GridView.OnRowCommand(GridViewCommandEventArgs) 方法
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
引發 RowCommand 事件。
protected:
virtual void OnRowCommand(System::Web::UI::WebControls::GridViewCommandEventArgs ^ e);protected virtual void OnRowCommand (System.Web.UI.WebControls.GridViewCommandEventArgs e);abstract member OnRowCommand : System.Web.UI.WebControls.GridViewCommandEventArgs -> unit
override this.OnRowCommand : System.Web.UI.WebControls.GridViewCommandEventArgs -> unitProtected Overridable Sub OnRowCommand (e As GridViewCommandEventArgs)參數
包含事件資料的 GridViewCommandEventArgs。
範例
具有原始程式碼的 Visual Studio 網站專案隨附于本主題： 下載。
下列範例示範如何為 RowCommand 事件提供事件處理方法。 按一下控制項指定資料列的 GridView [新增] 按鈕時，選取的客戶名稱會新增至 ListBox 控制項。
<%@ 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 ContactsGridView_RowCommand(Object sender, GridViewCommandEventArgs e)
{
// If multiple buttons are used in a GridView control, use the
// CommandName property to determine which button was clicked.
if(e.CommandName=="Add")
{
// Convert the row index stored in the CommandArgument
// property to an Integer.
int index = Convert.ToInt32(e.CommandArgument);
// Retrieve the row that contains the button clicked
// by the user from the Rows collection.
GridViewRow row = ContactsGridView.Rows[index];
// Create a new ListItem object for the contact in the row.
ListItem item = new ListItem();
item.Text = Server.HtmlDecode(row.Cells[2].Text) + " " +
Server.HtmlDecode(row.Cells[3].Text);
// If the contact is not already in the ListBox, add the ListItem
// object to the Items collection of the ListBox control.
if (!ContactsListBox.Items.Contains(item))
{
ContactsListBox.Items.Add(item);
}
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridView RowCommand Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridView RowCommand Example</h3>
<table width="100%">
<tr>
<td style="width:50%">
<asp:gridview id="ContactsGridView"
datasourceid="ContactsSource"
allowpaging="true"
autogeneratecolumns="false"
onrowcommand="ContactsGridView_RowCommand"
runat="server">
<columns>
<asp:buttonfield buttontype="Link"
commandname="Add"
text="Add"/>
<asp:boundfield datafield="ContactID"
headertext="Contact ID"/>
<asp:boundfield datafield="FirstName"
headertext="First Name"/>
<asp:boundfield datafield="LastName"
headertext="Last Name"/>
</columns>
</asp:gridview>
</td>
<td style="vertical-align:top; width:50%">
Contacts: <br/>
<asp:listbox id="ContactsListBox"
runat="server" Height="200px" Width="200px"/>
</td>
</tr>
</table>
<!-- This example uses Microsoft SQL Server and connects -->
<!-- to the AdventureWorks sample database. Use an ASP.NET -->
<!-- expression to retrieve the connection string value -->
<!-- from the Web.config file. -->
<asp:sqldatasource id="ContactsSource"
selectcommand="Select [ContactID], [FirstName], [LastName] From Person.Contact"
connectionstring="<%$ ConnectionStrings:AdventureWorks_DataConnectionString%>"
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 ContactsGridView_RowCommand(ByVal sender As Object, ByVal e As GridViewCommandEventArgs)
' If multiple buttons are used in a GridView control, use the
' CommandName property to determine which button was clicked.
If e.CommandName = "Add" Then
' Convert the row index stored in the CommandArgument
' property to an Integer.
Dim index As Integer = Convert.ToInt32(e.CommandArgument)
' Retrieve the row that contains the button clicked
' by the user from the Rows collection.
Dim row As GridViewRow = ContactsGridView.Rows(index)
' Create a new ListItem object for the contact in the row.
Dim item As New ListItem()
item.Text = Server.HtmlDecode(row.Cells(2).Text) & " " & _
Server.HtmlDecode(row.Cells(3).Text)
' If the contact is not already in the ListBox, add the ListItem
' object to the Items collection of the ListBox control.
If Not ContactsListBox.Items.Contains(item) Then
ContactsListBox.Items.Add(item)
End If
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>GridView RowCommand Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridView RowCommand Example</h3>
<table width="100%">
<tr>
<td style="width:50%">
<asp:gridview id="ContactsGridView"
datasourceid="ContactsSource"
allowpaging="true"
autogeneratecolumns="false"
onrowcommand="ContactsGridView_RowCommand"
runat="server">
<columns>
<asp:buttonfield buttontype="Link"
commandname="Add"
text="Add"/>
<asp:boundfield datafield="ContactID"
headertext="Contact ID"/>
<asp:boundfield datafield="FirstName"
headertext="First Name"/>
<asp:boundfield datafield="LastName"
headertext="Last Name"/>
</columns>
</asp:gridview>
</td>
<td style="vertical-align:top; width:50%">
Contacts: <br/>
<asp:listbox id="ContactsListBox"
runat="server" Height="200px" Width="200px"/>
</td>
</tr>
</table>
<!-- This example uses Microsoft SQL Server and connects -->
<!-- to the AdventureWorks sample database. Use an ASP.NET -->
<!-- expression to retrieve the connection string value -->
<!-- from the Web.config file. -->
<asp:sqldatasource id="ContactsSource"
selectcommand="Select [ContactID], [FirstName], [LastName] From Person.Contact"
connectionstring="<%$ ConnectionStrings:AdventureWorks_DataConnectionString%>"
runat="server"/>
</form>
</body>
</html>
備註
RowCommand按一下 控制項中的 GridView 按鈕時，就會引發 事件。 這可讓您提供事件處理方法，每當發生此事件時，都會執行自訂常式。
引發事件會透過委派叫用此事件處理常式。 如需詳細資訊，請參閱 處理和引發事件。
OnRowCommand 方法也允許衍生類別處理事件，而不用附加委派。 這是在衍生類別中處理事件的慣用技巧。
給繼承者的注意事項
當在衍生類別中覆寫 OnRowCommand(GridViewCommandEventArgs) 時，請確定呼叫基底類別的 OnRowCommand(GridViewCommandEventArgs) 方法，使已註冊的委派能接收到事件。
