DetailsViewCommandEventArgs.CommandSource 属性
定义
重要
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获取命令源。
public:
property System::Object ^ CommandSource { System::Object ^ get(); };public object CommandSource { get; }member this.CommandSource : objPublic ReadOnly Property CommandSource As Object属性值
表示命令源的 Object 类的实例。
示例
下面的代码示例演示如何使用 CommandSource 属性来确定两个 DetailsView 控件中的哪一个引发了 事件 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>
注解
CommandSource使用 属性访问表示命令源的 对象的属性。 在某些情况下，这将是 DetailsView 控件本身，在其他情况下，它将是单击的 Button 控件。
