DataGrid自定义分页（C#）

DataGrid自定义分页（C#）

当需要查查看每一页时，只从数据源提取要显示于该页面的数据记录
设置与原则：
1、AllowPaging设置成True，另外，AllowCustonPaging也设置为True，允许自定义分页
2、把数据源的数据记录数赋值给DataGrid的VirtuallItemCount属性
3、DataGrid控件绑定至数据源

C＃：
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Data.OleDb;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
namespace eMeng.Exam.DataGridPaging
{
/// <summary>
/// DataGridPaging 的摘要说明。
/// </summary>
public class DataGridPaging : System.Web.UI.Page
{
protected System.Web.UI.WebControls.DataGrid DataGrid1;
protected System.Web.UI.WebControls.Button Btnprev;
protected System.Web.UI.WebControls.Button BtnNext;
private int StartIndex;
private SqlConnection MyConn = null;
private void Page_Load(object sender, System.EventArgs e)
{
　 /// 在此处放置用户代码以初始化页面
this.Btnprev.Click+=new System.EventHandler(this.GotoPage);
this.BtnNext.Click+=new System.EventHandler(this.GotoPage);
if (!IsPostBack)
{
StartIndex = 0;
MyConn = new SqlConnection("server = localhost; uid = sa; pwd = ; database = northwind");
SqlCommand MyComm = new SqlCommand("select RecordTotal = count(*) from orders",MyConn);
MyConn.Open();
SqlDataReader dr = MyComm.ExecuteReader(CommandBehavior.SingleRow);
if (dr.Read())
{
DataGrid1.VirtualItemCount = (int)dr["RecordTotal"];
}
dr.Close();
MyConn.Close();
BindGridToSource(StartIndex,"上一页");
}
}
private void GotoPage(object sender, System.EventArgs e)
{
string PageInfo = ((Button)sender).CommandName;
switch(PageInfo)
{
case "上一页":
if(DataGrid1.CurrentPageIndex>0)
DataGrid1.CurrentPageIndex-=1;
break;
case "下一页":
if (DataGrid1.CurrentPageIndex<(DataGrid1.PageCount-1))
DataGrid1.CurrentPageIndex+=1;
else
return;
break;
}
StartIndex = DataGrid1.CurrentPageIndex*DataGrid1.PageSize;
BindGridToSource(StartIndex,PageInfo);
}
private void BindGridToSource(int StartPosition, string GoPage)
{
MyConn = new SqlConnection("server = localhost; uid = sa; pwd = ; database = northwind");
SqlCommand MyComm = null;
switch(GoPage)
{
case "上一页":
MyComm = new SqlCommand("select top 5 orderid,customerid,employeeid,orderdate,requireddate from orders "+
"where orderid >= @uid order by orderid",MyConn);
if (StartPosition == 0)
MyComm.Parameters.Add("@uid",SqlDbType.NVarChar,5).Value = "";
else
MyComm.Parameters.Add("@uid",SqlDbType.NVarChar,5).Value =
ViewState[(DataGrid1.CurrentPageIndex+1).ToString()];
break;
case "下一页":
MyComm = new SqlCommand("select top 5 orderid,customerid,employeeid,orderdate,requireddate from orders "+
"where orderid > @uid order by orderid",MyConn);
MyComm.Parameters.Add("@uid",SqlDbType.NVarChar,
18).Value = DataGrid1.Items[4].Cells[0].Text;
break;
}
MyConn.Open();
SqlDataReader dr = MyComm.ExecuteReader();
DataGrid1.DataSource = dr;
DataGrid1.DataBind();
dr.Close();
MyConn.Close();
ViewState[(DataGrid1.CurrentPageIndex + 1).ToString()] =
DataGrid1.Items[0].Cells[0].Text;
}

#region Web Form Designer generated code
override protected void OnInit(EventArgs e)
{
//
// CODEGEN：该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.Load += new System.EventHandler(this.Page_Load);
}
#endregion
}
}