ListView.SelectedDataKey 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 ListView 控制項中所選取項目的資料索引鍵值。
public:
virtual property System::Web::UI::WebControls::DataKey ^ SelectedDataKey { System::Web::UI::WebControls::DataKey ^ get(); };[System.ComponentModel.Browsable(false)]
public virtual System.Web.UI.WebControls.DataKey SelectedDataKey { get; }[<System.ComponentModel.Browsable(false)>]
member this.SelectedDataKey : System.Web.UI.WebControls.DataKeyPublic Overridable ReadOnly Property SelectedDataKey As DataKey屬性值
ListView 控制項中所選取項目的資料索引鍵。 預設為 null，表示目前未選取項目。
- 屬性
例外狀況
DataKeyNames 屬性中未指定任何資料索引鍵。
範例
下列範例示範如何在主要/詳細資料案例中使用第二個索引鍵欄位作為參數。 控制項 ListView 可用來顯示 AdventureWorks 資料庫的 Product Inventory 資料表中的記錄。 在控制項中 ListView 選取專案時，產品的詳細資料會顯示在另一個 ListView 控制項中。 ProductID 是第一個控制項中的第二個 ListView 索引鍵名稱。 若要存取第二個索引鍵，程式碼會使用 Visual Basic) 中的 (ProductInventoryListView.SelectedDataKey(1) 值 ProductInventoryListView.SelectedDataKey[1] 做為 PropertyName ControlParameter 物件的 。 這個參數物件會由 SqlDataSource 第二 ListView 個控制項系結的控制項使用。
<%@ 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">
protected void ProductInventoryListView_PagePropertiesChanging(object sender,
PagePropertiesChangingEventArgs e)
{
ProductInventoryListView.SelectedIndex = -1;
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>ListView SelectedDataKey Example</title>
<style type="text/css">
.header
{
border: 1px solid #008080;
background-color: #008080;
color: White;
}
.item td { border: 1px solid #008080; }
</style>
</head>
<body>
<form id="form1" runat="server">
<h3>ListView SelectedDataKey Example</h3>
<asp:ListView runat="server"
ID="ProductInventoryListView"
DataSourceID="ProductInventoryDataSource"
DataKeyNames="LocationID,ProductID"
OnPagePropertiesChanging="ProductInventoryListView_PagePropertiesChanging">
<LayoutTemplate>
<b>Product Inventory</b>
<br />
<table width="400px" runat="server" id="tblProducts">
<tr class="header" runat="server">
<th runat="server"> </th>
<th runat="server">Product ID</th>
<th runat="server">Location ID</th>
<th runat="server">Shelf</th>
<th runat="server">Bin</th>
<th runat="server">Quantity</th>
</tr>
<tr runat="server" id="itemPlaceholder" />
</table>
<asp:DataPager runat="server" ID="ProductInventoryPager">
<Fields>
<asp:NextPreviousPagerField ShowFirstPageButton="true"
ShowLastPageButton="true" />
</Fields>
</asp:DataPager>
</LayoutTemplate>
<ItemTemplate>
<tr class="item" runat="server">
<td>
<asp:ImageButton runat="server"
ID="SelectButton"
Width="15"
Height="15"
ImageUrl="~/images/select.jpg"
CommandName="Select" />
</td>
<td>
<asp:Label runat="server" ID="ProductIDLabel" Text='<%#Eval("ProductID") %>' />
</td>
<td>
<asp:Label runat="server" ID="LocationIDLabel" Text='<%#Eval("LocationID") %>' />
</td>
<td>
<asp:Label runat="server" ID="ShelfLabel" Text='<%#Eval("Shelf") %>' />
</td>
<td>
<asp:Label runat="server" ID="BinLabel" Text='<%#Eval("Bin") %>' />
</td>
<td>
<asp:Label runat="server" ID="QuantityLabel" Text='<%#Eval("Quantity") %>' />
</td>
</tr>
</ItemTemplate>
</asp:ListView>
<br /><br />
<asp:ListView runat="server" ID="ProductListView"
DataSourceID="ProductDataSource">
<LayoutTemplate>
<b>Product Details</b>
<table runat="server" id="tblDetails">
<tr runat="server" id="itemPlaceholder" />
</table>
</LayoutTemplate>
<ItemTemplate>
<tr runat="server">
<td class="header">Product ID:</td>
<td>
<asp:Label runat="server" ID="ProductLabel" Text='<%#Eval("ProductID") %>' />
</td>
</tr>
<tr runat="server">
<td class="header">Name:</td>
<td>
<asp:Label runat="server" ID="NameLabel" Text='<%#Eval("Name") %>' />
</td>
</tr>
<tr runat="server">
<td class="header">Color:</td>
<td>
<asp:Label runat="server" ID="ColorLabel" Text='<%#Eval("Color") %>' />
</td>
</tr>
<tr runat="server">
<td class="header">Price:</td>
<td>
<asp:Label runat="server" ID="ListPriceLabel" Text='<%#Eval("ListPrice", "{0:c}") %>' />
</td>
</tr>
</ItemTemplate>
</asp:ListView>
<!-- 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="ProductInventoryDataSource" runat="server"
ConnectionString="<%$ ConnectionStrings:AdventureWorks_DataConnectionString %>"
SelectCommand="SELECT [ProductID], [LocationID], [Shelf], [Bin], [Quantity]
FROM Production.ProductInventory">
</asp:SqlDataSource>
<asp:SqlDataSource ID="ProductDataSource" runat="server"
ConnectionString="<%$ ConnectionStrings:AdventureWorks_DataConnectionString %>"
SelectCommand="SELECT [ProductID], [Name], [Color], [ListPrice], [ProductNumber]
FROM Production.Product
WHERE ProductID = @ProductID
ORDER BY [Name]">
<SelectParameters>
<asp:ControlParameter Name="ProductID"
DefaultValue="0"
ControlID="ProductInventoryListView"
PropertyName="SelectedDataKey[1]" />
</SelectParameters>
</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">
Protected Sub ProductInventoryListView_PagePropertiesChanging(ByVal sender As Object, _
ByVal e As PagePropertiesChangingEventArgs)
ProductInventoryListView.SelectedIndex = -1
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>ListView SelectedDataKey Example</title>
<style type="text/css">
.header
{
border: 1px solid #008080;
background-color: #008080;
color: White;
}
.item td { border: 1px solid #008080; }
</style>
</head>
<body>
<form id="form1" runat="server">
<h3>ListView SelectedDataKey Example</h3>
<asp:ListView runat="server"
ID="ProductInventoryListView"
DataSourceID="ProductInventoryDataSource"
DataKeyNames="LocationID,ProductID"
OnPagePropertiesChanging="ProductInventoryListView_PagePropertiesChanging">
<LayoutTemplate>
<b>Product Inventory</b>
<br />
<table width="400px" runat="server" id="tblProducts">
<tr class="header" runat="server">
<th runat="server"> </th>
<th runat="server">Product ID</th>
<th runat="server">Location ID</th>
<th runat="server">Shelf</th>
<th runat="server">Bin</th>
<th runat="server">Quantity</th>
</tr>
<tr runat="server" id="itemPlaceholder" />
</table>
<asp:DataPager runat="server" ID="ProductInventoryPager">
<Fields>
<asp:NextPreviousPagerField ShowFirstPageButton="true"
ShowLastPageButton="true" />
</Fields>
</asp:DataPager>
</LayoutTemplate>
<ItemTemplate>
<tr class="item" runat="server">
<td>
<asp:ImageButton runat="server"
ID="SelectButton"
Width="15"
Height="15"
ImageUrl="~/images/select.jpg"
CommandName="Select" />
</td>
<td>
<asp:Label runat="server" ID="ProductIDLabel" Text='<%#Eval("ProductID") %>' />
</td>
<td>
<asp:Label runat="server" ID="LocationIDLabel" Text='<%#Eval("LocationID") %>' />
</td>
<td>
<asp:Label runat="server" ID="ShelfLabel" Text='<%#Eval("Shelf") %>' />
</td>
<td>
<asp:Label runat="server" ID="BinLabel" Text='<%#Eval("Bin") %>' />
</td>
<td>
<asp:Label runat="server" ID="QuantityLabel" Text='<%#Eval("Quantity") %>' />
</td>
</tr>
</ItemTemplate>
</asp:ListView>
<br /><br />
<asp:ListView runat="server" ID="ProductListView"
DataSourceID="ProductDataSource">
<LayoutTemplate>
<b>Product Details</b>
<table runat="server" id="tblDetails">
<tr runat="server" id="itemPlaceholder" />
</table>
</LayoutTemplate>
<ItemTemplate>
<tr runat="server">
<td class="header">Product ID:</td>
<td>
<asp:Label runat="server" ID="ProductLabel" Text='<%#Eval("ProductID") %>' />
</td>
</tr>
<tr runat="server">
<td class="header">Name:</td>
<td>
<asp:Label runat="server" ID="NameLabel" Text='<%#Eval("Name") %>' />
</td>
</tr>
<tr runat="server">
<td class="header">Color:</td>
<td>
<asp:Label runat="server" ID="ColorLabel" Text='<%#Eval("Color") %>' />
</td>
</tr>
<tr runat="server">
<td class="header">Price:</td>
<td>
<asp:Label runat="server" ID="ListPriceLabel" Text='<%#Eval("ListPrice", "{0:c}") %>' />
</td>
</tr>
</ItemTemplate>
</asp:ListView>
<!-- 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="ProductInventoryDataSource" runat="server"
ConnectionString="<%$ ConnectionStrings:AdventureWorks_DataConnectionString %>"
SelectCommand="SELECT [ProductID], [LocationID], [Shelf], [Bin], [Quantity]
FROM Production.ProductInventory">
</asp:SqlDataSource>
<asp:SqlDataSource ID="ProductDataSource" runat="server"
ConnectionString="<%$ ConnectionStrings:AdventureWorks_DataConnectionString %>"
SelectCommand="SELECT [ProductID], [Name], [Color], [ListPrice], [ProductNumber]
FROM Production.Product
WHERE ProductID = @ProductID
ORDER BY [Name]">
<SelectParameters>
<asp:ControlParameter Name="ProductID"
DefaultValue="0"
ControlID="ProductInventoryListView"
PropertyName="SelectedDataKey[1]" />
</SelectParameters>
</asp:SqlDataSource>
</form>
</body>
</html>
備註
DataKeyNames設定 屬性時， ListView 控制項會使用指定欄位或欄位的值，為控制項中的每個專案建立 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 控制項中特定資料項目的物件 ListView 。 不過，如果您想要只 DataKey 擷取目前選取專案的 物件，您可以使用 SelectedDataKey 屬性做為快捷方式。
SelectedDataKey使用 屬性與從 集合中擷 DataKeys 取 DataKey 屬性所 SelectedIndex 指定索引處的物件相同。 您也可以使用 SelectedValue 屬性，直接擷取目前選取專案的資料索引鍵值。
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 物件的 屬性 ControlParameter 中的 PropertyName 索引 SelectedDataKey 屬性。