FormView.HeaderRow Proprietà
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.
Ottiene l'oggetto FormViewRow che rappresenta la riga dell'intestazione in un controllo FormView.
public:
virtual property System::Web::UI::WebControls::FormViewRow ^ HeaderRow { System::Web::UI::WebControls::FormViewRow ^ get(); };[System.ComponentModel.Browsable(false)]
public virtual System.Web.UI.WebControls.FormViewRow HeaderRow { get; }[<System.ComponentModel.Browsable(false)>]
member this.HeaderRow : System.Web.UI.WebControls.FormViewRowPublic Overridable ReadOnly Property HeaderRow As FormViewRowValore della proprietà
Un oggetto FormViewRow che rappresenta la riga dell'intestazione in un controllo FormView.
- Attributi
Esempio
Nell'esempio seguente viene illustrato come utilizzare la proprietà per modificare a HeaderRow livello di codice le proprietà della riga di intestazione durante l'evento ItemCreated .
<%@ 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)
{
// Use the HeaderRow property to retrieve the header row.
FormViewRow header = EmployeeFormView.HeaderRow;
// Retrieve the HeaderLabel Label control from the header row.
Label headerLabel = (Label)header.FindControl("HeaderLabel");
if(headerLabel != null)
{
// Display the current page number.
int currentPage = EmployeeFormView.PageIndex + 1;
headerLabel.Text = "Page " + currentPage.ToString();
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>FormView HeaderTemplate Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>FormView HeaderTemplate Example</h3>
<asp:formview id="EmployeeFormView"
datasourceid="EmployeeSource"
allowpaging="true"
datakeynames="EmployeeID"
onitemcreated="EmployeeFormView_ItemCreated"
runat="server">
<headertemplate>
<table>
<tr>
<td>
<asp:image id="LogoImage"
imageurl="~/Images/LogoImage.jpg"
alternatetext="Our Logo"
runat="server"/>
</td>
<td>
<asp:label id="HeaderLabel"
runat="server"/>
</td>
</tr>
</table>
</headertemplate>
<headerstyle horizontalalign="Center"
forecolor="White"
backcolor="LightBlue"/>
<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>
<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)
' Use the HeaderRow property to retrieve the header row.
Dim header As FormViewRow = EmployeeFormView.HeaderRow
' Retrieve the HeaderLabel Label control from the header row.
Dim headerLabel As Label = CType(header.FindControl("HeaderLabel"), Label)
If headerLabel IsNot Nothing Then
' Display the current page number.
Dim currentPage As Integer = EmployeeFormView.PageIndex + 1
headerLabel.Text = "Page " & currentPage.ToString()
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>FormView HeaderTemplate Example</title>
</head>
<body>
<form id="Form1" runat="server">
<h3>FormView HeaderTemplate Example</h3>
<asp:formview id="EmployeeFormView"
datasourceid="EmployeeSource"
allowpaging="true"
datakeynames="EmployeeID"
onitemcreated="EmployeeFormView_ItemCreated"
runat="server">
<headertemplate>
<table>
<tr>
<td>
<asp:image id="LogoImage"
imageurl="~/Images/LogoImage.jpg"
alternatetext="Our Logo"
runat="server"/>
</td>
<td>
<asp:label id="HeaderLabel"
runat="server"/>
</td>
</tr>
</table>
</headertemplate>
<headerstyle horizontalalign="Center"
forecolor="White"
backcolor="LightBlue"/>
<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>
<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
La riga di intestazione viene visualizzata nella parte superiore del FormView controllo quando viene impostata la HeaderText proprietà o HeaderTemplate . Utilizzare la HeaderRow proprietà per accedere a livello di codice all'oggetto FormViewRow che rappresenta la riga di intestazione.
Nota
La HeaderRow proprietà è disponibile solo dopo che il FormView controllo crea la riga di intestazione nell'evento ItemCreated .
Questa proprietà viene comunemente usata quando è necessario modificare a livello di codice la riga di intestazione, ad esempio quando si aggiunge contenuto personalizzato. Tutte le modifiche apportate alla HeaderRow proprietà devono essere eseguite dopo il rendering del FormView controllo. In caso contrario, il FormView controllo sovrascrive eventuali modifiche.
