替换\\在C＃\ [英] Replace \\ with \ in C#

问题描述

我有一个很长的字符串（路径）用双反斜线，我想单反斜线来替代它：

 字符串=a\\b\\c\\d; 
字符串B = a.Replace（@\\，@\）; 
  

此代码做什么...

b 仍然a\\b\\c\\d

我也试过，而不是使用 @ 反斜杠的不同组合，但没有运气。

< DIV CLASS =h2_lin>解决方案

在C＃中，你不能有像a\b\c\d，因为 \ 有特殊的意义：它创建一个的转义序列与下面的字母（或数字组合）一起的。

\ b 表示实际上是一个退格键和 \c 和 \d 无效逃生序列（编译器会抱怨一个无法识别的转义序列）。

那么，你如何创建一个简单的 \ ？你必须使用一个反斜杠ESPACE反斜杠： \\ （它的协商序列表示单个反斜线）

这意味着字符串a\\b\\c\\d实际上代表 A \b\c\d （这并不代表 a\\b\\c\\d ，所以没有双反斜线）。你会看到自己，如果你尝试打印此字符串。

C＃也有一个叫做的逐字字符串（字符串与启动@ ），它允许你写 @a\b\c\d而不是a\\b\\c\\\的\\d。

I have a long string (a path) with double backslashes, and I want to replace it with single backslashes:

string a = "a\\b\\c\\d";
string b = a.Replace(@"\\", @"\");  

This code does nothing...

b remains "a\\b\\c\\d"

I also tried different combinations of backslashes instead of using @, but no luck.

解决方案

In C#, you can't have a string like "a\b\c\d", because the \ has a special meaning: it creates a escape sequence together with a following letter (or combination of digits).

\b represents actually a backspace, and \c and \d are invalid escape sequences (the compiler will complain about an "Unrecognized escape sequence").

So how do you create a string with a simple \? You have to use a backslash to espace the backslash:\\ (it's the espace sequence that represents a single backslash).

That means that the string "a\\b\\c\\d" actually represents a\b\c\d (it doesn't represent a\\b\\c\\d, so no double backslashes). You'll see it yourself if you try to print this string.

C# also has a feature called verbatim string literals (strings that start with @), which allows you to write @"a\b\c\d" instead of "a\\b\\c\\d".

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