过滤特殊字符

 /// <summary>
        /// 过滤特殊字符
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string FilterSpecial(this string str)
        {
            if (str == string.Empty) //如果字符串为空，直接返回。
            {
                return str;
            }
            else
            {
                str = str.Replace("'", string.Empty);
                str = str.Replace("<", string.Empty);
                str = str.Replace(">", string.Empty);
                //str = str.Replace("%", string.Empty);
                str = str.Replace("'delete", string.Empty);
                str = str.Replace("''", string.Empty);
                str = str.Replace(",", string.Empty);
                str = str.Replace(".", string.Empty);
                str = str.Replace(">=", string.Empty);
                str = str.Replace("=<", string.Empty);
                str = str.Replace("-", string.Empty);
                str = str.Replace("_", string.Empty);
                str = str.Replace(";", string.Empty);
                str = str.Replace("||", string.Empty);
                str = str.Replace("[", string.Empty);
                str = str.Replace("]", string.Empty);
                str = str.Replace("&", string.Empty);
                str = str.Replace("/", string.Empty);
                str = str.Replace("-", string.Empty);
                str = str.Replace("|", string.Empty);
                str = str.Replace("?", string.Empty);
                str = str.Replace(">?", string.Empty);
                str = str.Replace("?<", string.Empty);
                str = str.Replace(" ", string.Empty);
                return str;
            }
        }