如何检测 SUB 字符并将其从 C# 中的文本文件中删除？
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How to detect SUB character and remove it from a text file in C#?
提问by user981848
I am writing a program to process special text files. Some of these text files end with a SUB character (a substitute character. It may be 0x1A.) How do I detect this character and remove it from the text file using C#?
我正在编写一个程序来处理特殊的文本文件。其中一些文本文件以 SUB 字符（替代字符。它可能是 0x1A）结尾。如何使用 C# 检测此字符并将其从文本文件中删除？
采纳答案by Jon Skeet
If it's really 0x1A in the binary data, and if you're reading it as an ASCII or UTF-8 file, it should end up as U+001A when read in .NET. So you maybe able to write something like:
如果它在二进制数据中确实是 0x1A，并且您将它作为 ASCII 或 UTF-8 文件读取，那么在 .NET 中读取时它应该以 U+001A 结尾。因此，您可能可以编写如下内容：
string text = File.ReadAllText("file.txt");
text = text.Replace("\u001a", "");
File.WriteAllText("file.txt", text);
Note that the "\u001a"part is a string consisting of a single character: \uxxxxis an escape sequence for a single UTF-16 code point with the given Unicode value expressed in hex.
请注意，该"\u001a"部分是由单个字符组成的字符串：\uxxxx是单个 UTF-16 代码点的转义序列，具有以十六进制表示的给定 Unicode 值。
回答by KeithS
The easiest answer would probably be a Regex:
最简单的答案可能是正则表达式：
public static string RemoveAll(this string input, char toRemove)
{
//produces a pattern like "\x1a+" which will match any occurrence
//of one or more of the character with that hex value
var pattern = @"\x" + ((int)toRemove).ToString("x") + "+";
return Regex.Replace(input, pattern, String.Empty);
}
//usage
var cleanString = dirtyString.RemoveAll((char)0x1a);
Yes, you could just pass in the int, but that requires knowing the integer value of the character. using a char as a parameter allows you to specify a literal or char variable with less muck.
是的，您可以只传入 int，但这需要知道字符的整数值。使用 char 作为参数允许您指定一个字面量或 char 变量较少的垃圾。
回答by MethodMan
You could also try something like this it should work
你也可以尝试这样的东西它应该可以工作
using (FileStream f = File.OpenRead("path\file")) //Your filename + extension
{
using (StreamReader sr = new StreamReader(f))
{
string text = sr.ReadToEnd();
text = text.Replace("\u001a", string.Empty);
}
}
回答by donners45
C# has a method to detect control characters (including SUB). See msdn : https://msdn.microsoft.com/en-us/library/9s05w2k9(v=vs.110).aspx
C# 有一种检测控制字符（包括 SUB）的方法。请参阅 msdn：https://msdn.microsoft.com/en-us/library/9s05w2k9( v=vs.110).aspx
