TreeView.FindNode(String) Méthode

Définition

Récupère l'objet TreeNode dans le contrôle TreeView au niveau du chemin de valeur spécifié.

public:
 System::Web::UI::WebControls::TreeNode ^ FindNode(System::String ^ valuePath);
public System.Web.UI.WebControls.TreeNode FindNode (string valuePath);
member this.FindNode : string -> System.Web.UI.WebControls.TreeNode
Public Function FindNode (valuePath As String) As TreeNode

Paramètres

valuePath
String

Chemin de valeur d'un nœud.

Retours

TreeNode au chemin de valeur spécifié.

Exemples

L’exemple de code suivant montre comment utiliser la FindNode méthode pour récupérer un nœud à partir du TreeView contrôle .

Important

Cet exemple comprend une zone de texte qui accepte une entrée d'utilisateur, ce qui constitue une menace potentielle pour la sécurité. Par défaut, les pages web ASP.NET vérifient que l’entrée d’utilisateur n’inclut pas de script ou d’éléments HTML. Pour plus d’informations, consultez Vue d’ensemble des attaques de script.


<%@ 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 Button_Click(Object sender, EventArgs e)
  {

    // Find the node specified by the user.
    TreeNode node = LinksTreeView.FindNode(Server.HtmlEncode(ValuePathText.Text));

    if (node != null)
    {
      // Indicate that the node was found.
      Message.Text = "The specified node (" + node.ValuePath + ") was found.";
    }
    else
    {
      // Indicate that the node is not in the TreeView control.
      Message.Text = "The specified node (" + ValuePathText.Text + ") is not in this TreeView control.";
    }

  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml">
  <head runat="server">
    <title>TreeView FindNode Example</title>
</head>
<body>
    <form id="form1" runat="server">
    
      <h3>TreeView FindNode Example</h3>
    
      <asp:TreeView id="LinksTreeView"
        PathSeparator="/"
        Font-Names= "Arial"
        ForeColor="Blue" 
        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"
            SelectAction="None">
             
            <asp:TreeNode Text="Chapter One" Value="Chapter One">
            
              <asp:TreeNode Text="Section 1.0" Value="Section 1.0">
              
                <asp:TreeNode Text="Topic 1.0.1" Value="Topic 1.0.1"/>
                <asp:TreeNode Text="Topic 1.0.2" Value="Topic 1.0.2"/>
                <asp:TreeNode Text="Topic 1.0.3" Value="Topic 1.0.3"/>
              
              </asp:TreeNode>
              
              <asp:TreeNode Text="Section 1.1">
              
                <asp:TreeNode Text="Topic 1.1.1" Value="Topic 1.1.1"/>
                <asp:TreeNode Text="Topic 1.1.2" Value="Topic 1.1.2"/>
                <asp:TreeNode Text="Topic 1.1.3" Value="Topic 1.1.3"/>
                <asp:TreeNode Text="Topic 1.1.4" Value="Topic 1.1.4"/>
              
              </asp:TreeNode>
            
            </asp:TreeNode>
            
            <asp:TreeNode Text="Chapter Two" Value="Chapter Two">
            
              <asp:TreeNode Text="Section 2.0" Value="Section 2.0">
              
                <asp:TreeNode Text="Topic 2.0.1" Value="Topic 2.0.1"/>
                <asp:TreeNode Text="Topic 2.0.2" Value="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>
      
      <hr/>
      
      <br/><br/>
      
      Enter the value path of the node to locate. <br/>
      Use a forward slash (/) to delimit each node value.<br/>
      <asp:TextBox id="ValuePathText" 
        Text="Table of Contents/Chapter One/Section 1.0"
        Width="50%" 
        runat="server"/>
         
      <br/><br/>
      
      <asp:Button id="Submit"
        Text="Find Node"
        OnClick="Button_Click"  
        runat="server"/>
      
      <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 Button_Click(ByVal sender As Object, ByVal e As EventArgs)

    ' Find the node specified by the user.
    Dim node As TreeNode = LinksTreeView.FindNode(Server.HtmlEncode(ValuePathText.Text))

    If Not node Is Nothing Then
   
      ' Indicate that the node was found.
      Message.Text = "The specified node (" & node.ValuePath & ") was found."

    Else

      ' Indicate that the node is not in the TreeView control.
      Message.Text = "The specified node (" & ValuePathText.Text & ") is not in this TreeView control."

    End If

  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml">
  <head runat="server">
    <title>TreeView FindNode Example</title>
</head>
<body>
    <form id="form1" runat="server">
    
      <h3>TreeView FindNode Example</h3>
    
      <asp:TreeView id="LinksTreeView"
        PathSeparator="/"
        Font-Names= "Arial"
        ForeColor="Blue" 
        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"
            SelectAction="None">
             
            <asp:TreeNode Text="Chapter One" Value="Chapter One">
            
              <asp:TreeNode Text="Section 1.0" Value="Section 1.0">
              
                <asp:TreeNode Text="Topic 1.0.1" Value="Topic 1.0.1"/>
                <asp:TreeNode Text="Topic 1.0.2" Value="Topic 1.0.2"/>
                <asp:TreeNode Text="Topic 1.0.3" Value="Topic 1.0.3"/>
              
              </asp:TreeNode>
              
              <asp:TreeNode Text="Section 1.1">
              
                <asp:TreeNode Text="Topic 1.1.1" Value="Topic 1.1.1"/>
                <asp:TreeNode Text="Topic 1.1.2" Value="Topic 1.1.2"/>
                <asp:TreeNode Text="Topic 1.1.3" Value="Topic 1.1.3"/>
                <asp:TreeNode Text="Topic 1.1.4" Value="Topic 1.1.4"/>
              
              </asp:TreeNode>
            
            </asp:TreeNode>
            
            <asp:TreeNode Text="Chapter Two" Value="Chapter Two">
            
              <asp:TreeNode Text="Section 2.0" Value="Section 2.0">
              
                <asp:TreeNode Text="Topic 2.0.1" Value="Topic 2.0.1"/>
                <asp:TreeNode Text="Topic 2.0.2" Value="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>
      
      <hr/>
      
      <br/><br/>
      
      Enter the value path of the node to locate. <br/>
      Use a forward slash (/) to delimit each node value.<br/>
      <asp:TextBox id="ValuePathText" 
        Text="Table of Contents/Chapter One/Section 1.0"
        Width="50%" 
        runat="server"/>
         
      <br/><br/>
      
      <asp:Button id="Submit"
        Text="Find Node"
        OnClick="Button_Click"  
        runat="server"/>
      
      <br/><br/>
      
      <asp:Label id="Message" runat="server"/>

    </form>
  </body>
</html>

Remarques

Utilisez la FindNode méthode pour obtenir un nœud du TreeView contrôle au niveau du chemin de valeur spécifié. Le chemin de la valeur contient une liste de valeurs de nœud séparées par un délimiteur qui forment un chemin d’accès du nœud racine au nœud actuel. Chaque nœud stocke son chemin de valeur dans la ValuePath propriété . La PathSeparator propriété spécifie le caractère délimiteur utilisé pour séparer les valeurs de nœud.

S’applique à

Voir aussi