c#一些常用的方法集合

是从一个asp.net mvc的项目里看到的。挺实用的。

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通过身份证号码获取出生日期和性别

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通过身份证号码获取出生日期和性别

 #region 由身份证获得出生日期
    public static string CardBrith(string CardNo)
    {
        return CardNo.Substring(, ) + "-" + CardNo.Substring(, ) + "-" + CardNo.Substring(, );
    }
    #endregion

    #region 由身份证获得性别
    public static string CardSex(string CardNo)
    {
        string sSex = "";
        int sex = Convert.ToInt16(CardNo.Substring(, ));
        if (sex %  == )//性别代码为偶数是女性奇数为男性
        {
            sSex = "女";
        }
        else
        {
            sSex = "男";
        }
        return sSex;
    }
    #endregion

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验证身份证号码：

 #region 验证身份证号码
    /// <summary>
    /// 验证身份证号码，正确返回true
    /// </summary>
    /// <param name="Id"></param>
    /// <returns></returns>
    public static bool CardNO(string Id)
    {

        long n = ;

        if (long.TryParse(Id.Remove(), out n) == false || n < Math.Pow(, ) || long.TryParse(Id.Replace('x', '').Replace('X', ''), out n) == false)
        {

            return false;//数字验证

        }

        string address = "11x22x35x44x53x12x23x36x45x54x13x31x37x46x61x14x32x41x50x62x15x33x42x51x63x21x34x43x52x64x65x71x81x82x91";

        if (address.IndexOf(Id.Remove()) == -)
        {

            return false;//省份验证

        }

        string birth = Id.Substring(, ).Insert(, "-").Insert(, "-");

        DateTime time = new DateTime();

        if (DateTime.TryParse(birth, out time) == false)
        {

            return false;//生日验证

        }

        string[] arrVarifyCode = ("1,0,x,9,8,7,6,5,4,3,2").Split(',');

        string[] Wi = ("7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2").Split(',');

        char[] Ai = Id.Remove().ToCharArray();

        int sum = ;

        for (int i = ; i < ; i++)
        {

            sum += int.Parse(Wi[i]) * int.Parse(Ai[i].ToString());

        }

        int y = -;

        Math.DivRem(sum, , out y);

        if (arrVarifyCode[y] != Id.Substring(, ).ToLower())
        {

            return false;//校验码验证

        }

        return true;//符合GB11643-1999标准

    }
    #endregion

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字符串解码

 #region 字符串解码
     /// <summary>
     /// 字符串解码
     /// </summary>
     /// <param name="str">原字符</param>
     /// <returns>解码后的字符</returns>
     public static string StrDecode(string str)
     {
         if (string.IsNullOrEmpty(str)) { return str; }
         return System.Web.HttpUtility.HtmlDecode(str); ;
     }
     #endregion

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字符串编码

 #region 字符串编码
     /// <summary>
     /// 目前只做字符串编码
     /// </summary>
     /// <param name="str">原字符</param>
     /// <returns>编码后的字符</returns>
     public static string StrEncode(string str)
     {
         if (string.IsNullOrEmpty(str)) { return str; }
         return System.Web.HttpUtility.HtmlEncode(str);
     }
     #endregion

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获得分页记录

     #region 获得分页记录
     /// <summary>
     /// 获得分页记录,返回DataTable类型
     /// </summary>
     /// <param name="tblName">表名</param>
     /// <param name="strGetFields">需返回的字段</param>
     /// <param name="strWhere">条件</param>
     /// <param name="OrderType">排序字段</param>
     /// <param name="PageIndex">当前页面</param>
     /// <param name="PageSize">页尺寸</param>
     /// <returns>返回DataTable类型</returns>
     public static DataTable GetPageData(string tblName, string strGetFields, string strWhere, string OrderType, int PageIndex, int PageSize)
     {
         SqlParameter[] para = {
                     new SqlParameter("@Table", SqlDbType.VarChar, ){Value=tblName},//表名
                     new SqlParameter("@Fields", SqlDbType.VarChar, ){Value=strGetFields},//返回的列
                     new SqlParameter("@Where", SqlDbType.VarChar, ){Value=strWhere},//where条件
                     new SqlParameter("@OrderBy",SqlDbType.VarChar, ){Value=OrderType},//排序
                     new SqlParameter("@CurrentPage",SqlDbType.Int,){Value=PageIndex},//页码
                     new SqlParameter("@PageSize", SqlDbType.Int,){Value=PageSize}//页尺寸
                               };
         DataTable dt = new DataTable();
         XBSQL.RunProc("Pages", out dt, para);
         return dt;
     }
     #endregion

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获得符合条件指定列的和

     #region 获得符合条件指定列的和
     /// <summary>
     /// 返回符合条件指定列的和
     /// </summary>
     /// <param name="Field">列</param>
     /// <param name="TableName">表名</param>
     /// <param name="WhereSql">条件</param>
     /// <returns></returns>
     public static double RsSum(string Field, string TableName, string WhereSql)
     {
         string Num = XBSQL.EScalar("select sum(" + Field + ") from " + TableName + " where " + WhereSql + "").ToString();
         Num = (string.IsNullOrEmpty(Num)) ? "" : Num;
         return Convert.ToDouble(Num);
     }

     #endregion

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获取记录总和

     #region 获得记录总数
     /// <summary>
     /// 获得满足条件的记录总数
     /// </summary>
     /// <param name="TableName">表名</param>
     /// <param name="WhereSql">条件</param>
     /// <returns></returns>
     public static int RsCount(string TableName, string WhereSql)
     {
         int i = ;
         int.TryParse(XBSQL.EScalar("select Count(*) from " + TableName + " where " + WhereSql + "").ToString(), out i);
         return i;
         //return Convert.ToInt32(XBSQL.EScalar("select Count(*) from " + TableName + " where " + WhereSql + ""));
     }
     #endregion

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根据参数读取数据库，获取多条记录单个字段

  #region 根据参数读取数据库，获取多条记录单个字段
     /// <summary>
     /// 获取多条记录单个字段
     /// </summary>
     /// <param name="field"></param>
     /// <param name="table"></param>
     /// <param name="where"></param>
     /// <returns></returns>
     public static string RDSQL(string field, string table, string where)
     {
         StringBuilder Str = new StringBuilder();
         try
         {
             string sql = "select " + field + " from " + table + " where " + where + "";
             SqlDataReader dr = XBSQL.EReader(sql);
             while (dr.Read())
             {
                 Str.Append("," + dr[].ToString().Trim());
             }
             dr.Close();
             if (Str.Length > )
             {
                 Str.Remove(, );
                 return Str.ToString();
             }
             else
             {
                 return "";
             }
         }
         catch (Exception Error)
         {

         }
         finally
         {
             Str.Length = ;
         }
         return "";
     }
     #endregion

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字符串截取

    #region 字符串截取
    /// <summary>
    /// str为要进行截取的字符串,start是第一个关键字(字符串),last是第二个关键字(字符串),n截取字符串方式
    /// </summary>
    /// <param name="str"></param>
    /// <param name="start"></param>
    /// <param name="last"></param>
    /// <param name="n"></param>
    /// <returns></returns>
    public static string GetContent(string str, string start, string last, int n)
    {
        string ResStr = "";
        if (str.ToLower().IndexOf(start.ToLower()) >= )
        {
            if (str.ToLower().IndexOf(last.ToLower()) >= )
            {
                switch (n)
                {
                    //左右都截取（都取前面）（包含关键字）
                    case : ResStr = str.Substring(str.ToLower().IndexOf(start.ToLower()), str.Length - str.ToLower().IndexOf(start.ToLower()));
                        ResStr = ResStr.Substring(, ResStr.ToLower().IndexOf(last.ToLower()) + last.Length); break;
                    //左右都截取（都取前面）（去除关键字）
                    case : ResStr = str.Substring(str.ToLower().IndexOf(start.ToLower()) + start.Length, str.Length - str.ToLower().IndexOf(start.ToLower()) - start.Length);
                        ResStr = ResStr.Substring(, ResStr.ToLower().IndexOf(last.ToLower())); break;
                    default: ResStr = ""; break;
                }
            }
        }
        return ResStr;
    }
    public static string GetContent(string str, string start, int n)
    {
        string ResStr = "";
        switch (n)
        {
            //只往左截取（取前面的）（包含关键字）
            case : ResStr = str.Substring(, str.ToLower().IndexOf(start.ToLower()) + start.Length); break;
            //只往左截取（取前面的）（去除关键字）
            case :
                int StrIndex = str.ToLower().IndexOf(start.ToLower());
                if (StrIndex > )
                {
                    ResStr = str.Substring(, StrIndex);
                }
                break;
            //只往右截取（取前面的）（包含关键字）
            case : ResStr = str.Substring(str.ToLower().IndexOf(start.ToLower()), str.Length - str.ToLower().IndexOf(start.ToLower())); break;
            //只往右截取（取前面的）（去除关键字）
            case : ResStr = str.Substring(str.ToLower().IndexOf(start.ToLower()) + start.Length, str.Length - str.ToLower().IndexOf(start.ToLower()) - start.Length); break;
            default: ResStr = ""; break;
        }
        return ResStr;
    }
    #endregion

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判断ip格式

  #region 判断是否是IP格式
     /// <summary>
     /// 判断是否是IP地址格式 0.0.0.0
     /// </summary>
     /// <param name="str1">待判断的IP地址</param>
     /// <returns>true or false</returns>
     public static bool IsIPAddress(string str1)
     {
         if (str1 == null || str1 == string.Empty || str1.Length <  || str1.Length > ) return false;
         string regformat = @"^\d{1,3}[\.]\d{1,3}[\.]\d{1,3}[\.]\d{1,3}$";
         Regex regex = new Regex(regformat, RegexOptions.IgnoreCase);
         return regex.IsMatch(str1);
     }
     #endregion

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获取ip

 #region 获得IP
    /// <summary>
    /// 取得客户端真实IP。如果有代理则取第一个非内网地址
    /// </summary>
    public static string IPAddress
    {
        get
        {
            string result = String.Empty;
            result = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
            if (result != null && result != String.Empty)
            {
                //可能有代理
                if (result.IndexOf(".") == -)    //没有"."肯定是非IPv4格式
                    result = null;
                else
                {
                    if (result.IndexOf(",") != -)
                    {
                        //有","，估计多个代理。取第一个不是内网的IP。
                        result = result.Replace(" ", "").Replace("\"", "");
                        string[] temparyip = result.Split(",;".ToCharArray());
                        for (int i = ; i < temparyip.Length; i++)
                        {
                            if (IsIPAddress(temparyip[i])
                                && temparyip[i].Substring(, ) != "10."
                                && temparyip[i].Substring(, ) != "192.168"
                                && temparyip[i].Substring(, ) != "172.16.")
                            {
                                return temparyip[i];    //找到不是内网的地址
                            }
                        }
                    }
                    else if (IsIPAddress(result)) //代理即是IP格式
                        return result;
                    else
                        result = null;    //代理中的内容 非IP，取IP
                }
            }
            string IpAddress = (HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != null && HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != String.Empty) ? HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] : HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
            if (null == result || result == String.Empty)
                result = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
            if (result == null || result == String.Empty)
                result = HttpContext.Current.Request.UserHostAddress;
            return result;
        }
    }
    #endregion

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转换成日期格式

 #region 转换成日期格式
     /// <summary>
     /// 转换成日期格式,非日期返回空值
     /// </summary>
     /// <param name="Str">值</param>
     /// <returns></returns>
     public static string ToDate(string Str, string Format)
     {
         DateTime LDate;
         DateTime dt1 = DateTime.Parse("1900-01-01");
         DateTime dt2 = DateTime.Parse("9999-12-31");
         if (DateTime.TryParse(Str, out LDate) && DateTime.Compare(LDate, dt1) >  && DateTime.Compare(LDate, dt2) < )
         {
             Str = LDate.ToString("" + Format + "");
         }
         else
         {
             Str = "";
         }
         return Str.Trim();
     }
     #endregion