将 Unicode 字符串转换为转义的 ASCII 字符串 [英] Convert a Unicode string to an escaped ASCII string

问题描述

如何转换这个字符串:

This string contains the Unicode character Pi(π)

转为转义的 ASCII 字符串:

into an escaped ASCII string:

This string contains the Unicode character Pi(u03a0)

和反之?

C# 中可用的当前编码将 π 字符转换为?".我需要保留那个角色.

The current Encoding available in C# converts the π character to "?". I need to preserve that character.

推荐答案

这会在 uXXXX 格式之间来回切换.

This goes back and forth to and from the uXXXX format.

class Program {
    static void Main( string[] args ) {
        string unicodeString = "This function contains a unicode character pi (u03a0)";

        Console.WriteLine( unicodeString );

        string encoded = EncodeNonAsciiCharacters(unicodeString);
        Console.WriteLine( encoded );

        string decoded = DecodeEncodedNonAsciiCharacters( encoded );
        Console.WriteLine( decoded );
    }

    static string EncodeNonAsciiCharacters( string value ) {
        StringBuilder sb = new StringBuilder();
        foreach( char c in value ) {
            if( c > 127 ) {
                // This character is too big for ASCII
                string encodedValue = "\u" + ((int) c).ToString( "x4" );
                sb.Append( encodedValue );
            }
            else {
                sb.Append( c );
            }
        }
        return sb.ToString();
    }

    static string DecodeEncodedNonAsciiCharacters( string value ) {
        return Regex.Replace(
            value,
            @"\u(?<Value>[a-zA-Z0-9]{4})",
            m => {
                return ((char) int.Parse( m.Groups["Value"].Value, NumberStyles.HexNumber )).ToString();
            } );
    }
}

输出:

这个函数包含一个unicode字符pi(π)

This function contains a unicode character pi (π)

此函数包含一个 unicode 字符 pi (u03a0)

This function contains a unicode character pi (u03a0)

这个函数包含一个unicode字符pi(π)

This function contains a unicode character pi (π)

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