asp.net异步获取datatable并显示的实现方法

本文讲述了asp.net异步获取datatable并显示的实现方法。分享给大家供大家参考，具体如下：

上面就是结果，前台代码如下：

<%@ Page Language="C#" AutoEventWireup="true"
CodeFile="MethodOne.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
  <title></title>
  <link href="swcss.css" rel="stylesheet" type="text/css" />
  <link href="TableZB.css" rel="stylesheet" type="text/css" />
  <script src="js-datagrid/scripts/PagerView.js" type="text/javascript"></script>
  <link href="js-datagrid/style.css" rel="stylesheet" type="text/css" />
  <script src="jquery-1.4.1.min.js" type="text/javascript"></script>
  <script type="text/javascript">
    var currentpage = 1;
    $(document).ready(function() {
      $.get("Handler.ashx?flag=data&index=" + currentpage,
        function(data) {
          $("#sjxs").append(data);
        });
      $.get("Handler.ashx?flag=count",
        function(count) {
          var pager = new PagerView('pager');
          pager.itemCount = count;
          pager.size = 5;
          pager.onclick = function(index) {
            currentpage = index;
            $.get("Handler.ashx?flag=data&index=" + index,
              function(data) {
                $("#sjxs tr").each(function(m) {
                  $("#add" + m).remove();
                });
                $("#sjxs").append(data);
              });
          };
          pager.render();
        }
    );
    });
  </script>
</head>
<body>
  <form id="form1" runat="server">
  <fieldset style="width: 98%; border: solid 1px #EDF7DC;" class="fileset_style">
  <legend class="leg_style">查询结果</legend>
  <%--<div style="overflow:scroll;width:100%;height:100%">--%>
  <table border="1" cellpadding="0" cellspacing="0" width="100%" align="center" id="sjxs" class="TableStyleZB">
  <tr class="trTitle">
  <td colspan="5">当前发票库存情况</td>
  <td colspan="4">购买后一年(含)以上未验旧使用情况</td>
  <td></td>
  </tr>
  <tr class="trTitle">
  <td>管理机关</td>
  <td>合计</td>
  <td>机打发票</td>
  <td>手工发票</td>
  <td>冠名发票</td>
  <td>其他</td>
  <td>正常户</td>
  <td>占库存户数的比率</td>
  <td>非正常户</td>
  <td>证件失效户</td>
  </tr>
  <tr class="trTitle">
  <td>0</td>
  <td>1</td>
  <td>2</td>
  <td>3</td>
  <td>4</td>
  <td>5</td>
  <td>6</td>
  <td>7=6/1</td>
  <td>8</td>
  <td>9</td>
  </tr>
  </table>
  <%--</div>--%>
  </fieldset>
   <div id="pager"></div>
   <div id="info"></div>
  </form>
</body>
</html>

处理页面程序如下：

<%@ WebHandler Language="C#" Class="Handler" %>
using System;
using System.Web;
using System.Data;
using System.Data.SqlClient;
using System.Text;
public class Handler : IHttpHandler {
  public void ProcessRequest (HttpContext context) {
    context.Response.ContentType = "text/plain";
    if (context.Request.QueryString["flag"].Equals("data"))
    {
      context.Response.Write(GetResult(5,Int32.Parse(context.Request.QueryString["index"])));
    }
    if (context.Request.QueryString["flag"].Equals("count"))
    {
      context.Response.Write(getCount());
    }
  }
  private string GetResult()
  {
    DataTable dt = new DataTable();
    using (SqlConnection conn = new SqlConnection(System.Configuration.ConfigurationManager.AppSettings["conn"]))
    {
      conn.Open();
      string sql = "SELECT * FROM TestBlog ";
      SqlDataAdapter sda = new SqlDataAdapter(sql, conn);
      sda.Fill(dt);
    }
    int rLen = dt.Rows.Count;
    int cLen = dt.Columns.Count;
    StringBuilder sb = new StringBuilder();
    for (int j = 0; j < rLen; j++)
    {
      sb.Append("<tr>");
      for (int i = 0; i < cLen; i++)
      {
        sb.Append("<td>");
        sb.Append(dt.Rows[j][i].ToString());
        sb.Append("</td>");
      }
      sb.Append("</tr>");
    }
    return sb.ToString();
  }
  private string GetResult(int pagecount,int currentpage)
  {
    DataTable dt = new DataTable();
    using (SqlConnection conn = new SqlConnection(System.Configuration.ConfigurationManager.AppSettings["conn"]))
    {
      conn.Open();
      string sql = "SELECT TOP "+pagecount+" * FROM TestBlog tb WHERE ydid NOT IN (SELECT TOP "+pagecount*(currentpage-1)+" ydid FROM TestBlog tb2) ";
      SqlDataAdapter sda = new SqlDataAdapter(sql,conn);
      sda.Fill(dt);
    }
    int rLen = dt.Rows.Count;
    int cLen = dt.Columns.Count;
    StringBuilder sb = new StringBuilder();
    for (int j = 0; j < rLen; j++)
    {
      sb.Append("<tr id=add"+j+">");
      for (int i = 0; i < cLen; i++)
      {
        sb.Append("<td>");
        sb.Append(dt.Rows[j][i].ToString());
        sb.Append("</td>");
      }
      sb.Append("</tr>");
    }
    return sb.ToString();
  }
  private string getCount()
  {
    DataTable dt = new DataTable();
    using (SqlConnection conn = new SqlConnection(System.Configuration.ConfigurationManager.AppSettings["conn"]))
    {
      conn.Open();
      string sql = "select count(*) from testblog";
      SqlDataAdapter sda = new SqlDataAdapter(sql, conn);
      sda.Fill(dt);
    }
    return dt.Rows[0][0].ToString();
  }
  public bool IsReusable {
    get {
      return false;
    }
  }
}

可惜的是，在ie7中显示不出来结果，但是在chrome、firefox和opera中倒是显示都正常，感兴趣的朋友可以对此加以完善。

希望本文所述对大家asp.net程序设计有所帮助。

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