TreeView.ShowRootLines Eigenschaft

Definition

Namespace:

System.Windows.Forms

Assembly:

System.Windows.Forms.dll

Ruft einen Wert ab, der angibt, ob im Strukturansicht-Steuerelement Linien zwischen Stammknoten der Strukturansicht gezeichnet werden, oder legt diesen fest.

public:
 property bool ShowRootLines { bool get(); void set(bool value); };

public bool ShowRootLines { get; set; }

member this.ShowRootLines : bool with get, set

Public Property ShowRootLines As Boolean

Eigenschaftswert

Boolean

true, wenn Linien zwischen Stammknoten der Strukturansicht gezeichnet werden, andernfalls false. Der Standardwert ist true.

Beispiele

Im folgenden Codebeispiel wird veranschaulicht, wie Sie die Enumeration und die BorderStyle BorderStyleShowLinesEigenschaften , HideSelection Scrollable, und ShowRootLines Eigenschaften verwenden. Fügen Sie zum Ausführen dieses Beispiels den folgenden Code in ein Formular ein, und rufen Sie die Methode im Konstruktor oder Load der InitializeTreeView Methode des Formulars auf.

   // Declare the TreeView control.
internal:
   System::Windows::Forms::TreeView^ TreeView1;

private:
   // Initialize the TreeView to blend with the form, giving it the 
   // same color as the form and no border.
   void InitializeTreeView()
   {
      // Create a new TreeView control and set the location and size.
      this->TreeView1 = gcnew System::Windows::Forms::TreeView;
      this->TreeView1->Location = System::Drawing::Point( 72, 48 );
      this->TreeView1->Size = System::Drawing::Size( 200, 200 );

      // Set the BorderStyle property to none, the BackColor property to  
      // the form's backcolor, and the Scrollable property to false.  
      // This allows the TreeView to blend in form.
      this->TreeView1->BorderStyle = BorderStyle::None;
      this->TreeView1->BackColor = this->BackColor;
      this->TreeView1->Scrollable = false;

      // Set the HideSelection property to false to keep the 
      // selection highlighted when the user leaves the control. 
      // This helps it blend with form.
      this->TreeView1->HideSelection = false;

      // Set the ShowRootLines and ShowLines properties to false to 
      // give the TreeView a list-like appearance.
      this->TreeView1->ShowRootLines = false;
      this->TreeView1->ShowLines = false;

      // Add the nodes.
      array<TreeNode^>^temp0 = {gcnew TreeNode( "Full Color" ),gcnew TreeNode( "Project Wizards" ),gcnew TreeNode( "Visual C# and Visual Basic Support" )};
      array<TreeNode^>^temp1 = {gcnew TreeNode( "Pentium 133 MHz or faster processor " ),gcnew TreeNode( "Windows 98 or later" ),gcnew TreeNode( "100 MB Disk space" )};
      array<TreeNode^>^temp2 = {gcnew TreeNode( "Features",temp0 ),gcnew TreeNode( "System Requirements",temp1 )};
      this->TreeView1->Nodes->AddRange( temp2 );

      // Set the tab index and add the TreeView to the form.
      this->TreeView1->TabIndex = 0;
      this->Controls->Add( this->TreeView1 );
   }

// Declare the TreeView control.
internal System.Windows.Forms.TreeView TreeView1;

// Initialize the TreeView to blend with the form, giving it the 
// same color as the form and no border.
private void InitializeTreeView()
{

    // Create a new TreeView control and set the location and size.
    this.TreeView1 = new System.Windows.Forms.TreeView();
    this.TreeView1.Location = new System.Drawing.Point(72, 48);
    this.TreeView1.Size = new System.Drawing.Size(200, 200);

    // Set the BorderStyle property to none, the BackColor property to  
    // the form's backcolor, and the Scrollable property to false.  
    // This allows the TreeView to blend in form.

    this.TreeView1.BorderStyle = BorderStyle.None;
    this.TreeView1.BackColor = this.BackColor;
    this.TreeView1.Scrollable = false;

    // Set the HideSelection property to false to keep the 
    // selection highlighted when the user leaves the control. 
    // This helps it blend with form.
    this.TreeView1.HideSelection = false;

    // Set the ShowRootLines and ShowLines properties to false to 
    // give the TreeView a list-like appearance.
    this.TreeView1.ShowRootLines = false;
    this.TreeView1.ShowLines = false;

    // Add the nodes.
    this.TreeView1.Nodes.AddRange(new TreeNode[]
        {new TreeNode("Features", 
            new TreeNode[]{
            new TreeNode("Full Color"), 
            new TreeNode("Project Wizards"), 
            new TreeNode("Visual C# and Visual Basic Support")}), 
            new TreeNode("System Requirements", 
            new TreeNode[]{
                new TreeNode("Pentium 133 MHz or faster processor "),
                new TreeNode("Windows 98 or later"), 
                new TreeNode("100 MB Disk space")})
        });

    // Set the tab index and add the TreeView to the form.
    this.TreeView1.TabIndex = 0;
    this.Controls.Add(this.TreeView1);
}

' Declare the TreeView control.
Friend WithEvents TreeView1 As System.Windows.Forms.TreeView

' Initialize the TreeView to blend with the form, giving it the 
' same color as the form and no border.
Private Sub InitializeTreeView()

    ' Create a new TreeView control and set the location and size.
    Me.TreeView1 = New System.Windows.Forms.TreeView
    Me.TreeView1.Location = New System.Drawing.Point(72, 48)
    Me.TreeView1.Size = New System.Drawing.Size(200, 200)

    ' Set the BorderStyle property to none, the BackColor property to  
    ' the form's backcolor, and the Scrollable property to false.  
    ' This allows the TreeView to blend in form.
    Me.TreeView1.BorderStyle = BorderStyle.None
    Me.TreeView1.BackColor = Me.BackColor
    Me.TreeView1.Scrollable = False

    
    ' Set the ShowRootLines and ShowLines properties to false to 
    ' give the TreeView a list-like appearance.
    Me.TreeView1.ShowRootLines = False
    Me.TreeView1.ShowLines = False

    ' Add the nodes.
    Me.TreeView1.Nodes.AddRange(New System.Windows.Forms.TreeNode() _
        {New System.Windows.Forms.TreeNode("Features", _
        New System.Windows.Forms.TreeNode() _
        {New System.Windows.Forms.TreeNode("Full Color"), _
        New System.Windows.Forms.TreeNode("Project Wizards"), _
        New System.Windows.Forms.TreeNode("Visual C# and Visual Basic Support")}), _
        New System.Windows.Forms.TreeNode("System Requirements", _
        New System.Windows.Forms.TreeNode() _
        {New System.Windows.Forms.TreeNode _
        ("Pentium 133 MHz or faster processor "), _
        New System.Windows.Forms.TreeNode("Windows 98 or later"), _
        New System.Windows.Forms.TreeNode("100 MB Disk space")})})

    ' Set the tab index and add the TreeView to the form.
    Me.TreeView1.TabIndex = 0
    Me.Controls.Add(Me.TreeView1)
End Sub

Hinweise

Wenn die ShowRootLines Eigenschaft lautet false, werden die Schaltflächen Pluszeichen und Minuszeichen nicht neben den Stammstrukturknoten angezeigt, und die ShowPlusMinus Eigenschaft hat keine Auswirkung.

Siehe auch

• ShowPlusMinus