注意：這個屬性是 .NET Framework 2.0 版的新功能。
取得或設定
GridView 控制項中已選取資料列的索引。
命名空間： System.Web.UI.WebControls
組件： System.Web (在 system.web.dll 中)
<BindableAttribute(True)> _
Public Overridable Property SelectedIndex As Integer
Dim instance As GridView
Dim value As Integer
value = instance.SelectedIndex
instance.SelectedIndex = value
[BindableAttribute(true)]
public virtual int SelectedIndex { get; set; }
[BindableAttribute(true)]
public:
virtual property int SelectedIndex {
int get ();
void set (int value);
}
/** @property */
public int get_SelectedIndex ()
/** @property */
public void set_SelectedIndex (int value)
public function get SelectedIndex () : int
public function set SelectedIndex (value : int)
屬性值
GridView 控制項中已選取資料列之以零起始的索引。預設值為 -1，表示目前未選取任何資料列。
使用 SelectedIndex 屬性決定 GridView 控制項中目前已選取資料列的索引。您也可以使用這個屬性以程式設計的方式選取控制項中的資料列。如果要清除資料列的選取，請將這個屬性設為 -1。可以使用 SelectedRowStyle 屬性自訂目前已選取資料列的外觀。若要存取目前已選取的資料列，請使用 SelectedRow 屬性。
下列程式碼範例示範如何使用 SelectedIndex 屬性，在控制項起始顯示時選取 GridView 控制項的第二個資料列。
<%@ Page language="VB" %>
<script runat="server">
Sub CustomersGridView_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs)
' Get the currently selected row using the SelectedRow property.
Dim row As GridViewRow = CustomersGridView.SelectedRow
' Display the company name from the selected row.
' In this example, the third column (index 2) contains
' the company name.
Message.Text = "You selected " & row.Cells(2).Text & "."
End Sub
Sub CustomersGridView_SelectedIndexChanging(ByVal sender As Object, ByVal e As GridViewSelectEventArgs)
' Get the currently selected row. Because the SelectedIndexChanging event
' occurs before the select operation in the GridView control, the
' SelectedRow property cannot be used. Instead, use the Rows collection
' and the NewSelectedIndex property of the e argument passed to this
' event handler.
Dim row As GridViewRow = CustomersGridView.Rows(e.NewSelectedIndex)
' You can cancel the select operation by using the Cancel
' property. For this example, if the user selects a customer with
' the ID "ANATR", the select operation is canceled and an error message
' is displayed.
If row.Cells(1).Text = "ANATR" Then
e.Cancel = True
Message.Text = "You cannot select " + row.Cells(2).Text & "."
End If
End Sub
</script>
<html>
<body>
<form runat="server">
<h3>GridView Select Example</h3>
<asp:gridview id="CustomersGridView"
datasourceid="CustomersSource"
autogeneratecolumns="true"
autogenerateselectbutton="true"
allowpaging="true"
selectedindex="0"
onselectedindexchanged="CustomersGridView_SelectedIndexChanged"
onselectedindexchanging="CustomersGridView_SelectedIndexChanging"
runat="server">
<selectedrowstyle backcolor="LightCyan"
forecolor="DarkBlue"
font-bold="true"/>
</asp:gridview>
<br/>
<asp:label id="Message"
forecolor="Red"
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="CustomersSource"
selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</form>
</body>
</html>
<%@ Page language="C#" %>
<script runat="server">
void CustomersGridView_SelectedIndexChanged(Object sender, EventArgs e)
{
// Get the currently selected row using the SelectedRow property.
GridViewRow row = CustomersGridView.SelectedRow;
// Display the company name from the selected row.
// In this example, the third column (index 2) contains
// the company name.
Message.Text = "You selected " + row.Cells[2].Text + ".";
}
void CustomersGridView_SelectedIndexChanging(Object sender, GridViewSelectEventArgs e)
{
// Get the currently selected row. Because the SelectedIndexChanging event
// occurs before the select operation in the GridView control, the
// SelectedRow property cannot be used. Instead, use the Rows collection
// and the NewSelectedIndex property of the e argument passed to this
// event handler.
GridViewRow row = CustomersGridView.Rows[e.NewSelectedIndex];
// You can cancel the select operation by using the Cancel
// property. For this example, if the user selects a customer with
// the ID "ANATR", the select operation is canceled and an error message
// is displayed.
if (row.Cells[1].Text == "ANATR")
{
e.Cancel = true;
Message.Text = "You cannot select " + row.Cells[2].Text + ".";
}
}
</script>
<html>
<body>
<form runat="server">
<h3>GridView Select Example</h3>
<asp:gridview id="CustomersGridView"
datasourceid="CustomersSource"
autogeneratecolumns="true"
autogenerateselectbutton="true"
allowpaging="true"
selectedindex="0"
onselectedindexchanged="CustomersGridView_SelectedIndexChanged"
onselectedindexchanging="CustomersGridView_SelectedIndexChanging"
runat="server">
<selectedrowstyle backcolor="LightCyan"
forecolor="DarkBlue"
font-bold="true"/>
</asp:gridview>
<br/>
<asp:label id="Message"
forecolor="Red"
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="CustomersSource"
selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</form>
</body>
</html>
Windows 98、 Windows 2000 SP4、 Windows Server 2003、 Windows XP Media Center Edition、 Windows XP Professional x64 Edition、 Windows XP SP2、 Windows XP Starter Edition
.NET Framework 並不支援各種平台的所有版本。如需支援平台版本的相關資訊，請參閱系統需求一節的內容。
.NET Framework
支援版本：2.0