GridView.DataKeys 属性
定义
重要
一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。 对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。
public:
virtual property System::Web::UI::WebControls::DataKeyArray ^ DataKeys { System::Web::UI::WebControls::DataKeyArray ^ get(); };[System.ComponentModel.Browsable(false)]
public virtual System.Web.UI.WebControls.DataKeyArray DataKeys { get; }[<System.ComponentModel.Browsable(false)>]
member this.DataKeys : System.Web.UI.WebControls.DataKeyArrayPublic Overridable ReadOnly Property DataKeys As DataKeyArray属性值
一个 DataKeyArray，其中包含 GridView 控件中每一行的数据键。
- 属性
示例
下面的示例演示如何使用 DataKeys 属性来确定控件中 GridView 所选行的数据键值。
<%@ 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)
{
// Determine the index of the selected row.
int index = CustomersGridView.SelectedIndex;
// Display the primary key value of the selected row.
Message.Text = "The primary key value of the selected row is " +
CustomersGridView.DataKeys[index].Value.ToString() + ".";
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridView DataKeys Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridView DataKeys Example</h3>
<asp:label id="Message"
forecolor="Red"
runat="server"/>
<br/><br/>
<asp:gridview id="CustomersGridView"
datasourceid="CustomersSource"
autogeneratecolumns="true"
emptydatatext="No data available."
autogenerateselectbutton="true"
datakeynames="CustomerID"
onselectedindexchanged="CustomersGridView_SelectedIndexChanged"
runat="server">
</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)
' Determine the index of the selected row.
Dim index As Integer = CustomersGridView.SelectedIndex
' Display the primary key value of the selected row.
Message.Text = "The primary key value of the selected row is " & _
CustomersGridView.DataKeys(index).Value.ToString() & "."
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridView DataKeys Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridView DataKeys Example</h3>
<asp:label id="Message"
forecolor="Red"
runat="server"/>
<br/><br/>
<asp:gridview id="CustomersGridView"
datasourceid="CustomersSource"
autogeneratecolumns="true"
emptydatatext="No data available."
autogenerateselectbutton="true"
datakeynames="CustomerID"
onselectedindexchanged="CustomersGridView_SelectedIndexChanged"
runat="server">
</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>
注解
DataKeyNames设置属性后，控件GridView会自动为控件中的每个行创建一个DataKey对象。 该 DataKey 对象包含属性中指定的 DataKeyNames 字段或字段的值。 DataKey然后将对象添加到控件的DataKeys集合中。 DataKeys使用属性检索DataKey控件中GridView特定数据行的对象。
备注
可以使用该 SelectedDataKey 属性检索 DataKey 当前所选行的对象。 还可以使用 SelectedValue 该属性直接检索当前所选行的数据键值。