public static class StringExtension  
{      
    #region unicode 字符转义  
    /// <summary>  
    /// 转换输入字符串中的任何转义字符。如：Unicode 的中文 \u8be5  
    /// </summary>  
    /// <param name="str"></param>  
    /// <returns></returns>  
    public static string UnicodeDencode(this string str)  
    {  
        if (string.IsNullOrWhiteSpace(str))  
            return str;  
        return Regex.Unescape(str);  
    }  
    /// <summary>  
    /// 将字符串进行 unicode 编码  
    /// </summary>  
    /// <param name="str"></param>  
    /// <returns></returns>  
    public static string UnicodeEncode(this string str)  
    {  
        if (string.IsNullOrWhiteSpace(str))  
            return str;  
        StringBuilder strResult = new StringBuilder();  
        if (!string.IsNullOrEmpty(str))  
        {  
            for (int i = 0; i < str.Length; i++)  
            {  
                strResult.Append("\\u");  
                strResult.Append(((int)str[i]).ToString("x4"));  
            }  
        }  
        return strResult.ToString();  
    }  
    #endregion  
}