C# 从字符串中删除所有非 ASCII 字符
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Remove all non-ASCII characters from string
提问by user135498
I have a C# routine that imports data from a CSV file, matches it against a database and then rewrites it to a file. The source file seems to have a few non-ASCII characters that are fouling up the processing routine.
我有一个 C# 例程，它从 CSV 文件导入数据，将其与数据库进行匹配，然后将其重写到文件中。源文件似乎有一些非 ASCII 字符，这些字符扰乱了处理程序。
I already have a static method that I run each input field through but it performs basic checks like removing commas and quotes. Does anybody know how I could add functionality that removes non-ASCII characters too?
我已经有一个静态方法可以运行每个输入字段，但它执行基本检查，例如删除逗号和引号。有人知道我如何添加删除非 ASCII 字符的功能吗？
采纳答案by EToreo
string sOut = Encoding.ASCII.GetString(Encoding.ASCII.GetBytes(s))
回答by Jonas Elfstr?m
It sounds kind of strange that it's accepted to drop the non-ASCII.
放弃非 ASCII 是可以接受的，这听起来有点奇怪。
Also I always recommend the excellent FileHelperslibrary for parsing CSV-files.
另外，我总是推荐优秀的FileHelpers库来解析 CSV 文件。
回答by Eric J.
If you wanted to test a specific character, you could use
如果你想测试一个特定的字符，你可以使用
if ((int)myChar <= 127)
Just getting the ASCII encoding of the string will not tell you that a specific character was non-ASCII to begin with (if you care about that). See MSDN.
仅获取字符串的 ASCII 编码不会告诉您特定字符开始时是非 ASCII 字符（如果您关心的话）。请参阅MSDN。
回答by Jaider
Here a simple solution:
这里有一个简单的解决方案：
public static bool IsASCII(this string value)
{
// ASCII encoding replaces non-ascii with question marks, so we use UTF8 to see if multi-byte sequences are there
return Encoding.UTF8.GetByteCount(value) == value.Length;
}
source: http://snipplr.com/view/35806/
回答by Ross Kelly
public string RunCharacterCheckASCII(string s)
{
string str = s;
bool is_find = false;
char ch;
int ich = 0;
try
{
char[] schar = str.ToCharArray();
for (int i = 0; i < schar.Length; i++)
{
ch = schar[i];
ich = (int)ch;
if (ich > 127) // not ascii or extended ascii
{
is_find = true;
schar[i] = '?';
}
}
if (is_find)
str = new string(schar);
}
catch (Exception ex)
{
}
return str;
}
回答by paparazzo
Do it all at once
一次性完成
public string ReturnCleanASCII(string s)
{
StringBuilder sb = new StringBuilder(s.Length);
foreach(char c in s)
{
if((int)c > 127) // you probably don't want 127 either
continue;
if((int)c < 32) // I bet you don't want control characters
continue;
if(c == ',')
continue;
if(c == '"')
continue;
sb.Append(c);
}
return sb.ToString();
}
回答by rookie1024
Here's an improvement upon the accepted answer:
这是对接受的答案的改进：
string fallbackStr = "";
Encoding enc = Encoding.GetEncoding(Encoding.ASCII.CodePage,
new EncoderReplacementFallback(fallbackStr),
new DecoderReplacementFallback(fallbackStr));
string cleanStr = enc.GetString(enc.GetBytes(inputStr));
This method will replace unknown characters with the value of fallbackStr, or if fallbackStris empty, leave them out entirely. (Note that enccan be defined outside the scope of a function.)
此方法将用 的值替换未知字符fallbackStr，如果fallbackStr为空，则将它们完全排除。（请注意，enc可以在函数范围之外定义。）
