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DataGridPageChangedEventHandler, délégué
Représente la méthode qui gère l'événement PageIndexChanged du contrôle DataGrid.
Assembly : System.Web (dans System.Web.dll)
public delegate void DataGridPageChangedEventHandler( Object source, DataGridPageChangedEventArgs e )
Paramètres
- source
- Type : System.Object
Source de l'événement.
- e
- Type : System.Web.UI.WebControls.DataGridPageChangedEventArgs
DataGridPageChangedEventArgs qui contient les données d'événement.
L'événement PageIndexChanged est déclenché suite à un clic sur un bouton dans l'élément de sélection de page du contrôle DataGrid.
Lorsque vous créez un délégué DataGridPageChangedEventHandler, vous identifiez la méthode qui gérera l'événement. Pour associer l'événement à votre gestionnaire d'événements, ajoutez une instance du délégué à l'événement. Le gestionnaire d'événements est appelé à chaque fois que l'événement se produit, sauf si vous supprimez le délégué. Pour plus d'informations sur les délégués de gestionnaires d'événements, consultez Événements et délégués.
L'exemple de code suivant illustre comment spécifier et coder un gestionnaire pour l'événement PageIndexChanged. Il affiche des pages sur le contrôle DataGrid par incrément de 10 éléments.
<%@ Page Language="C#" %> <%@ Import Namespace="System.Data" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server"> private ICollection CreateDataSource() { // Create sample data for the DataGrid control. DataTable dt = new DataTable(); DataRow dr; // Define the columns of the table. dt.Columns.Add(new DataColumn("IntegerValue", typeof(Int32))); dt.Columns.Add(new DataColumn("StringValue", typeof(String))); dt.Columns.Add(new DataColumn("CurrencyValue", typeof(Double))); // Populate the table with sample values.for (int i = 0; i <= 100; i++) { dr = dt.NewRow(); dr[0] = i; dr[1] = "Item " + i.ToString(); dr[2] = 1.23 * (i + 1); dt.Rows.Add(dr); } DataView dv = new DataView(dt); return dv; } privatevoid Page_Load(Object sender, EventArgs e) { // Load sample data only once, when the page is first loaded.if (!IsPostBack) { ItemsGrid.DataSource = CreateDataSource(); ItemsGrid.DataBind(); } } privatevoid Check_Change(Object sender, EventArgs e) { // Allow or prevent paging depending // on the user's selection. ItemsGrid.AllowPaging = AllowPagingCheckBox.Checked; // Rebind the data to refresh the DataGrid control. ItemsGrid.DataSource = CreateDataSource(); ItemsGrid.DataBind(); } privatevoid Grid_Change(Object sender, DataGridPageChangedEventArgs e) { // For the DataGrid control to navigate to the correct page when// paging is allowed, the CurrentPageIndex property must be updated// programmatically. This process is usually accomplished in the// event-handling method for the PageIndexChanged event.// Set CurrentPageIndex to the page the user clicked. ItemsGrid.CurrentPageIndex = e.NewPageIndex; // Rebind the data to refresh the DataGrid control. ItemsGrid.DataSource = CreateDataSource(); ItemsGrid.DataBind(); } </script> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server"> <title>DataGrid AllowPaging Example</title> </head> <body> <form id="form1" runat="server"> <div> <h3>DataGrid AllowPaging Example</h3> <p>Select whether to allow paging in the DataGrid control.<br /> <asp:CheckBox id="AllowPagingCheckBox" Text="Allow paging" AutoPostBack="True" Checked="True" OnCheckedChanged="Check_Change" runat="server" /> </p> <hr /> <asp:Label runat="server" AssociatedControlID="ItemsGrid" Font-Bold="true">Product List</asp:Label> <asp:DataGrid id="ItemsGrid" runat="server" BorderColor="Gray" BorderWidth="1" CellPadding="3" AutoGenerateColumns="False" UseAccessibleHeader="true" PageSize="10" AllowPaging="True" OnPageIndexChanged="Grid_Change"> <HeaderStyle BackColor="LightBlue" /> <Columns> <asp:BoundColumn DataField="IntegerValue" SortExpression="IntegerValue" ItemStyle-HorizontalAlign="center" HeaderText="Item" /> <asp:BoundColumn DataField="StringValue" HeaderText="Description" ItemStyle-HorizontalAlign="left" SortExpression="StringValue" /> <asp:BoundColumn DataField="CurrencyValue" HeaderText="Price" SortExpression="CurrencyValue" DataFormatString="{0:c}" /> </Columns> <ItemStyle HorizontalAlign="Right" /> </asp:DataGrid> </div> </form> </body> </html>
<%@ Page Language="C#" AutoEventWireup="True" %> <%@ Import Namespace="System.Data" %> <!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" > <script runat="server"> ICollection CreateDataSource() { // Create sample data for the DataGrid control. DataTable dt = new DataTable(); DataRow dr; // Define the columns of the table. dt.Columns.Add(new DataColumn("IntegerValue", typeof(Int32))); dt.Columns.Add(new DataColumn("StringValue", typeof(String))); dt.Columns.Add(new DataColumn("CurrencyValue", typeof(Double))); // Populate the table with sample values.for (int i=0; i<=100; i++) { dr = dt.NewRow(); dr[0] = i; dr[1] = "Item " + i.ToString(); dr[2] = 1.23 * (i + 1); dt.Rows.Add(dr); } DataView dv = new DataView(dt); return dv; } void Page_Load(Object sender, EventArgs e) { // Load sample data only once, when the page is first loaded.if (!IsPostBack) { ItemsGrid.DataSource = CreateDataSource(); ItemsGrid.DataBind(); } // Manually register the event-handling method for the PageIndexChanged // event of the DataGrid control. ItemsGrid.PageIndexChanged += new DataGridPageChangedEventHandler(this.Grid_Change); } void Check_Change(Object sender, EventArgs e) { // Allow or prevent paging depending on the user's selection.if (AllowPagingCheckBox.Checked) { ItemsGrid.AllowPaging = true; } else { ItemsGrid.AllowPaging = false; } // Re-bind the data to refresh the DataGrid control. ItemsGrid.DataSource = CreateDataSource(); ItemsGrid.DataBind(); } void Grid_Change(Object sender, DataGridPageChangedEventArgs e) { // For the DataGrid control to navigate to the correct page when paging is// allowed, the CurrentPageIndex property must be programmatically updated.// This process is usually accomplished in the event-handling method for the// PageIndexChanged event.// Set CurrentPageIndex to the page the user clicked. ItemsGrid.CurrentPageIndex = e.NewPageIndex; // Re-bind the data to refresh the DataGrid control. ItemsGrid.DataSource = CreateDataSource(); ItemsGrid.DataBind(); } </script> <head runat="server"> <title>DataGrid PageIndexChanged Example</title> </head> <body> <form id="form1" runat="server"> <h3>DataGrid PageIndexChanged Example</h3> Select whether to allow paging in the DataGrid control. <br /><br /> <b>Product List</b> <asp:DataGrid id="ItemsGrid" BorderColor="black" BorderWidth="1" CellPadding="3" AutoGenerateColumns="False" PageSize="10" AllowPaging="True" runat="server"> <HeaderStyle BackColor="#00aaaa"> </HeaderStyle> <Columns> <asp:BoundColumn DataField="IntegerValue" SortExpression="IntegerValue" HeaderText="Item"/> <asp:BoundColumn DataField="StringValue" SortExpression="StringValue" HeaderText="Description"/> <asp:BoundColumn DataField="CurrencyValue" HeaderText="Price" SortExpression="CurrencyValue" DataFormatString="{0:c}"> <ItemStyle HorizontalAlign="Right"> </ItemStyle> </asp:BoundColumn> </Columns> </asp:DataGrid> <hr /> <table cellpadding="5"> <tr> <td> <asp:CheckBox id="AllowPagingCheckBox" Text="Allow paging" AutoPostBack="True" Checked="True" OnCheckedChanged="Check_Change" runat="server"/> </td> </tr> </table> </form> </body> </html>
Windows 7, Windows Vista SP1 ou ultérieur, Windows XP SP3, Windows XP SP2 Édition x64, Windows Server 2008 (installation minimale non prise en charge), Windows Server 2008 R2 (installation minimale prise en charge avec SP1 ou version ultérieure), Windows Server 2003 SP2
Le .NET Framework ne prend pas en charge toutes les versions de chaque plateforme. Pour obtenir la liste des versions prises en charge, consultez Configuration requise du .NET Framework.
