不知道为什么,微软既然提供了DataGrid的分页功能,为什么功能那么弱,要么只有上一页、下一页,要么就1、2、3、4、5、6页,根本不符合我们中国软件的“国情”啊。在我的印象里,好像不但要有“首页”、“上页”、“下页”、“末页”,还要有Goto到指定页等等,才算完美啊。不知道大家是否有同感。 鉴于此,我写了个关于DataGrid的分页功能的一个自定义用户控件,只要DataGrid需要翻页,就把此自定义控件过进来,在简单的Copy一下代码,就OK了。以下是自定义控件的代码。和如何使用它的代码,供大家参考,不妥之处,望批之。
1、自定义用户控件名称为 ChangePage.ascx
1.1、界面段的代码如下
<%@ Control Language="c#" AutoEventWireup="false" Codebehind="ChangePage.ascx.cs" Inherits="Education.Web.ChangePage"
TargetSchema="http://schemas.microsoft.com/intellisense/ie5"%> <script language="javascript"> <!-- function val_num(field) { if (field.value=="") { alert("错误!\n\n请输入正确数字!"); field.focus(); field.select(); return false; } else if (field.value.indexOf(" ")>=0) { alert("错误!\n\n请输入正确数字!\n勿包含空格!"); field.focus(); field.select(); return false; } else if (isNaN(field.value)) { alert("错误!\n\n请输入正确数字!"); field.focus(); field.select(); return false; } else if (field.value.indexOf(''''.'''')>=0) { alert("错误!\n\n请输入整数!") field.focus(); field.select(); return false; } else if (parseInt(field.value)<=0) { alert("错误!\n\n请输入正确数字!"); field.focus(); field.select(); return false; } return true; } //--> </script> <TABLE id="Table11" cellSpacing="0" cellPadding="0" width="100%" border="0"> <tr> <td align="right"><asp:linkbutton id="btnFirst" runat="server" CssClass="Linkbutton" Text="首页" CommandArgument="0">首页
</asp:linkbutton><asp:linkbutton id="btnPrev" runat="server" CssClass="Linkbutton" Text="前页" CommandArgument="prev"> 前页</asp:linkbutton><asp:linkbutton id="btnNext" runat="server" CssClass="Linkbutton" Text="后页" CommandArgument="next"> 后页</asp:linkbutton><asp:linkbutton id="btnLast" runat="server" CssClass="Linkbutton" Text="末页" CommandArgument="last"> 末页</asp:linkbutton> <asp:label id="lblGoPage" runat="server">转到:</asp:label><asp:textbox id="txtGoPage" runat="server" Width="25px"
CssClass="text"></asp:textbox> <asp:label id="lblPage" runat="server">页</asp:label> <asp:button id="btnGo" runat="server" CssClass="buttonShort" Text="Go" CommandArgument="GoPage"></asp:button> <asp:label
id="lblCurrentIndex" runat="server"></asp:label></td> </tr> </TABLE> 界面段代码结束
1.2、ChangePage.ascx.cs CodeBehind代码如下 namespace Education.Web { using System; using System.Data; using System.Drawing; using System.Web; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls;
/// <summary> /// 自定义用户控件,用来显示Grid分页 /// </summary> public abstract class ChangePage : System.Web.UI.UserControl { protected System.Web.UI.WebControls.LinkButton btnFirst; protected System.Web.UI.WebControls.LinkButton btnPrev; protected System.Web.UI.WebControls.LinkButton btnNext; protected System.Web.UI.WebControls.LinkButton btnLast; protected System.Web.UI.WebControls.Label lblGoPage; protected System.Web.UI.WebControls.TextBox txtGoPage; protected System.Web.UI.WebControls.Label lblPage; protected System.Web.UI.WebControls.Button btnGo; protected System.Web.UI.WebControls.Label lblCurrentIndex; //声明翻页事件 public delegate void PageIndexChangedEventHandler(object sender, System.EventArgs e); public event PageIndexChangedEventHandler PageIndexChanged; //声明GoTo事件 public delegate void GoPageEventHandler(object sender, int PageIndex); public event GoPageEventHandler GoPage;
protected virtual void OnPageIndexChanged(object sender,System.EventArgs e) { if (PageIndexChanged != null) PageIndexChanged(sender, e); }
protected virtual void OnGoPage(object sender,int PageIndex) { if (GoPage != null) GoPage(sender, PageIndex); }
private void Page_Load(object sender, System.EventArgs e) { //判断txtGoPage输入的是否为数字 this.btnGo.Attributes.Add("onclick","return val_num("+this.txtGoPage.ClientID.ToString()+")"); } //设置翻页按钮的Enabled属性 public void PagerButtonEnable(System.Web.UI.WebControls.DataGrid dgPage) { btnFirst.Enabled = (dgPage.CurrentPageIndex == 0 ? false : true); btnPrev.Enabled = (dgPage.CurrentPageIndex == 0 ? false : true); btnNext.Enabled = (dgPage.CurrentPageIndex == (dgPage.PageCount - 1) ? false : true); btnLast.Enabled = (dgPage.CurrentPageIndex == (dgPage.PageCount - 1) ? false : true); } //显示页面信息 public void ShowStats(System.Web.UI.WebControls.DataGrid dgPage) { lblCurrentIndex.Text = "页码:[ " + ((int)dgPage.CurrentPageIndex+1) + " / "+ dgPage.PageCount + " ]" ; } //首页 private void btnFirst_Click(object sender, System.EventArgs e) { OnPageIndexChanged( sender , e ); } //上页 private void btnPrev_Click(object sender, System.EventArgs e) { OnPageIndexChanged( sender , e ); } //下页 private void btnNext_Click(object sender, System.EventArgs e) { OnPageIndexChanged( sender , e ); } //末页 private void btnLast_Click(object sender, System.EventArgs e) { OnPageIndexChanged( sender , e ); } //GoTo到某一页 private void btnGo_Click(object sender, System.EventArgs e) { OnGoPage( sender ,Convert.ToInt32(this.txtGoPage.Text) ); }
#region Web Form Designer generated code override protected void OnInit(EventArgs e) { // // CODEGEN: This call is required by the ASP.NET Web Form Designer. // InitializeComponent(); base.OnInit(e); } /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeComponent() { this.btnFirst.Click += new System.EventHandler(this.btnFirst_Click); this.btnPrev.Click += new System.EventHandler(this.btnPrev_Click); this.btnNext.Click += new System.EventHandler(this.btnNext_Click); this.btnLast.Click += new System.EventHandler(this.btnLast_Click); this.btnGo.Click += new System.EventHandler(this.btnGo_Click); this.Load += new System.EventHandler(this.Page_Load);
} #endregion } } ChangePage.ascx.cs CodeBehind代码结束
2、如何在其他的页面中使用翻页的用户自定义控件
2.1、页面中拖拽的用户自定义控件代码如下
<uc1:changepage id="tcChangePage" runat="server"></uc1:changepage>
2.2、CodeBehind代码如下
using System; using System.Collections; using System.ComponentModel; using System.Data; using System.Data.SqlClient; using System.Text; using System.Web; using System.Web.SessionState; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls;
namespace Education.Web { /// <summary> /// 维护页面 /// </summary> public class TeachingCenterList : System.Web.UI.Page { //声明翻页用户控件 注意:名称tcChangePage应该和拖拽过来后的界面中的ChangePage控件的ID相同
protected ChangePage tcChangePage;
protected System.Web.UI.WebControls.DataGrid MyDataGrid; //要翻页的DataGrid控件的名称
public void Page_Load(object sender, System.EventArgs e) { if(!Page.IsPostBack) {
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