TreeView.Scrollable 属性
获取或设置一个值，用以指示树视图控件是否在需要时显示滚动条。
**命名空间:**System.Windows.Forms
**程序集:**System.Windows.Forms（在 system.windows.forms.dll 中）
语法
声明
Public Property Scrollable As Boolean
用法
Dim instance As TreeView
Dim value As Boolean
value = instance.Scrollable
instance.Scrollable = value
public bool Scrollable { get; set; }
public:
property bool Scrollable {
bool get ();
void set (bool value);
}
/** @property */
public boolean get_Scrollable ()
/** @property */
public void set_Scrollable (boolean value)
public function get Scrollable () : boolean
public function set Scrollable (value : boolean)
属性值
如果树视图控件在需要时显示滚动条，则为 true；否则为 false。默认为 true。
备注
如果此属性设置为 true，那么当任何 TreeNode 位于控件的客户端区域之外时，TreeView 上将显示滚动条。
提示
在运行时设置 Scrollable 属性时，将重新创建 TreeView 句柄（请参见 Control.RecreateHandle）以更新控件的外观。这将折叠除选定的 TreeNode 之外的所有树节点。
示例
下面的代码示例演示如何使用 BorderStyle 枚举以及BorderStyle、ShowLines、Scrollable、HideSelection 和 ShowRootLines 属性。若要运行该示例，请将以下代码粘贴到一个窗体中，并从该窗体的构造函数或 Load 方法中调用 InitializeTreeView 方法。
' 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
// 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.
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.set_Location(new System.Drawing.Point(72, 48));
this.treeView1.set_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.set_BorderStyle(BorderStyle.None);
this.treeView1.set_BackColor(this.get_BackColor());
this.treeView1.set_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.set_HideSelection(false);
// Set the ShowRootLines and ShowLines properties to false to
// give the TreeView a list-like appearance.
this.treeView1.set_ShowRootLines(false);
this.treeView1.set_ShowLines(false);
// Add the nodes.
this.treeView1.get_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.set_TabIndex(0);
this.get_Controls().Add(this.treeView1);
} //InitializeTreeView
平台
Windows 98、Windows 2000 SP4、Windows CE、Windows Millennium Edition、Windows Mobile for Pocket PC、Windows Mobile for Smartphone、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition
.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。
版本信息
.NET Framework
受以下版本支持：2.0、1.1、1.0