过滤XML(十六进制值 0x1D)无效的字符代码,CSharp代码库,德仔网

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【CSharp】过滤XML(十六进制值 0x1D)无效的字符

作者:Dezai.CN / 发布于2013/1/4/ 473

return System.Text.RegularExpressions.Regex.Replace(HttpUtility.HtmlEncode(str),@"[\x00-\x08]|[\x0B-\x0C]|[\x0E-\x1F]", "");



/// <summary>
/// 把一个字符串中的 低序位 ASCII 字符 替换成   字符
/// 转换  ASCII  0 - 8  -> ? - 
/// 转换  ASCII 11 - 12 ->  - 
/// 转换  ASCII 14 - 31 ->  - 
/// </summary>
/// <param name="tmp"></param>
/// <returns></returns>
public static string ReplaceLowOrderASCIICharacters(string tmp)
{
    StringBuilder info = new StringBuilder();
    foreach (char cc in tmp)
    {
        int ss = (int)cc;
        if (((ss >= 0) && (ss <= 8)) || ((ss >= 11) && (ss <= 12)) || ((ss >= 14) && (ss <= 32)))
            info.AppendFormat("{0:X};", ss);
        else info.Append(cc);
    }
    return info.ToString();
}
/// <summary>
/// 把一个字符串中的下列字符替换成 低序位 ASCII 字符
/// 转换  ? -   -> ASCII  0 - 8
/// 转换   -   -> ASCII 11 - 12
/// 转换   -  -> ASCII 14 - 31
/// </summary>
/// <param name="input"></param>
/// <returns></returns>
public static string GetLowOrderASCIICharacters(string input)
{
    if (string.IsNullOrEmpty(input)) return string.Empty;
    int pos, startIndex = 0, len = input.Length;
    if (len <= 4) return input;
    StringBuilder result = new StringBuilder();
    while ((pos = input.IndexOf("", startIndex)) >= 0)
    {
        bool needReplace = false;
        string rOldV = string.Empty, rNewV = string.Empty;
        int le = (len - pos < 6) ? len - pos : 6;
        int p = input.IndexOf(";", pos, le);
        if (p >= 0)
        {
            rOldV = input.Substring(pos, p - pos + 1);
            // 计算 对应的低位字符
            short ss;
            if (short.TryParse(rOldV.Substring(3, p - pos - 3), System.Globalization.NumberStyles.AllowHexSpecifier, null, out ss))
            {
                if (((ss >= 0) && (ss <= 8)) || ((ss >= 11) && (ss <= 12)) || ((ss >= 14) && (ss <= 32)))
                {
                    needReplace = true;
                    rNewV = Convert.ToChar(ss).ToString();
                }
            }
            pos = p + 1;
        }
        else pos += le;
        string part = input.Substring(startIndex, pos - startIndex);
        if (needReplace) result.Append(part.Replace(rOldV, rNewV));
        else result.Append(part);
        startIndex = pos;
    }
    result.Append(input.Substring(startIndex));
    return result.ToString();
}

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