TreeNode.Parent Property

Definition

Ruft den übergeordneten Knoten des aktuellen Knotens ab.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; }
member this.Parent : System.Web.UI.WebControls.TreeNode
Public ReadOnly Property Parent As TreeNode

Property Value

TreeNode

Ein TreeNode, der den übergeordneten Knoten des aktuellen Knotens darstellt.A TreeNode that represents the parent node of the current node.

Attributes

Examples

Im folgenden Codebeispiel wird veranschaulicht, wie Sie mit der Parent-Eigenschaft auf die Text-Eigenschaft des übergeordneten Knotens des aktuellen Knotens zugreifen.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>

Remarks

Die Parent-Eigenschaft gibt ein TreeNode-Objekt zurück, das den übergeordneten Knoten des aktuellen Knotens darstellt.The Parent property returns a TreeNode object that represents the parent node of the current node. Sie wird häufig verwendet, um den übergeordneten Knoten zu ermitteln oder auf die Eigenschaften des übergeordneten Knotens zuzugreifen.It is commonly used to determine the parent node or to access the properties of the parent node.

Note

Ein Stamm Knoten weist keinen übergeordneten Knoten auf.A root node does not have a parent node.

Um auf die untergeordneten Knoten des aktuellen Knotens zuzugreifen, verwenden Sie die ChildNodes-Eigenschaft.To access the child nodes of the current node, use the ChildNodes property.

Applies to

See also