将Unicode字符串转换为转义的ASCII字符串

Z时代
2024-01-10
分类：问答

如何转换此字符串：

This string contains the Unicode character Pi(π)

转换为转义的ASCII字符串：

This string contains the Unicode character Pi(\u03a0)

和 反之亦然 ？

C＃中当前可用的编码将π字符转换为“？”。我需要保留那个角色。

回答：

这往返于\ uXXXX格式。

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();
            } );
    }
}