asp.net异步获取datatable并显示的实现方法

前端技术 2023/09/07 .NET

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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