FormView.ItemCreated Evento
Definizione
Importante
Alcune informazioni sono relative alla release non definitiva del prodotto, che potrebbe subire modifiche significative prima della release definitiva. Microsoft non riconosce alcuna garanzia, espressa o implicita, in merito alle informazioni qui fornite.
Si verifica dopo che in un controllo FormView sono state create tutte le righe.
public:
event EventHandler ^ ItemCreated;public event EventHandler ItemCreated;member this.ItemCreated : EventHandler Public Custom Event ItemCreated As EventHandler Tipo evento
Esempio
Nell'esempio seguente viene illustrato come utilizzare l'evento ItemCreated per aggiornare il testo di un Label controllo contenuto nella riga del cercapersone.
<%@ 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">
void EmployeeFormView_ItemCreated(Object sender, EventArgs e)
{
// Get the pager row.
FormViewRow pagerRow = EmployeeFormView.BottomPagerRow;
// Get the Label controls that display the current page information
// from the pager row.
Label pageNum = (Label)pagerRow.Cells[0].FindControl("PageNumberLabel");
Label totalNum = (Label)pagerRow.Cells[0].FindControl("TotalPagesLabel");
if ((pageNum != null) && (totalNum != null))
{
// Update the Label controls with the current page values.
int page = EmployeeFormView.PageIndex + 1;
int count = EmployeeFormView.PageCount;
pageNum.Text = page.ToString();
totalNum.Text = count.ToString();
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>FormView PagerTemplate Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>FormView PagerTemplate Example</h3>
<asp:formview id="EmployeeFormView"
datasourceid="EmployeeSource"
allowpaging="true"
datakeynames="EmployeeID"
onitemcreated="EmployeeFormView_ItemCreated"
runat="server">
<itemtemplate>
<table>
<tr>
<td>
<asp:image id="EmployeeImage"
imageurl='<%# Eval("PhotoPath") %>'
alternatetext='<%# Eval("LastName") %>'
runat="server"/>
</td>
<td>
<h3><%# Eval("FirstName") %> <%# Eval("LastName") %></h3>
<%# Eval("Title") %>
</td>
</tr>
</table>
</itemtemplate>
<pagertemplate>
<table width="100%">
<tr>
<td>
<asp:linkbutton id="PreviousButton"
text="<"
commandname="Page"
commandargument="Prev"
runat="Server"/>
<asp:linkbutton id="NextButton"
text=">"
commandname="Page"
commandargument="Next"
runat="Server"/>
</td>
<td align="right">
Page <asp:label id="PageNumberLabel" runat="server"/>
of <asp:label id="TotalPagesLabel" runat="server"/>
</td>
</tr>
</table>
</pagertemplate>
<pagersettings position="Bottom"
mode="NextPrevious"/>
</asp:formview>
<!-- 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="EmployeeSource"
selectcommand="Select [EmployeeID], [LastName], [FirstName], [Title], [PhotoPath] From [Employees]"
connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</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">
Sub EmployeeFormView_ItemCreated(ByVal sender As Object, ByVal e As EventArgs)
' Get the pager row.
Dim pagerRow As FormViewRow = EmployeeFormView.BottomPagerRow
' Get the Label controls that display the current page information
' from the pager row.
Dim pageNum As Label = CType(pagerRow.Cells(0).FindControl("PageNumberLabel"), Label)
Dim totalNum As Label = CType(pagerRow.Cells(0).FindControl("TotalPagesLabel"), Label)
If pageNum IsNot Nothing And totalNum IsNot Nothing Then
' Update the Label controls with the current page values.
Dim page As Integer = EmployeeFormView.PageIndex + 1
Dim count As Integer = EmployeeFormView.PageCount
pageNum.Text = page.ToString()
totalNum.Text = count.ToString()
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>FormView PagerTemplate Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>FormView PagerTemplate Example</h3>
<asp:formview id="EmployeeFormView"
datasourceid="EmployeeSource"
allowpaging="true"
datakeynames="EmployeeID"
onitemcreated="EmployeeFormView_ItemCreated"
runat="server">
<itemtemplate>
<table>
<tr>
<td>
<asp:image id="EmployeeImage"
imageurl='<%# Eval("PhotoPath") %>'
alternatetext='<%# Eval("LastName") %>'
runat="server"/>
</td>
<td>
<h3><%# Eval("FirstName") %> <%# Eval("LastName") %></h3>
<%# Eval("Title") %>
</td>
</tr>
</table>
</itemtemplate>
<pagertemplate>
<table width="100%">
<tr>
<td>
<asp:linkbutton id="PreviousButton"
text="<"
commandname="Page"
commandargument="Prev"
runat="Server"/>
<asp:linkbutton id="NextButton"
text=">"
commandname="Page"
commandargument="Next"
runat="Server"/>
</td>
<td align="right">
Page <asp:label id="PageNumberLabel" runat="server"/>
of <asp:label id="TotalPagesLabel" runat="server"/>
</td>
</tr>
</table>
</pagertemplate>
<pagersettings position="Bottom"
mode="NextPrevious"/>
</asp:formview>
<!-- 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="EmployeeSource"
selectcommand="Select [EmployeeID], [LastName], [FirstName], [Title], [PhotoPath] From [Employees]"
connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</form>
</body>
</html>
Commenti
L'evento ItemCreated viene generato dopo la creazione di tutte le righe in un FormView controllo . Ciò può verificarsi quando viene eseguito il rendering del controllo per la prima volta o quando l'utente passa a un altro record. È possibile utilizzare questo evento per fornire un metodo di gestione degli eventi che esegue una routine personalizzata, ad esempio l'aggiunta o la modifica del contenuto di una riga, ogni volta che si verifica questo evento.
Nota
L'evento si verifica prima che ItemCreated il FormView controllo sia associato ai dati. Per modificare il valore di un campo associato, utilizzare l'evento DataBound .
È possibile accedere alle righe di intestazione, piè di pagina e pager nel FormView controllo usando rispettivamente le HeaderRowproprietà , FooterRow, TopPagerRowo BottomPagerRow . Per accedere alla riga di dati, utilizzare la Row proprietà .
Per altre informazioni su come gestire gli eventi, vedere la gestione e generazione di eventi.
