TreeView.ShowRootLines Property


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Gets or sets a value indicating whether lines are drawn between the tree nodes that are at the root of the tree view.

Namespace:   System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

public bool ShowRootLines { get; set; }

Property Value

Type: System.Boolean

true if lines are drawn between the tree nodes that are at the root of the tree view; otherwise, false. The default is true.

If the ShowRootLines property is false, the plus-sign and minus-sign buttons will not appear next to the root tree nodes, and the ShowPlusMinus property will have no effect.

The following code example demonstrates how to use the BorderStyle enumeration and the BorderStyle, ShowLines, Scrollable, HideSelection and ShowRootLines properties. To run this example, paste the following code in a form and call the InitializeTreeView method in the form's constructor or Load method.

// 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;

.NET Framework
Available since 1.1
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