C# 表单验证

  public static class  Text_Verification
    {

        /// <summary>
        /// 字符串长度
        /// </summary>
        /// <param name="str">字符串</param>
        /// <returns>返回长度</returns>
        public static int Text_Count(string str)
        => str.Count();
        /// <summary>
        /// 删除字符串头部及尾部出现的空格
        /// </summary>
        /// <param name="str">字符串</param>
        /// <returns>返回结果</returns>
        public static string Text_Trim(string str)
        => str.Trim();
        /// <summary>
        /// 检测是否有Sql危险字符
        /// </summary>
        /// <param name="str">要判断字符串</param>
        /// <returns>判断结果</returns>
        public static bool IsSafeSqlString(string str)
        => ! Regex.IsMatch(str, @"[;|,|\/|\}|\{|%|@|\*|!|\'|，|。|.|~|=|,]");
      


        /// <summary>
        /// 判断字符串中是否包含中文
        /// </summary>
        /// <param name="str">需要判断的字符串</param>
        /// <returns>判断结果</returns>
        public static bool ISChinese(string str)
        => Regex.IsMatch(str, @"[\u4e00-\u9fa5]");
        /// <summary>
        /// 判断字符串中是字母
        /// </summary>
        /// <param name="str">需要判断的字符串</param>
        /// <returns>判断结果</returns>
        public static bool IString(string str)
       => Regex.Matches(str, "[a-zA-Z]").Count > 0;
        /// <summary>
        /// 判断字符串中是否包含中文，字母，数字，-
        /// </summary>
        /// <param name="str">需要判断的字符串</param>
        /// <returns>判断结果</returns>

        public static bool ISAll(string str)
       => Regex.IsMatch(str, "^[-\a-zA-Z0-9\u4e00-\u9fa5]$");

        /// <summary>
        /// 去 前后 ，号
        /// </summary>
        /// <param name="s"></param>
        /// <returns></returns>
        public static string Del_star_end(string s)
        {
            string re = "";
            re=s.Trim().TrimStart(',').TrimEnd(',');
            return re;
        }

        #region 验证文本框输入为数字
        /// <summary>
        /// 验证是不是数字（包含整数和小数）
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static bool GetNum(string str)
        {
            return Regex.IsMatch(str, @"^[-]?\d+[.]?\d*$");
        }
        #endregion


        #region 验证文本框输入为整数
        /// <summary>
        /// 验证文本框输入为整数
        /// </summary>
        /// <param name="strNum">输入字符</param>
        /// <returns>返回一个bool类型的值</returns>
        public static bool IsNum(string str)
        => Regex.IsMatch(str, "^[0-9]*$");

        #endregion
        #region 验证文本框输入为日期
        /// <summary>
        /// 判断日期
        /// </summary>
        /// <param name="Date"></param>
        /// <returns></returns>
        public static bool IsValidDate(string Date)
        {
            //验证YYYY-MM-DD格式,基本上把闰年和2月等的情况都考虑进去
            bool bValid = Regex.IsMatch(Date, @"^((((1[6-9]|[2-9]\d)\d{2})-(0?[13578]|1[02])-(0?[1-9]|[12]\d|3[01]))|(((1[6-9]|[2-9]\d)\d{2})-(0?[13456789]|1[012])-(0?[1-9]|[12]\d|30))|(((1[6-9]|[2-9]\d)\d{2})-0?2-(0?[1-9]|1\d|2[0-8]))|(((1[6-9]|[2-9]\d)(0[48]|[2468][048]|[13579][26])|((16|[2468][048]|[3579][26])00))-0?2-29-))$");
            return (bValid && Date.CompareTo("1753-01-01") >= 0);

            //将平年和闰年的日期验证表达式合并，我们得到最终的验证日期格式为YYYY-MM-DD的正则表达式为：
            //(([0-9]{3}[1-9]|[0-9]{2}[1-9][0-9]{1}|
            //[0-9]{1}[1-9][0-9]{2}|[1-9][0-9]{3})-(((0[13578]|1[02])-
            //(0[1-9]|[12][0-9]|3[01]))|((0[469]|11)-(0[1-9]|[12][0-9]|30))|
            //(02-(0[1-9]|[1][0-9]|2[0-8]))))|((([0-9]{2})(0[48]|[2468][048]|
            //[13579][26])|((0[48]|[2468][048]|[3579][26])00))-02-29)
        }
        #endregion

        #region 验证文本框输入为电子邮件
        //验证电子邮件
        public static bool IsValidEmail(string strIn)
        {
            return Regex.IsMatch(strIn, @"^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$");
        }
        #endregion

        #region  验证文本框输入为电话号码
        /// <summary>
        /// 验证文本框输入为电话号码
        /// </summary>
        /// <param name="strPhone">输入字符串</param>
        /// <returns>返回一个bool类型的值</returns>
        public static bool validatePhone(string strPhone)
        {
            return Regex.IsMatch(strPhone, @"\d{3,4}-\d{7,8}");
        }
        #endregion

        #region  验证文本框输入为传真号码
        /// <summary>
        /// 验证文本框输入为传真号码
        /// </summary>
        /// <param name="strFax">输入字符串</param>
        /// <returns>返回一个bool类型的值</returns>
        public static bool validateFax(string strFax)
        {
            return Regex.IsMatch(strFax, @"86-\d{2,3}-\d{7,8}");
        }
        #endregion

        #region  验证是否为ip
        //获取IP的字符串 HttpContext.Current.Request.UserHostAddress

        /// <summary>
        /// 是否为ip
        /// </summary>
        /// <param name="ip"></param>
        /// <returns></returns>
        public static bool IsIP(string ip)
        {
            return Regex.IsMatch(HttpContext.Current.Request.UserHostAddress, @"^（（2[0-4]\d|25[0-5]|[01]?\d\d?）\.）{3}（2[0-4]\d|25[0-5]|[01]?\d\d?）$");
        }
        public static bool IsIPSect(string ip)
        {
            return Regex.IsMatch(HttpContext.Current.Request.UserHostAddress, @"^（（2[0-4]\d|25[0-5]|[01]?\d\d?）\.）{2}（（2[0-4]\d|25[0-5]|[01]?\d\d?|\*）\.）（2[0-4]\d|25[0-5]|[01]?\d\d?|\*）$");

        }
        #endregion

        #region  验证字符串是否是yy-mm-dd字符串
        /// <summary>
        /// 判断字符串是否是yy-mm-dd字符串
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static bool IsDateString(string str)
        {
            return Regex.IsMatch(str, @"（\d{4}）-（\d{1,2}）-（\d{1,2}）");
        }
        #endregion

        //----------------------------------------
    }