using System;
using System.Text;
using System.Web;
using System.Web.UI.WebControls;
using System.Text.RegularExpressions;


	/// <summary>
	/// 页面数据校验类
	/// 李天平
	/// 2004.8
	/// </summary>
	public class PageValidate
	{
		private static Regex RegNumber = new Regex("^[0-9]+$");
		private static Regex RegNumberSign = new Regex("^[+-]?[0-9]+$");
		private static Regex RegDecimal = new Regex("^[0-9]+[.]?[0-9]+$");
		private static Regex RegDecimalSign = new Regex("^[+-]?[0-9]+[.]?[0-9]+$"); //等价于^[+-]?\d+[.]?\d+$
		private static Regex RegEmail = new Regex("^[\\w-]+@[\\w-]+\\.(com|net|org|edu|mil|tv|biz|info)$");//w 英文字母或数字的字符串，和 [a-zA-Z0-9] 语法一样 
		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">Request的键值</param>
		/// <param name="maxLen">最大长度</param>
		/// <returns>返回Request查询字符串</returns>
		public static string FetchInputDigit(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">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">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">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">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">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">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());
		}		
        /// <summary>
        /// 获取安全字符
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string GetSafeStr(string str)
        {
            str = str.Replace("'", "");
            str = str.Replace(";", "");
            str = str.Replace("--", "");
            return str;
        }
		#endregion


	}
