Control.NamingContainer 属性
定义
重要
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获取对服务器控件的命名容器的引用，此引用创建唯一的命名空间，以区分具有相同 ID 属性值的服务器控件。
public:
virtual property System::Web::UI::Control ^ NamingContainer { System::Web::UI::Control ^ get(); };[System.ComponentModel.Browsable(false)]
public virtual System.Web.UI.Control NamingContainer { get; }[System.ComponentModel.Browsable(false)]
[System.ComponentModel.Bindable(false)]
public virtual System.Web.UI.Control NamingContainer { get; }[<System.ComponentModel.Browsable(false)>]
member this.NamingContainer : System.Web.UI.Control[<System.ComponentModel.Browsable(false)>]
[<System.ComponentModel.Bindable(false)>]
member this.NamingContainer : System.Web.UI.ControlPublic Overridable ReadOnly Property NamingContainer As Control属性值
服务器控件的命名容器。
- 属性
示例
以下示例演示了如何使用 NamingContainer 该属性。
<% @ Import Namespace = "System.Data" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>
Control NamingContainer Example
</title>
<script language="C#" runat="server">
// Build the DataSource.
ICollection CreateDataSource()
{
DataTable myDataTable = new DataTable();
DataRow myDataRow;
myDataTable.Columns.Add(new DataColumn("EmployeeName", typeof(string)));
for (int i = 0; i < 10; i++)
{
myDataRow = myDataTable.NewRow();
myDataRow[0] = "somename" + i.ToString();
myDataTable.Rows.Add(myDataRow);
}
DataView myDataView = new DataView(myDataTable);
return myDataView;
}
void Page_Load(Object sender, EventArgs e)
{
if (!IsPostBack)
{
// Bind 'DataView' to the DataSource.
myDataList.DataSource = CreateDataSource();
myDataList.DataBind();
}
// Attach EventHandler for SelectedIndexChanged event.
myDataList.SelectedIndexChanged += new EventHandler(selectedItemChanged);
}
// Handler function for 'SelectedIndexChanged' event.
void selectedItemChanged(Object sender,EventArgs e)
{
DataListItem myCurrentItem = myDataList.SelectedItem;
Control myNamingContainer = myCurrentItem.Controls[0].NamingContainer;
// Display the NamingContainer.
myLabel1.Text = "The NamingContainer is : " + myNamingContainer.UniqueID;
// Display the UniqueID.
myLabel2.Text = "The UniqueID is : " + ((Control)(myCurrentItem.Controls[0])).UniqueID;
}
</script>
</head>
<body>
<form runat="server" id="Form1">
<h3>
Control NamingContainer Example
</h3>
<h4>
Click an item to view it's Naming Container and UniqueID
</h4>
<asp:Label ID="myLabel1" Runat="server"></asp:Label>
<br />
<asp:Label ID="myLabel2" Runat="server"></asp:Label>
<br />
<asp:DataList id="myDataList" runat="server" BorderColor="black">
<HeaderStyle BackColor="#aaaadd"></HeaderStyle>
<SelectedItemStyle BackColor="lightgreen"></SelectedItemStyle>
<HeaderTemplate>
EmployeeName
</HeaderTemplate>
<ItemTemplate>
<asp:LinkButton id="button1" Text='<%# DataBinder.Eval(Container.DataItem, "EmployeeName") %>' CommandName="select" runat="server" />
</ItemTemplate>
</asp:DataList>
</form>
</body>
</html>
<%@ Import Namespace = "System.Data" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>
Control NamingContainer Example
</title>
<script language="VB" runat="server">
' Build the DataSource.
Function CreateDataSource() As ICollection
Dim myDataTable As New DataTable()
Dim myDataRow As DataRow
myDataTable.Columns.Add(New DataColumn("EmployeeName", GetType(String)))
Dim i As Integer
For i = 0 To 9
myDataRow = myDataTable.NewRow()
myDataRow(0) = "somename" + i.ToString()
myDataTable.Rows.Add(myDataRow)
Next i
Dim myDataView As New DataView(myDataTable)
Return myDataView
End Function
Sub Page_Load(sender As Object, e As EventArgs)
If Not IsPostBack Then
' Bind 'DataView' to the DataSource.
myDataList.DataSource = CreateDataSource()
myDataList.DataBind()
End If
' Attach EventHandler for SelectedIndexChanged event.
AddHandler myDataList.SelectedIndexChanged, AddressOf selectedItemChanged
End Sub
' Handler function for 'SelectedIndexChanged' event.
Sub selectedItemChanged(sender As Object, e As EventArgs)
Dim myCurrentItem As DataListItem = myDataList.SelectedItem
Dim myNamingContainer As Control = myCurrentItem.Controls(0).NamingContainer
' Display the NamingContainer.
myLabel1.Text = "The NamingContainer is : " + myNamingContainer.UniqueID
' Display the UniqueID.
myLabel2.Text = "The UniqueID is : " + CType(myCurrentItem.Controls(0), Control).UniqueID
End Sub
</script>
</head>
<body>
<form runat="server" id="Form1">
<h3>
Control NamingContainer Example
</h3>
<h4>
Click an item to view it's Naming Container and UniqueID
</h4>
<asp:Label ID="myLabel1" Runat="server"></asp:Label>
<br />
<asp:Label ID="myLabel2" Runat="server"></asp:Label>
<br />
<asp:DataList id="myDataList" runat="server" BorderColor="black">
<HeaderStyle BackColor="#aaaadd"></HeaderStyle>
<SelectedItemStyle BackColor="lightgreen"></SelectedItemStyle>
<HeaderTemplate>
EmployeeName
</HeaderTemplate>
<ItemTemplate>
<asp:LinkButton id="button1" Text='<%# DataBinder.Eval(Container.DataItem, "EmployeeName") %>' CommandName="select" runat="server" />
</ItemTemplate>
</asp:DataList>
</form>
</body>
</html>
注解
ASP.NET Web 应用程序中的每一页都包含控件层次结构。 此层次结构不依赖于控件是否生成对用户可见的 UI。 给定控件的命名容器是实现接口的 INamingContainer 层次结构中其上方的父控件。 实现此接口的服务器控件为其 ID 子服务器控件的属性值创建唯一的命名空间。 可以使用 NamingContainer 命名容器的子控件的属性来获取对其父容器的引用。
将 Web 服务器控件绑定到数据（如 Repeater 服务器控件和 DataList 服务器控件）时，为服务器控件创建唯一命名空间尤其重要。 当数据源中的多个条目创建作为重复控件子级的服务器控件的多个实例时，命名容器可确保这些子控件的每个实例都具有 UniqueID 不冲突的属性值。 页面的默认命名容器是请求该页面时生成的类的实例 Page 。
该 ClientID 属性包含呈现为 HTML 标记中元素 id 属性的值。 根据分配给 ClientIDMode 属性的值，为 ClientID 该属性生成的值可能包括对象的 ID NamingContainer 。 When you set ClientIDMode to Static, the ClientID value does not include the ID of the NamingContainer object. 如果设置为ClientIDMode任一或，AutoIDPredictableClientID该值将包含对象中的 NamingContainer ID。 有关详细信息，请参阅 ASP.NET Web 服务器控件标识。