALUE", StringComparison.CurrentCultureIgnoreCase);

and

string test = "testvalue";
test.Equals("TESTVALUE", StringComparison.InvariantCultureIgnoreCase);

... and is it important to include that extra parameter, anyway?

解决方案

Microsoft gives some decent guidance for when to use the InvariantCulture property:

MSDN: CultureInfo.InvariantCulture Property

... an application should use the invariant culture only for processes that require culture-independent results, such as formatting and parsing data that is persisted to a file. In other cases, it produces results that might be linguistically incorrect or culturally inappropriate.

Security Considerations

If a security decision will be made based on the result of a string comparison or case change, your application should use an ordinal comparison that ignores case instead of using InvariantCulture. [...]

String Operations

If your application needs to perform a culture-sensitive string operation that is not affected by the value of CurrentCulture, it should use a method that accepts a CultureInfo parameter. [...]

Persisting Data

The InvariantCulture property is useful for storing data that will not be displayed directly to users. Storing data in a culture-independent format guarantees a known format that does not change. When users from different cultures access the data, it can be formatted appropriately based on specific user. [...]

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