一些C#实用的方法汇总

代码如下：

  /// <summary>
     /// 过滤字符串方法，用于将单引号等特殊符号转化成中文符号
     /// </summary>
     /// <param name="msg">要转化的字符串</param>
     public static string  FilterStr(string msg)
     {
         string result = "";

        // msg = msg.Replace(",", "，");
         //msg = msg.Replace("<", "<");
         //msg = msg.Replace(">", ">");
        // msg = msg.Replace("\n", "<br>");
         // msg = msg.Replace("\"", """);

         msg = msg.Trim();
         msg = msg.Replace("'", "''");

         result = msg;

         return result;
     }

     public static void message(string meg)
     {

     }

     public static string FilterStrHtml(string msg)
     {
         string result = "";

         msg = msg.Replace("\'", "'");
         //msg = msg.Replace(",", "，");
         msg = msg.Replace("\n", "<br>");
         result = msg;

         return result;
     }

     public static string FilterStrnocode(string msg)
     {
         string result = "";

         msg = msg.Replace("'", "\'");
         msg = msg.Replace("<br>", "\n");
         result = msg;

         return result;
     }

     //弹出消息框
     /// <summary>
     /// 消息提示框
     /// </summary>
     /// <param name="msg">消息内容</param>
     public static void ShowMsgBox(string msg)
     {
        System.Web.HttpContext.Current.Response.Write("<script>alert('"+msg+"')</script>");
     }

     /// <summary>
     /// 弹出消息框,调用弹出消息框,不影响样式buss.Showmessage(this.Page,"提交成功");
     /// </summary>
     /// <param name="Page">Page对像</param>
     /// <param name="msg">消息</param>
     public static void Showmessage(System.Web.UI.Page Page, string msg)
     {
         //ClientScript.RegisterStartupScript(GetType(), "JS1", "alert('" + msg + "')", true);
         // Page.ClientScript.RegisterStartupScript(Page.GetType(), "JS1", "alert('" + msg + "')", true);
         Page.ClientScript.RegisterStartupScript(Page.GetType(), "", " <script lanuage=javascript>alert('" + msg + "')</script>");
     }

     /// <summary>
     /// 截取字符串
     /// </summary>
     /// <param name="msg">原字符串</param>
     /// <param name="lenth">要截取的长度</param>
     /// <returns></returns>
     public static string ReturnStr(string msg, int lenth)
     {
         string result = msg;

         if (msg.Length > lenth)
         {
             result = result.Substring(, lenth);
         }
         // http://www.cnblogs.com/sosoft/
         return result;

     }
     /// <summary>
     ///
     /// </summary>
     /// <param name="sqlstr"></param>
     /// <returns></returns>

     /// <summary>
     /// 剪切指定长度的字符串，并去掉HTML标记
     /// </summary>
     /// <param name="strr">要剪切字符串的Object形式</param>
     /// <param name="len">长度（中文长度为2)</param>
     /// <returns></returns>
     public static string CutStringX(object strr, int len)
     {
         string str = strr.ToString();
         string strRet = "";
         char CH;
         int nLen = str.Length;
         int nCutLen = ;
         int nPos = ;
         int bLeft = ;
         int nChinese = ;
         while (nPos < nLen && nCutLen < len)
         {
             CH = str[nPos];
             nPos++;

             if (CH == '<')
             {
                 bLeft++;
                 continue;
             }
             if (CH == '>')
             {
                 bLeft--;
                 continue;
             }
             if (nCutLen ==  && CH.ToString() == " " && CH.ToString() == "\n")
             {
                 continue;
             }
             if (bLeft == )
             {
                 //是否为中文
                 if (IsChinese(CH))
                 {
                     nCutLen += ;
                     nChinese++;
                 }
                 else
                 {
                     nCutLen += ;
                 }
                 strRet += CH;
             }
         }
         strRet = strRet.Replace(" ", " ");
         if (nPos < nLen)
         {
             strRet += "";
            // strRet += "...";
         }
         return strRet;
     }

     //是否为中文
     public static bool IsChinese(char ch)
     {
         ASCIIEncoding en = new ASCIIEncoding();
         byte[] b = en.GetBytes(ch.ToString());
         return (b[] == );
     }

     //HTML标记转换
     public static string HTMLEncode(string str)
     {
         str = str.Replace("<", "<");
         str = str.Replace(">", ">");
         str = str.Replace("\n", "<br/>");

         return str;
     }

     /// <summary>
     /// 把日期时间转换为日期,去掉时间
     /// </summary>
     /// <param name="str">格式:YYYY-MM-DD HH:MM:SS</param>
     /// <returns>返回日期 YYYY-MM-DD</returns>
     public static string GetDate(string str)
     {
         string[] s = str.Split(' ');
         string[] ss = s[].Split('-');
         if (ss[].Length < )
             ss[] = "" + ss[];
         if (ss[].Length < )
             ss[] = "" + ss[];
         return ss[] + "-" + ss[] + "-" + ss[];
     }

  //随机函数产生字符
     public static string CreateRandomCode(int codeCount, string allChar)
     {
         //验证码中的出现的字符，避免了一些容易混淆的字符。
         if (string.IsNullOrEmpty(allChar)) allChar = "3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,J,K,M,N,P,Q,R,S,T,U,W,X,Y";
         string[] allCharArray = allChar.Split(',');
         string randomCode = "";
         int temp = -;
         bool breCreate = (codeCount <  && allCharArray.Length > );

         Random rand = new Random();
         for (int i = ; i < codeCount; i++)
         {
             if (temp != -)
             {
                 rand = new Random(i * temp * ((int)DateTime.Now.Ticks));
             }
             int t = rand.Next(allCharArray.Length);
             if (temp == t && breCreate)
             {
                 return CreateRandomCode(codeCount, allChar);
             }
             temp = t;
             randomCode += allCharArray[t];
         }
         return randomCode;
     }