FormView.SelectedValue 屬性
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。
取得 FormView 控制項中目前資料錄的資料索引鍵值。
public:
property System::Object ^ SelectedValue { System::Object ^ get(); };[System.ComponentModel.Browsable(false)]
public object SelectedValue { get; }[<System.ComponentModel.Browsable(false)>]
member this.SelectedValue : objPublic ReadOnly Property SelectedValue As Object屬性值
FormView 控制項中目前資料錄的資料索引鍵值。
- 屬性
範例
下列範例示範如何使用 SelectedValue 屬性來判斷索引鍵欄位的值。
<%@ 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 EmployeeFormView_ItemCreated(Object sender, EventArgs e)
{
MessageLabel.Text = "The key value is " + EmployeeFormView.SelectedValue.ToString() + ".";
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>FormView SelectedValue Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>FormView SelectedValue Example</h3>
<asp:formview id="EmployeeFormView"
datasourceid="EmployeeSource"
allowpaging="true"
datakeynames="EmployeeID"
onitemcreated="EmployeeFormView_ItemCreated"
runat="server">
<itemtemplate>
<table>
<tr>
<td>
<asp:image id="EmployeeImage"
imageurl='<%# Eval("PhotoPath") %>'
alternatetext='<%# Eval("LastName") %>'
runat="server"/>
</td>
<td>
<h3><%# Eval("FirstName") %> <%# Eval("LastName") %></h3>
<%# Eval("Title") %>
</td>
</tr>
</table>
</itemtemplate>
</asp:formview>
<br/><br/>
<asp:label id="MessageLabel"
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="EmployeeSource"
selectcommand="Select [EmployeeID], [LastName], [FirstName], [Title], [PhotoPath] From [Employees]"
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 EmployeeFormView_ItemCreated(ByVal sender As Object, ByVal e As EventArgs)
MessageLabel.Text = "The key value is " & EmployeeFormView.SelectedValue.ToString() & "."
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>FormView SelectedValue Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>FormView SelectedValue Example</h3>
<asp:formview id="EmployeeFormView"
datasourceid="EmployeeSource"
allowpaging="true"
datakeynames="EmployeeID"
onitemcreated="EmployeeFormView_ItemCreated"
runat="server">
<itemtemplate>
<table>
<tr>
<td>
<asp:image id="EmployeeImage"
imageurl='<%# Eval("PhotoPath") %>'
alternatetext='<%# Eval("LastName") %>'
runat="server"/>
</td>
<td>
<h3><%# Eval("FirstName") %> <%# Eval("LastName") %></h3>
<%# Eval("Title") %>
</td>
</tr>
</table>
</itemtemplate>
</asp:formview>
<br/><br/>
<asp:label id="MessageLabel"
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="EmployeeSource"
selectcommand="Select [EmployeeID], [LastName], [FirstName], [Title], [PhotoPath] From [Employees]"
connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</form>
</body>
</html>
備註
DataKeyNames設定屬性時， FormView 控制項會自動建立 DataKey 物件，其中包含目前記錄之 屬性中 DataKeyNames 所欄欄位的索引鍵/值組。 物件 DataKey 代表目前記錄的主鍵欄位或欄位，並儲存在 屬性中 DataKey 。 您可以使用 SelectedValue 屬性做為快捷方式，而不是使用 DataKey 屬性來存取資料索引鍵值。
注意
DataKeyNames當屬性列出多個欄位時，這個屬性會傳回列出的第一個欄位的值。