TreeNodeBindingCollection.Item[Int32] 属性
定义
重要
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获取或设置 TreeNodeBinding 对象中指定索引处的 TreeNodeBindingCollection 对象。
public:
property System::Web::UI::WebControls::TreeNodeBinding ^ default[int] { System::Web::UI::WebControls::TreeNodeBinding ^ get(int i); void set(int i, System::Web::UI::WebControls::TreeNodeBinding ^ value); };public System.Web.UI.WebControls.TreeNodeBinding this[int i] { get; set; }member this.Item(int) : System.Web.UI.WebControls.TreeNodeBinding with get, setDefault Public Property Item(i As Integer) As TreeNodeBinding参数
- i
- Int32
要检索的 TreeNodeBinding 的从零开始的索引。
属性值
TreeNodeBinding 中指定索引处的 TreeNodeBindingCollection。
示例
下面的代码示例演示如何使用 Item[] 索引器访问对象中的 TreeNodeBindingCollection 项。 第 TreeNodeBinding 三级节点的对象以编程方式使用新值进行更新。 若要使此示例正常工作，必须将位于本部分末尾的 XML 数据复制到名为“Book.xml”的文件。
<%@ 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 Page_Load(Object sender, EventArgs e)
{
// Use the indexer to access the TreeNodeBinding object for
// the third-level nodes (index 2) and change the value of
// its TextField property to "Subject".
BookTreeView.DataBindings[2].TextField = "Subject";
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>TreeNodeBindingCollection Indexer Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>TreeNodeBindingCollection Indexer Example</h3>
<asp:TreeView id="BookTreeView"
DataSourceID="BookXmlDataSource"
runat="server">
<DataBindings>
<asp:TreeNodeBinding DataMember="Book" TextField="Title"/>
<asp:TreeNodeBinding DataMember="Chapter" TextField="Heading"/>
<asp:TreeNodeBinding DataMember="Section" TextField="Heading"/>
</DataBindings>
</asp:TreeView>
<asp:XmlDataSource id="BookXmlDataSource"
DataFile="Book.xml"
runat="server">
</asp:XmlDataSource>
</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 Page_Load(ByVal sender As Object, ByVal e As EventArgs)
' Use the indexer to access the TreeNodeBinding object for
' the third-level nodes (index 2) and change the value of
' its TextField property to "Subject".
BookTreeView.DataBindings(2).TextField = "Subject"
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>TreeNodeBindingCollection Indexer Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>TreeNodeBindingCollection Indexer Example</h3>
<asp:TreeView id="BookTreeView"
DataSourceID="BookXmlDataSource"
runat="server">
<DataBindings>
<asp:TreeNodeBinding DataMember="Book" TextField="Title"/>
<asp:TreeNodeBinding DataMember="Chapter" TextField="Heading"/>
<asp:TreeNodeBinding DataMember="Section" TextField="Heading"/>
</DataBindings>
</asp:TreeView>
<asp:XmlDataSource id="BookXmlDataSource"
DataFile="Book.xml"
runat="server">
</asp:XmlDataSource>
</form>
</body>
</html>
下面是上述代码示例的 XML 数据。
<Book Title="Book Title">
<Chapter Heading="Chapter 1">
<Section Heading="Section 1"
Subject="Subject 1">
</Section>
<Section Heading="Section 2"
Subject="Subject 1">
</Section>
</Chapter>
<Chapter Heading="Chapter 2">
<Section Heading="Section 1"
Subject="Subject 1">
</Section>
</Chapter>
</Book>
注解
Item[]使用索引器从TreeNodeBindingCollection位于使用数组表示法的对象访问TreeNodeBinding对象i。 索引 Item[] 器允许你直接修改或替换 TreeNodeBinding 集合中的对象。