TreeNode.Parent 属性
定义
获取当前节点的父节点。Gets the parent node of the current node.
public:
property System::Web::UI::WebControls::TreeNode ^ Parent { System::Web::UI::WebControls::TreeNode ^ get(); };
[System.ComponentModel.Browsable(false)]
public System.Web.UI.WebControls.TreeNode Parent { get; }
[<System.ComponentModel.Browsable(false)>]
member this.Parent : System.Web.UI.WebControls.TreeNode
Public ReadOnly Property Parent As TreeNode
属性值
TreeNode,表示当前节点的父节点。A TreeNode that represents the parent node of the current node.
- 属性
示例
下面的代码示例演示如何使用 Parent 属性访问 Text 当前节点的父节点的属性。The following code example demonstrates how to use the Parent property to access the Text property of the current node's parent node.
<%@ 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 Selection_Changed(Object sender, EventArgs e)
{
// Display the selected node and its parent node.
Message.Text = "You selected " + LinksTreeView.SelectedNode.Text + ". ";
if(LinksTreeView.SelectedNode.Parent.Depth != -1)
{
Message.Text += "Its parent node is " + LinksTreeView.SelectedNode.Parent.Text + ".";
}
else
{
Message.Text += "This is a root node and does not have a parent node.";
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>TreeNode Parent Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>TreeNode Parent Example</h3>
<h5>Select a node from the TreeView control.</h5>
<asp:TreeView id="LinksTreeView"
Font-Names= "Arial"
ForeColor="Blue"
ExpandDepth="2"
OnSelectedNodeChanged="Selection_Changed"
runat="server">
<LevelStyles>
<asp:TreeNodeStyle ChildNodesPadding="10"
Font-Bold="true"
Font-Size="12pt"
ForeColor="DarkGreen"/>
<asp:TreeNodeStyle ChildNodesPadding="5"
Font-Bold="true"
Font-Size="10pt"/>
<asp:TreeNodeStyle ChildNodesPadding="5"
Font-UnderLine="true"
Font-Size="10pt"/>
<asp:TreeNodeStyle ChildNodesPadding="10"
Font-Size="8pt"/>
</LevelStyles>
<Nodes>
<asp:TreeNode Text="Table of Contents">
<asp:TreeNode Text="Chapter One">
<asp:TreeNode Text="Section 1.0">
<asp:TreeNode Text="Topic 1.0.1"/>
<asp:TreeNode Text="Topic 1.0.2"/>
<asp:TreeNode Text="Topic 1.0.3"/>
</asp:TreeNode>
<asp:TreeNode Text="Section 1.1">
<asp:TreeNode Text="Topic 1.1.1"/>
<asp:TreeNode Text="Topic 1.1.2"/>
<asp:TreeNode Text="Topic 1.1.3"/>
<asp:TreeNode Text="Topic 1.1.4"/>
</asp:TreeNode>
</asp:TreeNode>
<asp:TreeNode Text="Chapter Two">
<asp:TreeNode Text="Section 2.0">
<asp:TreeNode Text="Topic 2.0.1"/>
<asp:TreeNode Text="Topic 2.0.2"/>
</asp:TreeNode>
</asp:TreeNode>
</asp:TreeNode>
<asp:TreeNode Text="Appendix A" />
<asp:TreeNode Text="Appendix B" />
<asp:TreeNode Text="Appendix C" />
</Nodes>
</asp:TreeView>
<br /><br />
<asp:Label id="Message"
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 Selection_Changed(ByVal sender As Object, ByVal e As EventArgs)
' Display the selected node and its parent node.
Message.Text = "You selected " & LinksTreeView.SelectedNode.Text & ". "
If LinksTreeView.SelectedNode.Parent.Depth <> -1 Then
Message.Text &= "Its parent node is " & LinksTreeView.SelectedNode.Parent.Text & "."
Else
Message.Text &= "This is a root node and does not have a parent node."
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>TreeNode Parent Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>TreeNode Parent Example</h3>
<h5>Select a node from the TreeView control.</h5>
<asp:TreeView id="LinksTreeView"
Font-Names= "Arial"
ForeColor="Blue"
ExpandDepth="2"
OnSelectedNodeChanged="Selection_Changed"
runat="server">
<LevelStyles>
<asp:TreeNodeStyle ChildNodesPadding="10"
Font-Bold="true"
Font-Size="12pt"
ForeColor="DarkGreen"/>
<asp:TreeNodeStyle ChildNodesPadding="5"
Font-Bold="true"
Font-Size="10pt"/>
<asp:TreeNodeStyle ChildNodesPadding="5"
Font-UnderLine="true"
Font-Size="10pt"/>
<asp:TreeNodeStyle ChildNodesPadding="10"
Font-Size="8pt"/>
</LevelStyles>
<Nodes>
<asp:TreeNode Text="Table of Contents">
<asp:TreeNode Text="Chapter One">
<asp:TreeNode Text="Section 1.0">
<asp:TreeNode Text="Topic 1.0.1"/>
<asp:TreeNode Text="Topic 1.0.2"/>
<asp:TreeNode Text="Topic 1.0.3"/>
</asp:TreeNode>
<asp:TreeNode Text="Section 1.1">
<asp:TreeNode Text="Topic 1.1.1"/>
<asp:TreeNode Text="Topic 1.1.2"/>
<asp:TreeNode Text="Topic 1.1.3"/>
<asp:TreeNode Text="Topic 1.1.4"/>
</asp:TreeNode>
</asp:TreeNode>
<asp:TreeNode Text="Chapter Two">
<asp:TreeNode Text="Section 2.0">
<asp:TreeNode Text="Topic 2.0.1"/>
<asp:TreeNode Text="Topic 2.0.2"/>
</asp:TreeNode>
</asp:TreeNode>
</asp:TreeNode>
<asp:TreeNode Text="Appendix A" />
<asp:TreeNode Text="Appendix B" />
<asp:TreeNode Text="Appendix C" />
</Nodes>
</asp:TreeView>
<br /><br />
<asp:Label id="Message"
runat="server"/>
</form>
</body>
</html>
注解
Parent属性返回一个 TreeNode 对象,该对象表示当前节点的父节点。The Parent property returns a TreeNode object that represents the parent node of the current node. 它通常用于确定父节点或访问父节点的属性。It is commonly used to determine the parent node or to access the properties of the parent node.
备注
根节点没有父节点。A root node does not have a parent node.
若要访问当前节点的子节点,请使用 ChildNodes 属性。To access the child nodes of the current node, use the ChildNodes property.