C#常用数据检查类

using System;
using System.Text;
using System.Web;
using System.Web.UI.WebControls;
using System.Text.RegularExpressions;
namespace Legalsoft.Wizard.Basic // 设置项目属性可修改本项目的命名空间
{
    /// <summary>
    /// 页面数据校验类
    /// 修改自李天平先生的作品，一并感谢。
    /// </summary>
    public class PageValidate
    {
        private static Regex RegNumber = new Regex("^[0-9]+contentquot;);
        private static Regex RegNumberSign = new Regex("^[+-]?[0-9]+contentquot;);
        private static Regex RegDecimal = new Regex("^[0-9]+[.]?[0-9]+contentquot;);
        //等价于^[+-]?\d+[.]?\d+contentnbsp;
        private static Regex RegDecimalSign = new Regex("^[+-]?[0-9]+[.]?[0-9]+contentquot;);
        //w 英文字母或数字的字符串，和 [a- zA-Z0-9] 语法一样
        private static Regex RegEmail = new Regex("^[\\w-]+@[\\w-]+\\.(com|net|org|edu|mil|tv|biz|info)contentquot;);
        private static Regex RegCHZN = new Regex("[\u4e00-\u9fa5]");
        public PageValidate()
        {
        }
        #region 数字字符串检查
        /// <summary>
        /// 检查Request查询字符串的键值，是否是数字，最大长度限制
        /// </summary>
        /// <param name="req">Request</param>
        /// <param name="inputKey"& gt;Request的键值</param>
        /// <param name="maxLen"& gt;最大长度</param>
        /// <returns>返回Request查询字符串</returns>
        public static string IsDigit(HttpRequest req, string inputKey, int maxLen)
        {
            string retVal = string.Empty;
            if (inputKey != null && inputKey != string.Empty)
            {
                retVal = req.QueryString[inputKey];
                if (null == retVal)
                    retVal = req.Form[inputKey];
                if (null != retVal)
                {
                    retVal = SqlText(retVal, maxLen);
                    if (!IsNumber(retVal))
                        retVal = string.Empty;
                }
            }
            if (retVal == null)
                retVal = string.Empty;
            return retVal;
        }
        /// <summary>
        /// 是否数字字符串
        /// </summary>
        /// <param name="inputData"& gt;输入字符串</param>
        /// <returns></returns>
        public static bool IsNumber(string inputData)
        {
            Match m = RegNumber.Match(inputData);
            return m.Success;
        }
        /// <summary>
        /// 是否数字字符串可带正负号
        /// </summary>
        /// <param name="inputData"& gt;输入字符串</param>
        /// <returns></returns>
        public static bool IsNumberSign(string inputData)
        {
            Match m = RegNumberSign.Match(inputData);
            return m.Success;
        }
        /// <summary>
        /// 是否是浮点数
        /// </summary>
        /// <param name="inputData"& gt;输入字符串</param>
        /// <returns></returns>
        public static bool IsDecimal(string inputData)
        {
            Match m = RegDecimal.Match(inputData);
            return m.Success;
        }
        /// <summary>
        /// 是否是浮点数可带正负号
        /// </summary>
        /// <param name="inputData"& gt;输入字符串</param>
        /// <returns></returns>
        public static bool IsDecimalSign(string inputData)
        {
            Match m = RegDecimalSign.Match(inputData);
            return m.Success;
        }
        #endregion
        #region 中文检测
        /// <summary>
        /// 检测是否有中文字符
        /// </summary>
        /// <param name="inputData"></param>
        /// <returns></returns>
        public static bool IsHasCHZN(string inputData)
        {
            Match m = RegCHZN.Match(inputData);
            return m.Success;
        }
        #endregion
        #region 邮件地址
        /// <summary>
        /// 是否是浮点数可带正负号
        /// </summary>
        /// <param name="inputData"& gt;输入字符串</param>
        /// <returns></returns>
        public static bool IsEmail(string inputData)
        {
            Match m = RegEmail.Match(inputData);
            return m.Success;
        }
        #endregion
        #region 其他
        /// <summary>
        /// 检查字符串最大长度，返回指定长度的串
        /// </summary>
        /// <param name="sqlInput"& gt;输入字符串</param>
        /// <param name="maxLength">最大长度</param>
        /// <returns></returns>
        public static string SqlText(string sqlInput, int maxLength)
        {
            if (sqlInput != null && sqlInput != string.Empty)
            {
                sqlInput = sqlInput.Trim();
                if (sqlInput.Length > maxLength)//按最大长度截取字符串
                    sqlInput = sqlInput.Substring(0, maxLength);
            }
            return sqlInput;
        }
        /// <summary>
        /// 字符串编码
        /// </summary>
        /// <param name="inputData"></param>
        /// <returns></returns>
        public static string HtmlEncode(string inputData)
        {
            return HttpUtility.HtmlEncode(inputData);
        }
        /// <summary>
        /// 设置Label显示Encode的字符串
        /// </summary>
        /// <param name="lbl"></param>
        /// <param name="txtInput"></param>
        public static void SetLabel(Label lbl, string txtInput)
        {
            lbl.Text = HtmlEncode(txtInput);
        }
        public static void SetLabel(Label lbl, object inputObj)
        {
            SetLabel(lbl, inputObj.ToString());
        }
        #endregion
    }
}