自定义GridView分页模板
GridView較之DataGrid提供了更加強大、更加完善的功能,而且具備了豐富的可擴展功能,可以使用GridView提供的pagertemplate自定義分頁模板:
事實上,GridView默認的幾中分頁樣式,都是將相關按鈕的CommandName設為Page,而CommandArgument設為相關參數,可接受的參數包括,first,last,prev,next,<PageIndex>(具體數字),然后按事件回溯,觸發頂層的RowCommand,因此我們頁可以使用這些默認的可識別的參數自定義自己的分頁模板,asp.net會自動設置當前的NewPageIndex,而不需要任何的冗余代碼。
.aspx頁面:
<asp:gridview id="GridView1" runat="server" allowpaging="True" pagesize="10"
??????????? autogeneratecolumns="False" datasourceid="SqlDataSource1"
??????????? onpageindexchanging="GridView1_PageIndexChanging">
??????????? <columns>
??????????????? <asp:boundfield datafield="CompanyName" headertext="CompanyName" sortexpression="CompanyName" />
??????????????? <asp:boundfield datafield="ContactTitle" headertext="ContactTitle" sortexpression="ContactTitle" />
??????????????? <asp:boundfield datafield="Phone" headertext="Phone" sortexpression="Phone" />
??????????????? <asp:boundfield datafield="Fax" headertext="Fax" sortexpression="Fax" />
??????????????? <asp:boundfield datafield="ContactName" headertext="ContactName" sortexpression="ContactName" />
??????????? </columns>
?????????????????????? <pagertemplate>
??????????????????????? <table width="100%">
????????????????????????? <tr>
??????????????????????????? <td style="text-align:right">
??????????????????????????? 第<asp:Label id="lblPageIndex" runat="server" text='<%# ((GridView)Container.Parent.Parent).PageIndex + 1? %>' />頁
??????????????????????????????? 共/<asp:Label id="lblPageCount" runat="server" text='<%# ((GridView)Container.Parent.Parent).PageCount? %>' />頁
??????????????????????????????? <asp:linkbutton id="btnFirst" runat="server" causesvalidation="False" commandargument="First" commandname="Page" text="首頁" />
????????????????????????????? <asp:linkbutton id="btnPrev" runat="server" causesvalidation="False" commandargument="Prev" commandname="Page" text="上一頁" />
???????????????????????????? <asp:linkbutton id="btnNext" runat="server" causesvalidation="False" commandargument="Next" commandname="Page" text="下一頁" />?????????????????????????
???????????????????????????? <asp:linkbutton id="btnLast" runat="server" causesvalidation="False" commandargument="Last" commandname="Page" text="尾頁" />???????????????????????????????????????????
???????????????????????????? <asp:textbox id="txtNewPageIndex" runat="server" width="20px" text='<%# ((GridView)Container.Parent.Parent).PageIndex + 1? %>' />
???????????????????????????? <asp:linkbutton id="btnGo" runat="server" causesvalidation="False" commandargument="-1" commandname="Page" text="GO" /><!-- here set the CommandArgument of the Go Button to '-1' as the flag -->
???????????????????????????? </td>
????????????????????????? </tr>
??????????????????????? </table>
??????????????????? </pagertemplate>
??????? </asp:gridview>
???
???
??????? <asp:sqldatasource id="SqlDataSource1" runat="server" connectionstring="Data Source=.;Initial Catalog=Northwind;Integrated Security=True"
??????????? providername="System.Data.SqlClient" selectcommand="SELECT [CompanyName], [ContactTitle], [Phone], [Fax], [ContactName] FROM [Customers]">
??????? </asp:sqldatasource>
PageIndexChanging處理程序:
??? protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
??? {
??????? GridView theGrid = sender as GridView;? // refer to the GridView
??????? int newPageIndex = 0;
??????? if (-2 == e.NewPageIndex) { // when click the "GO" Button
??????????? TextBox txtNewPageIndex = null;
??????????? //GridViewRow pagerRow = theGrid.Controls[0].Controls[theGrid.Controls[0].Controls.Count - 1] as GridViewRow; // refer to PagerTemplate
GridViewRow pagerRow = theGrid.BottomPagerRow; //GridView較DataGrid提供了更多的API,獲取分頁塊可以使用BottomPagerRow 或者TopPagerRow,當然還增加了HeaderRow和FooterRow
//updated at 2006年6月21日3:15:33
??????????? if (null != pagerRow) {
??????????????? txtNewPageIndex = pagerRow.FindControl("txtNewPageIndex") as TextBox;?? // refer to the TextBox with the NewPageIndex value
??????????? }
??????????? if (null != txtNewPageIndex) {
??????????????? newPageIndex = int.Parse(txtNewPageIndex.Text) - 1; // get the NewPageIndex
??????????? }
??????? }
??????? else {? // when click the first, last, previous and next Button
??????????? newPageIndex = e.NewPageIndex;
??????? }
??????? // check to prevent form the NewPageIndex out of the range
??????? newPageIndex = newPageIndex < 0 ? 0 : newPageIndex;
??????? newPageIndex = newPageIndex >= theGrid.PageCount ? theGrid.PageCount - 1 : newPageIndex;
??????? // specify the NewPageIndex
??????? theGrid.PageIndex = newPageIndex;
??????? // rebind the control
??????? // in this case of retrieving the data using the xxxDataSoucr control,
??????? // just do nothing, because the asp.net engine binds the data automatically
??? }
注意到,上面的示例中,由于增加了一個跳轉按鈕GO,但是asp。net不支持相關的CommandArgument值,雖然可以將Go Button的Commandname設為Page,還需要手動的在PageIndexChanging增加部分處理邏輯。
總結
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