TreeNodeBinding コンストラクタとは何？わかりやすく解説 Weblio辞書

<%@ Page Language="VB" %>

<script runat="server">

  Sub Page_Load(ByVal sender As
 Object, ByVal e As EventArgs)

    ' Create a new TreeView control.
    Dim NewTree As New TreeView

    ' Set the properties of the TreeView control.
    NewTree.ID = "BookTreeView"
    NewTree.DataSourceID = "BookXmlDataSource"

    ' Create the tree node binding relationship.

    ' Create the root node binding.
    Dim RootBinding As New
 TreeNodeBinding
    RootBinding.DataMember = "Book"
    RootBinding.TextField = "Title"

    ' Create the parent node binding.
    Dim ParentBinding As New
 TreeNodeBinding
    ParentBinding.DataMember = "Chapter"
    ParentBinding.TextField = "Heading"

    ' Create the leaf node binding.
    Dim LeafBinding As New
 TreeNodeBinding
    LeafBinding.DataMember = "Section"
    LeafBinding.TextField = "Heading"

    ' Add bindings to the DataBindings collection.
    NewTree.DataBindings.Add(RootBinding)
    NewTree.DataBindings.Add(ParentBinding)
    NewTree.DataBindings.Add(LeafBinding)

    ' Manually register the event handler for the SelectedNodeChanged
 event.
    AddHandler NewTree.SelectedNodeChanged, AddressOf
 Node_Change

    ' Add the TreeView control to the Controls collection of the PlaceHolder
 control.
    ControlPlaceHolder.Controls.Add(NewTree)

  End Sub

  Sub Node_Change(ByVal sender As
 Object, ByVal e As EventArgs)

    ' Retrieve the TreeView control from the Controls collection of
 the PlaceHolder control.
    Dim LocalTree As TreeView = CType(ControlPlaceHolder.FindControl("BookTreeView"),
 TreeView)

    ' Display the selected node.
    Message.Text = "You selected: " & LocalTree.SelectedNode.Text

  End Sub

</script>

<html>
  <body>
    <form runat="server">
    
      <h3>TreeView Constructor Example</h3>
      
      <asp:PlaceHolder id="ControlPlaceHolder"
 runat="server">
      </asp:PlaceHolder>
   
      <asp:XmlDataSource id="BookXmlDataSource"
  
        DataFile="Book.xml"
        runat="server">
      </asp:XmlDataSource>
      
      <br><br>
      
      <asp:Label id="Message" runat="server"/>
    
    </form>
  </body>
</html>

<%@ Page Language="C#" %>

<script runat="server">

  void Page_Load(Object sender, EventArgs e)
  {

    // Create a new TreeView control.
    TreeView NewTree = new TreeView();

    // Set the properties of the TreeView control.
    NewTree.ID = "BookTreeView";
    NewTree.DataSourceID = "BookXmlDataSource";

    // Create the tree node binding relationship.

    // Create the root node binding.
    TreeNodeBinding RootBinding = new TreeNodeBinding();
    RootBinding.DataMember = "Book";
    RootBinding.TextField = "Title";

    // Create the parent node binding.
    TreeNodeBinding ParentBinding = new TreeNodeBinding();
    ParentBinding.DataMember = "Chapter";
    ParentBinding.TextField = "Heading";

    // Create the leaf node binding.
    TreeNodeBinding LeafBinding = new TreeNodeBinding();
    LeafBinding.DataMember = "Section";
    LeafBinding.TextField = "Heading";

    // Add bindings to the DataBindings collection.
    NewTree.DataBindings.Add(RootBinding);
    NewTree.DataBindings.Add(ParentBinding); 
    NewTree.DataBindings.Add(LeafBinding);

    // Manually register the event handler for the SelectedNodeChanged
 event.
    NewTree.SelectedNodeChanged += new EventHandler(this.Node_Change);

    // Add the TreeView control to the Controls collection of the PlaceHolder
 control.
    ControlPlaceHolder.Controls.Add(NewTree);

  }

  void Node_Change(Object sender, EventArgs e)
  {

    // Retrieve the TreeView control from the Controls collection of
 the PlaceHolder control.
    TreeView LocalTree = (TreeView)ControlPlaceHolder.FindControl("BookTreeView");

    // Display the selected node.
    Message.Text = "You selected: " + LocalTree.SelectedNode.Text;

  }

</script>

<html>
  <body>
    <form runat="server">
    
      <h3>TreeView Constructor Example</h3>
      
      <asp:PlaceHolder id="ControlPlaceHolder" runat="server">
      </asp:PlaceHolder>
   
      <asp:XmlDataSource id="BookXmlDataSource"  
        DataFile="Book.xml"
        runat="server">
      </asp:XmlDataSource>
      
      <br><br>
      
      <asp:Label id="Message" runat="server"/>
    
    </form>
  </body>
</html>