DetailsViewCommandEventArgs.CommandSource Proprietà
Definizione
Importante
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Ottiene l'origine del comando.
public:
property System::Object ^ CommandSource { System::Object ^ get(); };public object CommandSource { get; }member this.CommandSource : objPublic ReadOnly Property CommandSource As ObjectValore della proprietà
Istanza della classe Object che rappresenta l'origine del comando.
Esempio
Nell'esempio di codice seguente viene illustrato come usare la CommandSource proprietà per determinare quale di due DetailsView controlli ha generato l'evento ItemCommand .
<%@ 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 ItemDetailsView_ItemCommand(Object sender,
DetailsViewCommandEventArgs e)
{
// Use the CommandName property to determine which button
// was clicked.
if (e.CommandName == "Add")
{
// Because this event handler is used for two different
// DetailsView controls, use the CommandSource property
// to get the DetailsView control that raised the event.
DetailsView view = (DetailsView)e.CommandSource;
// Determine which ListBox control to update based on the
// ID of the DetailsView control that raised the event.
ListBox list;
if (view.ID == "CustomerDetailsView")
{
list = CustomerListBox;
}
else
{
list = EmployeesListBox;
}
// Add the selected item to the appropriate ListBox control.
// Get the row that contains the value to add. For this
// example, get the second row (index 1) of the DetailsView
// control.
DetailsViewRow row = view.Rows[1];
// Get the value from the appropriate cell. For this
// example, get the value of the second cell (index 1)
// of the row.
String value = row.Cells[1].Text;
// Create a ListItem object using the value.
ListItem item = new ListItem(value);
// Add the ListItem object to the ListBox control, if the
// item does not already exist.
if (!list.Items.Contains(item))
{
list.Items.Add(item);
}
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>DetailsViewCommandEventArgs CommandSource Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DetailsViewCommandEventArgs CommandSource Example</h3>
<table border="0">
<tr valign="top">
<td>
<asp:detailsview id="CustomerDetailsView"
datasourceid="CustomerSource"
allowpaging="true"
autogeneraterows="true"
onitemcommand="ItemDetailsView_ItemCommand"
runat="server">
<fields>
<asp:buttonfield buttontype="Link"
causesvalidation="false"
text="Add to List"
commandname="Add"/>
</fields>
</asp:detailsview>
</td>
<td>
<asp:detailsview id="EmployeesDetailsView"
datasourceid="EmployeesSource"
allowpaging="true"
autogeneraterows="true"
onitemcommand="ItemDetailsView_ItemCommand"
runat="server">
<fields>
<asp:buttonfield buttontype="Link"
causesvalidation="false"
text="Add to List"
commandname="Add"/>
</fields>
</asp:detailsview>
</td>
</tr>
<tr>
<td>
Selected Customers:<br/>
<asp:listbox id="CustomerListBox"
runat="server"/>
</td>
<td>
Selected Employees:<br/>
<asp:listbox id="EmployeesListBox"
runat="server"/>
</td>
</tr>
</table>
<!-- 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="CustomerSource"
selectcommand="Select [CustomerID], [CompanyName], [Address],
[City], [PostalCode], [Country] From [Customers]"
connectionstring=
"<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
<asp:sqldatasource id="EmployeesSource"
selectcommand="Select [EmployeeID], [FirstName], [LastName],
[Title] From [Employees]"
connectionstring=
"<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</form>
</body>
</html>
<%@ page language="VB" autoeventwireup="false" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Sub ItemDetailsView_ItemCommand(ByVal sender As Object, _
ByVal e As DetailsViewCommandEventArgs) _
Handles CustomerDetailsView.ItemCommand, _
EmployeesDetailsView.ItemCommand
' Use the CommandName property to determine which button
' was clicked.
If e.CommandName = "Add" Then
' Because this event handler is used for two different
' DetailsView controls, use the CommandSource property
' to get the DetailsView control that raised the event.
Dim view As DetailsView = CType(e.CommandSource, DetailsView)
' Determine which ListBox control to update based on the
' ID of the DetailsView control that raised the event.
Dim list As ListBox
If view.ID = "CustomerDetailsView" Then
list = CustomerListBox
Else
list = EmployeesListBox
End If
' Add the selected item to the appropriate ListBox control.
' Get the row that contains the value to add. For this
' example, get the second row (index 1) of the DetailsView
' control.
Dim row As DetailsViewRow = view.Rows(1)
' Get the value from the appropriate cell. For this
' example, get the value of the second cell (index 1)
' of the row.
Dim value As String = row.Cells(1).Text
' Create a ListItem object using the value.
Dim item As New ListItem(value)
' Add the ListItem object to the ListBox control, if the
' item does not already exist.
If Not list.Items.Contains(item) Then
list.Items.Add(item)
End If
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>DetailsViewCommandEventArgs CommandSource Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DetailsViewCommandEventArgs CommandSource Example</h3>
<table border="0">
<tr valign="top">
<td>
<asp:detailsview id="CustomerDetailsView"
datasourceid="CustomerSource"
allowpaging="true"
autogeneraterows="true"
onitemcommand="ItemDetailsView_ItemCommand"
runat="server">
<fields>
<asp:buttonfield buttontype="Link"
causesvalidation="false"
text="Add to List"
commandname="Add"/>
</fields>
</asp:detailsview>
</td>
<td>
<asp:detailsview id="EmployeesDetailsView"
datasourceid="EmployeesSource"
allowpaging="true"
autogeneraterows="true"
onitemcommand="ItemDetailsView_ItemCommand"
runat="server">
<fields>
<asp:buttonfield buttontype="Link"
causesvalidation="false"
text="Add to List"
commandname="Add"/>
</fields>
</asp:detailsview>
</td>
</tr>
<tr>
<td>
Selected Customers:<br/>
<asp:listbox id="CustomerListBox"
runat="server"/>
</td>
<td>
Selected Employees:<br/>
<asp:listbox id="EmployeesListBox"
runat="server"/>
</td>
</tr>
</table>
<!-- 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="CustomerSource"
selectcommand="Select [CustomerID], [CompanyName], [Address],
[City], [PostalCode], [Country] From [Customers]"
connectionstring=
"<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
<asp:sqldatasource id="EmployeesSource"
selectcommand="Select [EmployeeID], [FirstName], [LastName],
[Title] From [Employees]"
connectionstring=
"<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</form>
</body>
</html>
Commenti
Utilizzare la CommandSource proprietà per accedere alle proprietà dell'oggetto che rappresenta l'origine del comando. In alcuni casi, questo sarà il controllo stesso e in altri casi sarà il DetailsViewButton controllo che è stato fatto clic.
Si applica a
Vedi anche
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