FormView.HeaderRow Propriedade
Definição
Importante
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Obtém o objeto FormViewRow que representa a linha de cabeçalho em um controle 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 FormViewRowValor da propriedade
Um FormViewRow que representa a linha de cabeçalho em um controle FormView.
- Atributos
Exemplos
O exemplo a seguir demonstra como usar a HeaderRow propriedade para modificar programaticamente as propriedades da linha de cabeçalho durante o ItemCreated evento.
<%@ 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>
Comentários
A linha de cabeçalho é exibida na parte superior do FormView controle quando a HeaderText propriedade ou HeaderTemplate é definida. Use a HeaderRow propriedade para acessar programaticamente o FormViewRow objeto que representa a linha de cabeçalho.
Observação
A HeaderRow propriedade só estará disponível depois que o FormView controle criar a linha de cabeçalho no ItemCreated evento.
Essa propriedade é comumente usada quando você precisa manipular programaticamente a linha de cabeçalho, por exemplo, ao adicionar conteúdo personalizado. Qualquer modificação na HeaderRow propriedade deve ser executada depois que o FormView controle tiver sido renderizado; caso contrário, o FormView controle substituirá as alterações.
