GridView.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 GridView 控制項中已選取資料列的資料索引鍵值。
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
GridView 控制項中已選取資料列的資料索引鍵值。
- 屬性
範例
下列範例示範如何使用 SelectedValue 屬性來判斷 控制項中 GridView 所選資料列的資料索引鍵值。
<%@ 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 CustomersGridView_SelectedIndexChanged(Object sender, EventArgs e)
{
// Display the primary key value of the selected row.
Message.Text = "The primary key value of the selected row is " +
CustomersGridView.SelectedValue.ToString() + ".";
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridView SelectedValue Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridView SelectedValue Example</h3>
<asp:label id="Message"
forecolor="Red"
runat="server"/>
<br/><br/>
<asp:gridview id="CustomersGridView"
datasourceid="CustomersSource"
allowpaging="true"
autogeneratecolumns="true"
autogenerateselectbutton="true"
datakeynames="CustomerID"
onselectedindexchanged="CustomersGridView_SelectedIndexChanged"
runat="server">
<selectedrowstyle backcolor="LightBlue"
forecolor="DarkBlue"/>
</asp:gridview>
<!-- 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="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 CustomersGridView_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs)
' Display the primary key value of the selected row.
Message.Text = "The primary key value of the selected row is " & _
CustomersGridView.SelectedValue.ToString() & "."
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridView SelectedValue Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridView SelectedValue Example</h3>
<asp:label id="Message"
forecolor="Red"
runat="server"/>
<br/><br/>
<asp:gridview id="CustomersGridView"
datasourceid="CustomersSource"
allowpaging="true"
autogeneratecolumns="true"
autogenerateselectbutton="true"
datakeynames="CustomerID"
onselectedindexchanged="CustomersGridView_SelectedIndexChanged"
runat="server">
<selectedrowstyle backcolor="LightBlue"
forecolor="DarkBlue"/>
</asp:gridview>
<!-- 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>
備註
DataKeyNames當屬性設定為以逗號分隔的功能變數名稱清單，代表資料來源的主鍵時， GridView 控制項會自動使用指定欄位或欄位的值，為控制項中的每個資料列建立 DataKey 物件。 然後，物件 DataKey 會加入至控制項的 DataKeys 集合。 一般而言， DataKeys 屬性是用來擷取 DataKey 控制項中特定資料列的物件 GridView 。 不過，如果您只需要擷取 DataKey 目前選取之資料列的物件，只要使用 SelectedDataKey 屬性做為快捷方式即可。 做為進一步的快捷方式，您可以使用 屬性，直接判斷所選取資料列 SelectedValue 第一個索引鍵欄位的資料索引鍵值。
如果您要建立 ControlParameter 物件，而且想要存取第一個欄位以外的索引鍵欄位，請使用 SelectedDataKey 屬性。 如需範例，請參閱 SelectedDataKey。
