TreeNode.Parent Proprietà
Definizione
Importante
Alcune informazioni sono relative alla release non definitiva del prodotto, che potrebbe subire modifiche significative prima della release definitiva. Microsoft non riconosce alcuna garanzia, espressa o implicita, in merito alle informazioni qui fornite.
Ottiene il nodo padre del nodo corrente.
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.TreeNodePublic ReadOnly Property Parent As TreeNodeValore della proprietà
Oggetto TreeNode che rappresenta il nodo padre del nodo corrente.
- Attributi
Esempio
Nell'esempio di codice seguente viene illustrato come usare la Parent proprietà per accedere alla Text proprietà del nodo padre del nodo corrente.
<%@ 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>
Commenti
La Parent proprietà restituisce un TreeNode oggetto che rappresenta il nodo padre del nodo corrente. Viene comunemente usato per determinare il nodo padre o per accedere alle proprietà del nodo padre.
Nota
Un nodo radice non ha un nodo padre.
Per accedere ai nodi figlio del nodo corrente, usare la ChildNodes proprietà .