一些有用的函数

// 计算两个日期的时间间隔的小时数，DateTime1，DateTime2不论先后。随便放得出的结果都是正数。
    public string DateDiff(DateTime DateTime1, DateTime DateTime2)
    {
        double dateDiff = 0;

        TimeSpan ts1 = new TimeSpan(DateTime1.Ticks);
        TimeSpan ts2 = new TimeSpan(DateTime2.Ticks);
        TimeSpan ts = ts1.Subtract(ts2).Duration();
        //dateDiff = ts.Days*24 + ts.Hours + ts.Minutes/60 + ts.Seconds/3600;
        dateDiff = ts.TotalHours;
        return dateDiff.ToString("f4");
    }
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//得到当前的ＩＩＳ用户
    public string GetWebUserName()
    {   
        string Login_User;
        Login_User = System.Web.HttpContext.Current.Request.ServerVariables["LOGON_USER"].ToLower();
        short Index = 0;
        Index = (short)Login_User.IndexOf("\\");
        if (Index > 0)
        {
            Login_User = Login_User.Substring(Index + 1);
        }
        else
        {
            Login_User = String.Empty;
        }
       
        return Login_User;
    }
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//替代Gridview分页功能
public string WritePage(GridView TempGrid,int MaxPageCount)
    {
        //显示分页的信息(因为自带的只能显示部分功能)
        //完全采用系统自带功能实现．
        //在GridView的标签后面添加控件<table align=center width=98% height=26 valign=middle bgcolor=#e0e0e0 ><tr><td id=PageBar runat=server align=center></td></tr></table>
        //再想办法得到未分页前的最大页数，然在Data_bound中添加这个函数 PageBar.InnerHtml = Base.Pub.Write(Gridview,MaxPage)
        string Ret = string.Empty;
        int RowCount = TempGrid.Rows.Count;
        int PageIndex = TempGrid.PageIndex +1;
        int PageCount = TempGrid.PageCount;
        Ret = "<span style='font-size:9pt;'>总记录数:" + MaxPageCount.ToString() + "    每页:" + TempGrid.PageSize.ToString() + "条     页数:" + PageIndex.ToString() + "/" + PageCount.ToString() + "    ";
        if(PageIndex>1)
        {
            Ret += "<a href=" + "javascript:__doPostBack('" + TempGrid.ID + "','Page$First')" + ">首页</a>  <a href=" + "javascript:__doPostBack('" + TempGrid.ID + "','Page$Prev')" + ">上页</a> ";
        }
        else
        {
            Ret += "首页  上页 ";
        }
        //------------------------------------------------------------------------------------
        //此部分为中间的显示页码数，规则是当前页的前后五页
        int StartPage,EndPage;
        if(PageIndex>5)
        {
            StartPage = PageIndex -5;
        }
        else
        {
            StartPage = 1;
        }
        if(PageIndex +5 >PageCount)
        {
            EndPage = PageCount;
        }
        else
        {
            EndPage = PageIndex + 5;
        }
        for(int i=StartPage;i<EndPage;i++)
        {
            if(PageIndex ==i)
            {
                Ret += "<b>" +i.ToString()+ "</b> ";
            }
            else
            {
                Ret += "<a href="+"javascript:__doPostBack('" + TempGrid.ID + "','Page$" + i + "')"+">" + i + "</a>" + " ";
            }
        }
        if(PageIndex<PageCount)
        {
            Ret += "  <a href=" + "javascript:__doPostBack('" + TempGrid.ID + "','Page$Next')" + ">下页</a>  <a href=" + "javascript:__doPostBack('" + TempGrid.ID + "','Page$Last')" + ">尾页</a>";
        }
        else
        {
            Ret += "  下页  尾页";
        }

        //--------------------------------------------------------------------------------------
        //以下是输入页码，进行换行的部分'
        Ret += "&nbsp;<input id='PageNum__Gpc' onkeydown='if(!KeyIsNumber(event.keyCode))  {  return false; }' type='text' size='2' style='border-style:Groove;font-size:8pt;height:18px;width:25px;' /><input id='GOTO' type='button' value='GO' style='font-size:9pt;height:18px;width:26px;' onclick='CheckPageNum()' />";
        //JAVASCRIPT部分，用来限制输入框的输入值，以及对输入值进行换页处理
        Ret += "<script language='javascript'>";
        Ret += " var MaxPage=" + PageCount.ToString() + ";";
        Ret += "function KeyIsNumber(KeyCode)";
        Ret += "{";
        Ret += "if(((KeyCode>47)&&(KeyCode<58))||(KeyCode==8)||(KeyCode==46)||((KeyCode>95)&&(KeyCode<105)))";
        Ret += "{ return true;  }";
        Ret += "else";
        Ret += "{ return false; }";
        Ret += "}";
        Ret += "function CheckPageNum()";
        Ret += "{ var obj = document.getElementById('PageNum__Gpc');";
        Ret += "if ((obj.value!='')&&(obj.value!=0)&&(obj.value<=MaxPage))";
        Ret += "{";
        Ret += "try{";
        Ret += "__doPostBack('" + TempGrid.ID + "','Page$'+obj.value);    }";
        Ret += "catch(err) {}";
        Ret += "}";
        Ret += "}" + "</script>";
        //-------------------------------------------------------------------
        return Ret + "</span>";
    }
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