GridView.PageIndex Propriété
Définition
Important
Certaines informations portent sur la préversion du produit qui est susceptible d’être en grande partie modifiée avant sa publication. Microsoft exclut toute garantie, expresse ou implicite, concernant les informations fournies ici.
Obtient ou définit l'index de la page actuellement affichée.
public:
virtual property int PageIndex { int get(); void set(int value); };[System.ComponentModel.Browsable(true)]
public virtual int PageIndex { get; set; }[<System.ComponentModel.Browsable(true)>]
member this.PageIndex : int with get, setPublic Overridable Property PageIndex As IntegerValeur de propriété
Index de base zéro de la page actuellement affichée.
- Attributs
Exceptions
La valeur affectée à la propriété PageIndex est inférieure à 0.
Exemples
L’exemple suivant montre comment utiliser la PageIndex propriété pour déterminer l’index de la page actuellement affichée dans le GridView contrôle. L’exemple montre également comment la PageIndex propriété peut être utilisée pour spécifier la page affichée après que l’utilisateur a sélectionné une valeur dans la ligne du pagineur.
<%@ Page language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void PageDropDownList_SelectedIndexChanged(Object sender, EventArgs e)
{
// Retrieve the pager row.
GridViewRow pagerRow = CustomersGridView.BottomPagerRow;
// Retrieve the PageDropDownList DropDownList from the bottom pager row.
DropDownList pageList = (DropDownList)pagerRow.Cells[0].FindControl("PageDropDownList");
// Set the PageIndex property to display that page selected by the user.
CustomersGridView.PageIndex = pageList.SelectedIndex;
}
protected void CustomersGridView_DataBound(Object sender, EventArgs e)
{
// Retrieve the pager row.
GridViewRow pagerRow = CustomersGridView.BottomPagerRow;
// Retrieve the DropDownList and Label controls from the row.
DropDownList pageList = (DropDownList)pagerRow.Cells[0].FindControl("PageDropDownList");
Label pageLabel = (Label)pagerRow.Cells[0].FindControl("CurrentPageLabel");
if(pageList != null)
{
// Create the values for the DropDownList control based on
// the total number of pages required to display the data
// source.
for(int i=0; i<CustomersGridView.PageCount; i++)
{
// Create a ListItem object to represent a page.
int pageNumber = i + 1;
ListItem item = new ListItem(pageNumber.ToString());
// If the ListItem object matches the currently selected
// page, flag the ListItem object as being selected. Because
// the DropDownList control is recreated each time the pager
// row gets created, this will persist the selected item in
// the DropDownList control.
if(i==CustomersGridView.PageIndex)
{
item.Selected = true;
}
// Add the ListItem object to the Items collection of the
// DropDownList.
pageList.Items.Add(item);
}
}
if(pageLabel != null)
{
// Calculate the current page number.
int currentPage = CustomersGridView.PageIndex + 1;
// Update the Label control with the current page information.
pageLabel.Text = "Page " + currentPage.ToString() +
" of " + CustomersGridView.PageCount.ToString();
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridView PagerTemplate Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridView PagerTemplate Example</h3>
<asp:gridview id="CustomersGridView"
datasourceid="CustomersSqlDataSource"
autogeneratecolumns="true"
allowpaging="true"
ondatabound="CustomersGridView_DataBound"
runat="server">
<pagerstyle forecolor="Blue"
backcolor="LightBlue"/>
<pagertemplate>
<table width="100%">
<tr>
<td style="width:70%">
<asp:label id="MessageLabel"
forecolor="Blue"
text="Select a page:"
runat="server"/>
<asp:dropdownlist id="PageDropDownList"
autopostback="true"
onselectedindexchanged="PageDropDownList_SelectedIndexChanged"
runat="server"/>
</td>
<td style="width:70%; text-align:right">
<asp:label id="CurrentPageLabel"
forecolor="Blue"
runat="server"/>
</td>
</tr>
</table>
</pagertemplate>
</asp:gridview>
<!-- This example uses Microsoft SQL Server and connects -->
<!-- to the Northwind sample database. Use an ASP.NET -->
<!-- expression to retrieve the connection string value -->
<!-- from the Web.config file. -->
<asp:sqldatasource id="CustomersSqlDataSource"
selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server">
</asp:sqldatasource>
</form>
</body>
</html>
<%@ Page language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Protected Sub PageDropDownList_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs)
' Retrieve the pager row.
Dim pagerRow As GridViewRow = CustomersGridView.BottomPagerRow
' Retrieve the PageDropDownList DropDownList from the bottom pager row.
Dim pageList As DropDownList = CType(pagerRow.Cells(0).FindControl("PageDropDownList"), DropDownList)
' Set the PageIndex property to display that page selected by the user.
CustomersGridView.PageIndex = pageList.SelectedIndex
End Sub
Protected Sub CustomersGridView_DataBound(ByVal sender As Object, ByVal e As EventArgs)
' Retrieve the pager row.
Dim pagerRow As GridViewRow = CustomersGridView.BottomPagerRow
' Retrieve the DropDownList and Label controls from the row.
Dim pageList As DropDownList = CType(pagerRow.Cells(0).FindControl("PageDropDownList"), DropDownList)
Dim pageLabel As Label = CType(pagerRow.Cells(0).FindControl("CurrentPageLabel"), Label)
If Not pageList Is Nothing Then
' Create the values for the DropDownList control based on
' the total number of pages required to display the data
' source.
Dim i As Integer
For i = 0 To CustomersGridView.PageCount - 1
' Create a ListItem object to represent a page.
Dim pageNumber As Integer = i + 1
Dim item As ListItem = New ListItem(pageNumber.ToString())
' If the ListItem object matches the currently selected
' page, flag the ListItem object as being selected. Because
' the DropDownList control is recreated each time the pager
' row gets created, this will persist the selected item in
' the DropDownList control.
If i = CustomersGridView.PageIndex Then
item.Selected = True
End If
' Add the ListItem object to the Items collection of the
' DropDownList.
pageList.Items.Add(item)
Next i
End If
If Not pageLabel Is Nothing Then
' Calculate the current page number.
Dim currentPage As Integer = CustomersGridView.PageIndex + 1
' Update the Label control with the current page information.
pageLabel.Text = "Page " & currentPage.ToString() & _
" of " & CustomersGridView.PageCount.ToString()
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridView PagerTemplate Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridView PagerTemplate Example</h3>
<asp:gridview id="CustomersGridView"
datasourceid="CustomersSqlDataSource"
autogeneratecolumns="true"
allowpaging="true"
ondatabound="CustomersGridView_DataBound"
runat="server">
<pagerstyle forecolor="Blue"
backcolor="LightBlue"/>
<pagertemplate>
<table width="100%">
<tr>
<td style="width:70%">
<asp:label id="MessageLabel"
forecolor="Blue"
text="Select a page:"
runat="server"/>
<asp:dropdownlist id="PageDropDownList"
autopostback="true"
onselectedindexchanged="PageDropDownList_SelectedIndexChanged"
runat="server"/>
</td>
<td style="width:70%; text-align:right">
<asp:label id="CurrentPageLabel"
forecolor="Blue"
runat="server"/>
</td>
</tr>
</table>
</pagertemplate>
</asp:gridview>
<!-- This example uses Microsoft SQL Server and connects -->
<!-- to the Northwind sample database. Use an ASP.NET -->
<!-- expression to retrieve the connection string value -->
<!-- from the Web.config file. -->
<asp:sqldatasource id="CustomersSqlDataSource"
selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server">
</asp:sqldatasource>
</form>
</body>
</html>
Remarques
Lorsque la fonctionnalité de pagination est activée (en définissant la AllowPaging propriété sur ), utilisez la PageIndex propriété truepour déterminer l’index de la page actuellement affichée. Vous pouvez également utiliser cette propriété pour modifier par programmation la page affichée.