TreeNode.Select Metodo

Definizione

Seleziona il nodo corrente nel controllo TreeView.Selects the current node in the TreeView control.

public:
 void Select();
public void Select ();
member this.Select : unit -> unit
Public Sub Select ()

Esempio

Nell'esempio di codice riportato di seguito viene illustrato come utilizzare il metodo Select per selezionare un nodo nel controllo TreeView.The following code example demonstrates how to use the Select method to select a node in the TreeView control.


<%@ 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_Command(Object sender, CommandEventArgs e)
  {

    // Iterate through the child nodes of the root node and find
    // the nodes for Chapter One and Chapter Two.
    foreach(TreeNode node in LinksTreeView.Nodes[0].ChildNodes)
    {

      // Select the appropriate node based on which button was clicked.
      switch(node.Text)
      {

        case "Chapter One":
          // If the button clicked was "Chapter One", select the node 
          // using the Selected property.
          if (e.CommandName == "Chapter One")
          {
            // Select the node using the Selected property.
            node.Selected = true;
          }
          break;

        case "Chapter Two":
          // If the button clicked was "Chapter Two", select the node 
          // using the Select method.
          if (e.CommandName == "Chapter Two")
          {
            // Select the node using the Select method.
            node.Select();
          }
          break;

        default:
          // Do nothing.
          break;

      }

    }

  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>TreeNode Selected and Select() Example</title>
</head>
<body>
    <form id="form1" runat="server">
    
      <h3>TreeNode Selected and Select() Example</h3>
    
      <asp:TreeView id="LinksTreeView"
        Font-Names= "Arial"
        ForeColor="Blue"
        SelectedNodeStyle-BackColor="Yellow" 
        ExpandDepth="2"
        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"
              Selected="True">
            
              <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:Button id="SelectChapterOneButton"
        Text="Select Chapter One"
        CommandName="Chapter One" 
        OnCommand="Button_Command"
        runat="server"/>
        
      &nbsp;&nbsp;
        
      <asp:Button id="SelectChapterTwoButton"
        Text="Select Chapter Two"
        CommandName="Chapter Two" 
        OnCommand="Button_Command"
        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_Command(ByVal sender As Object, ByVal e As CommandEventArgs)

    ' Iterate through the child nodes of the root node and find
    ' the nodes for Chapter One and Chapter Two.
    Dim node As TreeNode

    For Each node In LinksTreeView.Nodes(0).ChildNodes

      ' Select the appropriate node based on which button was clicked.
      Select Case node.Text

        Case "Chapter One"
          ' If the button clicked was "Chapter One", select the node 
          ' using the Selected property.
          If e.CommandName = "Chapter One" Then

            ' Select the node using the Selected property.
            node.Selected = True

          End If

        Case "Chapter Two"
          ' If the button clicked was "Chapter Two", select the node 
          ' using the Selected method.
          If e.CommandName = "Chapter Two" Then

            ' Select the node using the Select method.
            node.Select()

          End If

        Case Else
          ' Do nothing.

      End Select

    Next

  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>TreeNode Selected and Select() Example</title>
</head>
<body>
    <form id="form1" runat="server">
    
      <h3>TreeNode Selected and Select() Example</h3>
    
      <asp:TreeView id="LinksTreeView"
        Font-Names= "Arial"
        ForeColor="Blue"
        SelectedNodeStyle-BackColor="Yellow" 
        ExpandDepth="2"
        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"
              Selected="True">
            
              <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:Button id="SelectChapterOneButton"
        Text="Select Chapter One"
        CommandName="Chapter One" 
        OnCommand="Button_Command"
        runat="server"/>
        
      &nbsp;&nbsp;
        
      <asp:Button id="SelectChapterTwoButton"
        Text="Select Chapter Two"
        CommandName="Chapter Two" 
        OnCommand="Button_Command"
        runat="server"/>   

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

Commenti

Usare il metodo Select per selezionare il nodo corrente nel controllo TreeView.Use the Select method to select the current node in the TreeView control.

Nota In alternativa, è anche possibile selezionare il nodo corrente impostando la proprietà Selected su true.Note As an alternative, you can also select the current node by setting the Selected property to true.

Si applica a

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