DetailsViewCommandEventHandler Delegate
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Represents the method that handles the ItemCommand event of a DetailsView control.
public delegate void DetailsViewCommandEventHandler(System::Object ^ sender, DetailsViewCommandEventArgs ^ e);public delegate void DetailsViewCommandEventHandler(object sender, DetailsViewCommandEventArgs e);type DetailsViewCommandEventHandler = delegate of obj * DetailsViewCommandEventArgs -> unitPublic Delegate Sub DetailsViewCommandEventHandler(sender As Object, e As DetailsViewCommandEventArgs)Parameters
- sender
- Object
The source of the event.
A DetailsViewCommandEventArgs that contains the event data.
Examples
The following code example demonstrates how to programmatically add a DetailsViewCommandEventHandler delegate to the ItemCommand event of a DetailsView control. This example uses the single-file coding model.
<%@ 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 Page_Load(Object sender, EventArgs e)
{
// Create a new DetailsView object.
DetailsView customerDetailsView = new DetailsView();
// Set the DetailsView object's properties.
customerDetailsView.ID = "CustomerDetailsView";
customerDetailsView.DataSourceID = "DetailsViewSource";
customerDetailsView.AutoGenerateRows = true;
customerDetailsView.AllowPaging = true;
customerDetailsView.DataKeyNames = new String[1] { "CustomerID" };
// Add a button field to the DetailsView control.
ButtonField field = new ButtonField();
field.ButtonType = ButtonType.Link;
field.CausesValidation = false;
field.Text = "Add to List";
field.CommandName="Add";
customerDetailsView.Fields.Add(field);
// Programmatically register the event-handling method
// for the ItemDeleting event of a DetailsView control.
customerDetailsView.ItemCommand
+= new DetailsViewCommandEventHandler(
this.CustomerDetailsView_ItemCommand);
// Add the DetailsView object to the Controls collection
// of the PlaceHolder control.
DetailsViewPlaceHolder.Controls.Add(customerDetailsView);
}
void CustomerDetailsView_ItemCommand(Object sender,
DetailsViewCommandEventArgs e)
{
// Use the CommandName property to determine which button
// was clicked.
if (e.CommandName == "Add")
{
// Get the DetailsView control that raised the event.
DetailsView customerDetailsView = (DetailsView)e.CommandSource;
// Add the current customer to the customer list.
// Get the row that contains the company name. In this
// example, the company name is in the second row (index 1)
// of the DetailsView control.
DetailsViewRow row = customerDetailsView.Rows[1];
// Get the company's name from the appropriate cell.
// In this example, the company name is in the second cell
// (index 1) of the row.
String name = row.Cells[1].Text;
// Create a ListItem object with the company name.
ListItem item = new ListItem(name);
// Add the ListItem object to the ListBox, if the
// item doesn't already exist.
if (!CustomerListBox.Items.Contains(item))
{
CustomerListBox.Items.Add(item);
}
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>DetailsViewCommandEventHandler Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DetailsViewCommandEventHandler Example</h3>
<!-- Use a PlaceHolder control as the container for the -->
<!-- dynamically generated DetailsView control. -->
<asp:placeholder id="DetailsViewPlaceHolder"
runat="server"/>
<br/><br/>
Selected Customers:<br/>
<asp:listbox id="CustomerListBox"
runat="server"/>
<!-- 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="DetailsViewSource"
selectcommand="Select [CustomerID], [CompanyName], [Address],
[City], [PostalCode], [Country] From [Customers]"
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 Page_Load(ByVal sender As Object, ByVal e As EventArgs)
' Create a new DetailsView object.
Dim customerDetailsView As New DetailsView()
' Set the DetailsView object's properties.
customerDetailsView.ID = "CustomerDetailsView"
customerDetailsView.DataSourceID = "DetailsViewSource"
customerDetailsView.AutoGenerateRows = True
customerDetailsView.AllowPaging = True
Dim keyArray() As String = {"CustomerID"}
customerDetailsView.DataKeyNames = keyArray
' Add a button field to the DetailsView control.
Dim field As New ButtonField()
field.ButtonType = ButtonType.Link
field.CausesValidation = False
field.Text = "Add to List"
field.CommandName = "Add"
customerDetailsView.Fields.Add(field)
' Programmatically register the event-handling method
' for the ItemDeleting event of a DetailsView control.
AddHandler customerDetailsView.ItemCommand, _
AddressOf CustomerDetailsView_ItemCommand
' Add the DetailsView object to the Controls collection
' of the PlaceHolder control.
DetailsViewPlaceHolder.Controls.Add(customerDetailsView)
End Sub
Sub CustomerDetailsView_ItemCommand(ByVal sender As Object, _
ByVal e As DetailsViewCommandEventArgs)
' Use the CommandName property to determine which button
' was clicked.
If e.CommandName = "Add" Then
' Get the DetailsView control that raised the event.
Dim customerDetailsView As DetailsView = _
CType(e.CommandSource, DetailsView)
' Add the current customer to the customer list.
' Get the row that contains the company name. In this
' example, the company name is in the second row (index 1)
' of the DetailsView control.
Dim row As DetailsViewRow = customerDetailsView.Rows(1)
' Get the company's name from the appropriate cell.
' In this example, the company name is in the second cell
' (index 1) of the row.
Dim name As String = row.Cells(1).Text
' Create a ListItem object with the company name.
Dim item As New ListItem(name)
' Add the ListItem object to the ListBox, if the
' item doesn't already exist.
If Not CustomerListBox.Items.Contains(item) Then
CustomerListBox.Items.Add(item)
End If
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>DetailsViewCommandEventHandler Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DetailsViewCommandEventHandler Example</h3>
<!-- Use a PlaceHolder control as the container for the -->
<!-- dynamically generated DetailsView control. -->
<asp:placeholder id="DetailsViewPlaceHolder"
runat="server"/>
<br/><br/>
Selected Customers:<br/>
<asp:listbox id="CustomerListBox"
runat="server"/>
<!-- 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="DetailsViewSource"
selectcommand="Select [CustomerID], [CompanyName], [Address],
[City], [PostalCode], [Country] From [Customers]"
connectionstring=
"<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</form>
</body>
</html>
The following code example shows a code-behind coding model version of the previous example. For this example to work, you must copy the code below into the associated code-behind file.
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>DetailsViewCommandEventHandler Example</title>
</head>
<body>
<form id="Form1" runat="server">
<h3>DetailsViewCommandEventHandler Example</h3>
<!-- Use a PlaceHolder control as the container for the -->
<!-- dynamically generated DetailsView control. -->
<asp:placeholder id="DetailsViewPlaceHolder"
runat="server"/>
<br/><br/>
Selected Customers:<br/>
<asp:listbox id="CustomerListBox"
runat="server"/>
<!-- 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="DetailsViewSource"
selectcommand="Select [CustomerID], [CompanyName], [Address],
[City], [PostalCode], [Country] From [Customers]"
connectionstring="
<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</form>
</body>
</html>
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="DefaultVB.aspx.vb" Inherits="DefaultVB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>DetailsViewCommandEventHandler Example</title>
</head>
<body>
<form id="Form1" runat="server">
<h3>DetailsViewCommandEventHandler Example</h3>
<!-- Use a PlaceHolder control as the container for the -->
<!-- dynamically generated DetailsView control. -->
<asp:placeholder id="DetailsViewPlaceHolder"
runat="server"/>
<br/><br/>
Selected Customers:<br/>
<asp:listbox id="CustomerListBox"
runat="server"/>
<!-- 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="DetailsViewSource"
selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</form>
</body>
</html>
The following code example shows the code-behind file for the previous example.
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
// Create a new DetailsView object.
DetailsView customerDetailsView = new DetailsView();
// Set the DetailsView object's properties.
customerDetailsView.ID = "CustomerDetailsView";
customerDetailsView.DataSourceID = "DetailsViewSource";
customerDetailsView.AutoGenerateRows = true;
customerDetailsView.AllowPaging = true;
customerDetailsView.DataKeyNames = new String[1] { "CustomerID" };
// Add a button field to the DetailsView control.
ButtonField field = new ButtonField();
field.ButtonType = ButtonType.Link;
field.CausesValidation = false;
field.Text = "Add to List";
field.CommandName = "Add";
customerDetailsView.Fields.Add(field);
// Programmatically register the event-handling method
// for the ItemDeleting event of a DetailsView control.
customerDetailsView.ItemCommand += new DetailsViewCommandEventHandler(this.CustomerDetailsView_ItemCommand);
// Add the DetailsView object to the Controls collection
// of the PlaceHolder control.
DetailsViewPlaceHolder.Controls.Add(customerDetailsView);
}
void CustomerDetailsView_ItemCommand(Object sender, DetailsViewCommandEventArgs e)
{
// Use the CommandName property to determine which button
// was clicked.
if (e.CommandName == "Add")
{
// Get the DetailsView control that raised the event.
DetailsView customerDetailsView = (DetailsView)sender;
// Add the current customer to the customer list.
// Get the row that contains the company name. In this
// example, the company name is in the second row (index 1)
// of the DetailsView control.
DetailsViewRow row = customerDetailsView.Rows[1];
// Get the company's name from the appropriate cell.
// In this example, the company name is in the second cell
// (index 1) of the row.
String name = row.Cells[1].Text;
// Create a ListItem object with the company name.
ListItem item = new ListItem(name);
// Add the ListItem object to the ListBox, if the
// item doesn't already exist.
if (!CustomerListBox.Items.Contains(item))
{
CustomerListBox.Items.Add(item);
}
}
}
}
Partial Class DefaultVB
Inherits System.Web.UI.Page
Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
' Create a new DetailsView object.
Dim customerDetailsView As New DetailsView()
' Set the DetailsView object's properties.
customerDetailsView.ID = "CustomerDetailsView"
customerDetailsView.DataSourceID = "DetailsViewSource"
customerDetailsView.AutoGenerateRows = True
customerDetailsView.AllowPaging = True
Dim keyArray() As String = {"CustomerID"}
customerDetailsView.DataKeyNames = keyArray
' Add a button field to the DetailsView control.
Dim field As New ButtonField()
field.ButtonType = ButtonType.Link
field.CausesValidation = False
field.Text = "Add to List"
field.CommandName = "Add"
customerDetailsView.Fields.Add(field)
' Programmatically register the event-handling method
' for the ItemDeleting event of a DetailsView control.
AddHandler customerDetailsView.ItemCommand, AddressOf CustomerDetailsView_ItemCommand
' Add the DetailsView object to the Controls collection
' of the PlaceHolder control.
DetailsViewPlaceHolder.Controls.Add(customerDetailsView)
End Sub
Sub CustomerDetailsView_ItemCommand(ByVal sender As Object, ByVal e As DetailsViewCommandEventArgs)
' Use the CommandName property to determine which button
' was clicked.
If e.CommandName = "Add" Then
' Get the DetailsView control that raised the event.
Dim customerDetailsView As DetailsView = CType(sender, DetailsView)
' Add the current customer to the customer list.
' Get the row that contains the company name. In this
' example, the company name is in the second row (index 1)
' of the DetailsView control.
Dim row As DetailsViewRow = customerDetailsView.Rows(1)
' Get the company's name from the appropriate cell.
' In this example, the company name is in the second cell
' (index 1) of the row.
Dim name As String = row.Cells(1).Text
' Create a ListItem object with the company name.
Dim item As New ListItem(name)
' Add the ListItem object to the ListBox, if the
' item doesn't already exist.
If Not CustomerListBox.Items.Contains(item) Then
CustomerListBox.Items.Add(item)
End If
End If
End Sub
End Class
The following code example demonstrates how to declaratively add a DetailsViewCommandEventHandler delegate to the ItemCommand event of a DetailsView control.
<%@ 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 CustomerDetailView_ItemCommand(Object sender, DetailsViewCommandEventArgs e)
{
// Use the CommandName property to determine which button
// was clicked.
if (e.CommandName == "Add")
{
// Add the current store to the contact list.
// Get the row that contains the store name. In this
// example, the store name is in the second row (index 1)
// of the DetailsView control.
DetailsViewRow row = CustomerDetailView.Rows[1];
// Get the store's name from the appropriate cell.
// In this example, the store name is in the second cell
// (index 1) of the row.
String name = row.Cells[1].Text;
// Create a ListItem object with the store's name.
ListItem item = new ListItem(name);
// Add the ListItem object to the ListBox, if the
// item doesn't already exist.
if (!ContactListBox.Items.Contains(item))
{
ContactListBox.Items.Add(item);
}
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>
DetailsView ItemCommand Example</title>
</head>
<body>
<form id="Form1" runat="server">
<h3>
DetailsView ItemCommand Example</h3>
<asp:DetailsView ID="CustomerDetailView"
DataSourceID="DetailsViewSource"
AutoGenerateRows="false"
DataKeyNames="CustomerID"
AllowPaging="true"
OnItemCommand="CustomerDetailView_ItemCommand"
runat="server">
<FieldHeaderStyle BackColor="Navy" ForeColor="White" />
<Fields>
<asp:BoundField DataField="CustomerID" HeaderText="Store ID" />
<asp:BoundField DataField="CompanyName" HeaderText="Store Name" />
<asp:BoundField DataField="City" HeaderText="City" />
<asp:ButtonField CommandName="Add" Text="Add Contact" />
</Fields>
</asp:DetailsView>
<hr />
Contacts:<br />
<asp:ListBox ID="ContactListBox" runat="server" />
<!-- 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="DetailsViewSource" runat="server"
ConnectionString=
"<%$ ConnectionStrings:NorthWindConnectionString%>"
InsertCommand="INSERT INTO [Customers]([CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country]) VALUES (@CustomerID, @CompanyName, @Address, @City, @PostalCode, @Country)"
SelectCommand="Select [CustomerID], [CompanyName],
[Address], [City], [PostalCode], [Country] From
[Customers]">
</asp:SqlDataSource>
</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 CustomerDetailView_ItemCommand(ByVal sender As Object, ByVal e As DetailsViewCommandEventArgs)
' Use the CommandName property to determine which button
' was clicked.
If e.CommandName = "Add" Then
' Add the current store to the contact list.
' Get the row that contains the store name. In this
' example, the store name is in the second row (index 1)
' of the DetailsView control.
Dim row As DetailsViewRow = CustomerDetailView.Rows(1)
' Get the store's name from the appropriate cell.
' In this example, the store name is in the second cell
' (index 1) of the row.
Dim name As String = row.Cells(1).Text
' Create a ListItem object with the store's name.
Dim item As New ListItem(name)
' Add the ListItem object to the ListBox, if the
' item doesn't already exist.
If Not ContactListBox.Items.Contains(item) Then
ContactListBox.Items.Add(item)
End If
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>
DetailsView ItemCommand Example</title>
</head>
<body>
<form id="Form1" runat="server">
<h3>
DetailsView ItemCommand Example</h3>
<asp:DetailsView ID="CustomerDetailView"
DataSourceID="DetailsViewSource"
AutoGenerateRows="false"
DataKeyNames="CustomerID"
AllowPaging="true"
OnItemCommand="CustomerDetailView_ItemCommand"
runat="server">
<FieldHeaderStyle BackColor="Navy" ForeColor="White" />
<Fields>
<asp:BoundField DataField="CustomerID" HeaderText="Store ID" />
<asp:BoundField DataField="CompanyName" HeaderText="Store Name" />
<asp:BoundField DataField="City" HeaderText="City" />
<asp:ButtonField CommandName="Add" Text="Add Contact" />
</Fields>
</asp:DetailsView>
<hr />
Contacts:<br />
<asp:ListBox ID="ContactListBox" runat="server" />
<!-- 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="DetailsViewSource" runat="server"
ConnectionString=
"<%$ ConnectionStrings:NorthWindConnectionString%>"
InsertCommand="INSERT INTO [Customers]([CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country]) VALUES (@CustomerID, @CompanyName, @Address, @City, @PostalCode, @Country)"
SelectCommand="Select [CustomerID], [CompanyName],
[Address], [City], [PostalCode], [Country] From
[Customers]">
</asp:SqlDataSource>
</form>
</body>
</html>
Remarks
The DetailsView control raises the ItemCommand event when a button within a ButtonField, CommandField, or TemplateField row field is clicked. This allows you to provide an event handler that performs a custom routine whenever this event occurs.
Note
The DetailsView control also raises other specialized events when certain buttons are clicked (buttons with the CommandName property set to "Delete", "Insert", "Page", or "Update"). When using one of these buttons, you should consider using one of the specialized events provided by the control (such as ItemDeleted or ItemDeleting).
When you create a DetailsViewCommandEventHandler delegate, you identify the method that will handle the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate. For more information about event-handler delegates, see Handling and Raising Events.
Extension Methods
| GetMethodInfo(Delegate) |
Gets an object that represents the method represented by the specified delegate. |
Applies to
See also
Vertu í samstarfi við okkur á GitHub
Heimildina fyrir þetta efni er að finna á GitHub, þar sem þú getur líka búið til og farið yfir vandamál og sameinað beiðnir. Frekari upplýsingar er að finna í framlagshandbók okkar.
