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TreeNodeCollection.CopyTo(TreeNode[], Int32) Methode

Definition

Kopiert alle Elemente aus dem TreeNodeCollection-Objekt in ein kompatibles eindimensionales Array von TreeNode-Objekten, wobei am angegebenen Index des Zielarrays begonnen wird.

public:
 void CopyTo(cli::array <System::Web::UI::WebControls::TreeNode ^> ^ nodeArray, int index);
public void CopyTo (System.Web.UI.WebControls.TreeNode[] nodeArray, int index);
member this.CopyTo : System.Web.UI.WebControls.TreeNode[] * int -> unit
Public Sub CopyTo (nodeArray As TreeNode(), index As Integer)

Parameter

nodeArray
TreeNode[]

Ein nullbasiertes Array von TreeNode-Objekten, das die kopierten Elemente aus der TreeNodeCollection aufnimmt.

index
Int32

Die Position im Zielarray, bei der mit dem Empfang des kopierten Inhalts begonnen werden soll.

Beispiele

Im folgenden Beispiel wird veranschaulicht, wie die CopyTo -Methode verwendet wird, um die Werte eines TreeNodeCollection in ein Array zu kopieren. Beachten Sie, dass die Nodes -Eigenschaft ein TreeNodeCollection -Objekt zurückgibt.


<%@ 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)
  {

    // If the TreeView control contains any root nodes, display the 
    // text value of each node. 
    if (LinksTreeView.Nodes.Count > 0)
    {

      // Declare an array of TreeNode objects.
      TreeNode[] RootNodeArray = new TreeNode[LinksTreeView.Nodes.Count];

      // Use the CopyTo method to copy the root nodes into the array.
      LinksTreeView.Nodes.CopyTo(RootNodeArray, 0);

      // Display the root nodes.
      foreach (TreeNode node in RootNodeArray)
      {

        Message.Text += node.Text + "<br />";

      }

    }
    else
    {

      Message.Text = "The TreeView control does not have any nodes.";

    }

  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>TreeNodeCollection CopyTo Example</title>
</head>
<body>
    <form id="form1" runat="server">
    
      <h3>TreeNodeCollection CopyTo Example</h3>
    
      <asp:TreeView id="LinksTreeView"
        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"
            Expanded="true">
             
            <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="Subtopic 1"/>
                  <asp:TreeNode Text="Subtopic 2"/>
                
                </asp:TreeNode>
                <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 Page_Load(ByVal sender As Object, ByVal e As EventArgs)

    ' If the TreeView control contains any root nodes, display the 
    ' text value of each node. 
    If LinksTreeView.Nodes.Count > 0 Then

      ' Declare an array of TreeNode objects.
      Dim RootNodeArray(LinksTreeView.Nodes.Count - 1) As TreeNode

      ' Use the CopyTo method to copy the root nodes into the array.
      LinksTreeView.Nodes.CopyTo(RootNodeArray, 0)

      ' Display the root nodes.
      Dim node As TreeNode

      For Each node In RootNodeArray

        Message.Text &= node.Text & "<br />"

      Next node

    Else

      Message.Text = "The TreeView control does not have any nodes."

    End If

  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>TreeNodeCollection CopyTo Example</title>
</head>
<body>
    <form id="form1" runat="server">
    
      <h3>TreeNodeCollection CopyTo Example</h3>
    
      <asp:TreeView id="LinksTreeView"
        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"
            Expanded="true">
             
            <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="Subtopic 1"/>
                  <asp:TreeNode Text="Subtopic 2"/>
                
                </asp:TreeNode>
                <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>

Hinweise

Verwenden Sie die CopyTo -Methode, um den Inhalt von TreeNodeCollection in das angegebene nullbasierte System.Array Objekt zu kopieren. Elemente werden ab dem angegebenen Index des Zielarrays kopiert. Mit dem System.Array -Objekt können Sie dann die Arraysyntax verwenden, um auf die Elemente im TreeNodeCollectionzuzugreifen.

Alternativ können Sie die GetEnumerator -Methode auch verwenden, um einen Enumerator zu erstellen, der für den Zugriff auf die Elemente in der Auflistung verwendet werden kann.

Gilt für:

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