Asp.net url分頁的使用者控件

來源：snooker_li的專欄

最近做一個相簿程式頻繁的需要分頁，所以就想寫一個使用者控制項出來。

程式碼如下：

AutoPage.ascx頁面

<%@ Control Language="c#" AutoEventWireup="false" Codebehind="AutoPage.ascx.cs" Inherits="album.AutoPage" TargetSchema=" http://schemas.microsoft.com/ intellisense/ie5 " %>
<table border="0" cellpadding="0" cellspacing="0">
<tr>
<td valign="middle" height="30">共<asp:label id="lb_ItemCount" ForeColor="Red" runat="server"></asp:label>筆記錄&nbsp;</td>
<td valign="middle" height="30"><asp:hyperlink id="hpl_First" runat="server">首頁</asp:hyperlink>&nbsp;</td>
<td valign="middle" height="30"><asp:hyperlink id="hpl_Prev" runat="server">上頁</asp:hyperlink>&nbsp;</td>
<td valign="middle" height="30">目前<asp:label id="lb_CurrentPage" runat="server"></asp:label>頁/共<asp:label id="lb_PageCount" runat=" server"></asp:label>頁&nbsp;</td>
<td valign="middle" height="30"><asp:hyperlink id="hpl_Next" runat="server">下頁</asp:hyperlink>&nbsp;</td>
<td valign="middle" height="30"><asp:hyperlink id="hpl_Last" runat="server">末頁</asp:hyperlink>&nbsp;</td>
<td valign="middle" height="30"><asp:textbox id="txb_Page" runat="server" Width="32px" BorderStyle="Solid" BorderWidth="1px"
BorderColor="Silver"></asp:textbox></td>
<td valign="middle" height="30"><asp:ImageButton id="btn_go" runat="server" ImageUrl="album_images/go.gif"></asp:ImageButton></td>
<td valign="middle" height="30"><asp:label id="lb_url" runat="server" Visible="False"></asp:label><asp:Label id="lb_Params" runat= "server" Visible="False"></asp:Label></td>
</tr>
</table>

AutoPage.ascx.cs頁面

namespace album
{
using System;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

/// <summary>
/// UC 的摘要說明。
/// </summary>
public class AutoPage : System.Web.UI.UserControl
{
protected System.Web.UI.WebControls.HyperLink hpl_First;
protected System.Web.UI.WebControls.HyperLink hpl_Prev;
protected System.Web.UI.WebControls.HyperLink hpl_Next;
protected System.Web.UI.WebControls.Label lb_CurrentPage;
protected System.Web.UI.WebControls.Label lb_PageCount;
protected System.Web.UI.WebControls.HyperLink hpl_Last;
public int pagesize;
public string PageP;
protected System.Web.UI.WebControls.TextBox txb_Page;
protected System.Web.UI.WebControls.Label lb_url;
protected System.Web.UI.WebControls.Label lb_ItemCount;
public string url;
protected System.Web.UI.WebControls.Label lb_Params;
protected System.Web.UI.WebControls.ImageButton btn_go;
public string Params;

private void Page_Load(object sender, System.EventArgs e)
{

}

public PagedDataSource databind(DataTable dt)
{
lb_url.Text = url;
lb_Params.Text = Params;
//建立分頁類
PagedDataSource objPage = new PagedDataSource();
//設定資料來源
objPage.DataSource = dt.DefaultView;
//允許分頁
objPage.AllowPaging = true;
//設定每頁顯示的項數
objPage.PageSize = pagesize;
//設定當前頁的索引
int CurPage=1;
try
{
CurPage = Convert.ToInt32(PageP);
if (CurPage<1 || CurPage>objPage.PageCount)
{
Response.Redirect(url+"?page=1"+Params);
}
}
catch
{
Response.Redirect(url+"?page=1"+Params);
}
objPage.CurrentPageIndex = CurPage-1;
//顯示狀態資訊
lb_ItemCount.Text = dt.Rows.Count.ToString();
lb_CurrentPage.Text = CurPage.ToString();
lb_PageCount.Text =objPage.PageCount.ToString();

//如果目前頁面不是首頁
if (!objPage.IsFirstPage)
{
hpl_Prev.NavigateUrl=url + "?Page=" + Convert.ToString(CurPage-1)+Params;
hpl_First.NavigateUrl=url + "?Page=1"+Params;
}
//如果目前頁面不是最後一頁
if (!objPage.IsLastPage)
{
hpl_Next.NavigateUrl=url+ "?Page=" + Convert.ToString(CurPage+1)+Params;
hpl_Last.NavigateUrl=url + "?Page=" +objPage.PageCount.ToString()+Params;
}
return objPage;
}

#region Web 窗體設計器產生的程式碼
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 此呼叫是ASP.NET Web 窗體設計器所必需的。
//
InitializeComponent();
base.OnInit(e);
}

/// <summary>
/// 設計器支援所需的方法- 不要使用程式碼編輯器
/// 修改此方法的內容。
/// </summary>
private void InitializeComponent()
{
this.btn_go.Click += new System.Web.UI.ImageClickEventHandler(this.btn_go_Click);
this.Load += new System.EventHandler(this.Page_Load);

}
#endregion

private void btn_go_Click(object sender, System.Web.UI.ImageClickEventArgs e)
{
Response.Redirect(lb_url.Text+"?Page="+txb_Page.Text+lb_Params.Text);
}

}
}

呼叫的時候需要設定幾個參數pagesize(每頁顯示資料個數),PageP(傳遞的分頁參數),ParmP(其他的Request.QureyString參數),url(頁面位址)

綁定的時候只需要把控件的DataSource=AutoPage1.databind(DataTable變數)