TreeView.Indent 属性
获取或设置每个子树节点级别的缩进距离。
**命名空间:**System.Windows.Forms
**程序集:**System.Windows.Forms（在 system.windows.forms.dll 中）
语法
声明
<LocalizableAttribute(True)> _
Public Property Indent As Integer
用法
Dim instance As TreeView
Dim value As Integer
value = instance.Indent
instance.Indent = value
[LocalizableAttribute(true)]
public int Indent { get; set; }
[LocalizableAttribute(true)]
public:
property int Indent {
int get ();
void set (int value);
}
/** @property */
public int get_Indent ()
/** @property */
public void set_Indent (int value)
public function get Indent () : int
public function set Indent (value : int)
属性值
每个子树节点级别的缩进距离（以像素为单位）。默认值为 19。
异常
| 异常类型 | 条件 |
|---|---|
分配的值小于 0（请参见“备注”）。 - 或 - 分配的值大于 32,000。 |
备注
将 Indent 设置为小于 16 的值将不会有任何节点缩进作用。
如果将此属性的值设置为 -1，只要以前从未更改过此属性的默认值，就不会引发异常。这是因为在创建控件句柄之前，控件使用值 -1 作为内部默认值。此内部默认值将导致包装后的控件返回其自身的默认值 19。
示例
下面的代码示例演示一个自定义的 TreeView。通过继承 TreeView 类，此自定义版本具有典型 TreeView 的所有功能。在构造函数中更改不同的属性值可以提供独特的外观。由于 ShowPlusMinus 属性设置为 false，因此该自定义控件还重写 OnAfterSelect 方法，以便单击节点时能够展开和折叠它们。
以这种方式自定义的控件可以在整个单位中使用，因此很容易提供一致的界面，而不需要在每个单独的项目中指定控件属性。
Public Class CustomizedTreeView
Inherits TreeView
Public Sub New()
' Customize the TreeView control by setting various properties.
BackColor = System.Drawing.Color.CadetBlue
FullRowSelect = True
HotTracking = True
Indent = 34
ShowPlusMinus = False
' The ShowLines property must be false for the FullRowSelect
' property to work.
ShowLines = False
End Sub 'New
Protected Overrides Sub OnAfterSelect(ByVal e As TreeViewEventArgs)
' Confirm that the user initiated the selection.
' This prevents the first node from expanding when it is
' automatically selected during the initialization of
' the TreeView control.
If e.Action <> TreeViewAction.Unknown Then
If e.Node.IsExpanded Then
e.Node.Collapse()
Else
e.Node.Expand()
End If
End If
' Remove the selection. This allows the same node to be
' clicked twice in succession to toggle the expansion state.
SelectedNode = Nothing
End Sub 'OnAfterSelect
End Class 'CustomizedTreeView
public class CustomizedTreeView : TreeView
{
public CustomizedTreeView()
{
// Customize the TreeView control by setting various properties.
BackColor = System.Drawing.Color.CadetBlue;
FullRowSelect = true;
HotTracking = true;
Indent = 34;
ShowPlusMinus = false;
// The ShowLines property must be false for the FullRowSelect
// property to work.
ShowLines = false;
}
protected override void OnAfterSelect(TreeViewEventArgs e)
{
// Confirm that the user initiated the selection.
// This prevents the first node from expanding when it is
// automatically selected during the initialization of
// the TreeView control.
if (e.Action != TreeViewAction.Unknown)
{
if (e.Node.IsExpanded)
{
e.Node.Collapse();
}
else
{
e.Node.Expand();
}
}
// Remove the selection. This allows the same node to be
// clicked twice in succession to toggle the expansion state.
SelectedNode = null;
}
}
public ref class CustomizedTreeView: public TreeView
{
public:
CustomizedTreeView()
{
// Customize the TreeView control by setting various properties.
BackColor = System::Drawing::Color::CadetBlue;
FullRowSelect = true;
HotTracking = true;
Indent = 34;
ShowPlusMinus = false;
// The ShowLines property must be false for the FullRowSelect
// property to work.
ShowLines = false;
}
protected:
virtual void OnAfterSelect( TreeViewEventArgs^ e ) override
{
// Confirm that the user initiated the selection.
// This prevents the first node from expanding when it is
// automatically selected during the initialization of
// the TreeView control.
if ( e->Action != TreeViewAction::Unknown )
{
if ( e->Node->IsExpanded )
{
e->Node->Collapse();
}
else
{
e->Node->Expand();
}
}
// Remove the selection. This allows the same node to be
// clicked twice in succession to toggle the expansion state.
SelectedNode = nullptr;
}
};
public class CustomizedTreeView extends TreeView
{
public CustomizedTreeView()
{
// Customize the TreeView control by setting various properties.
set_BackColor(System.Drawing.Color.get_CadetBlue());
set_FullRowSelect(true);
set_HotTracking(true);
set_Indent(34);
set_ShowPlusMinus(false);
// The ShowLines property must be false for the FullRowSelect
// property to work.
set_ShowLines(false);
} //CustomizedTreeView
protected void OnAfterSelect(TreeViewEventArgs e)
{
// Confirm that the user initiated the selection.
// This prevents the first node from expanding when it is
// automatically selected during the initialization of
// the TreeView control.
if (!(e.get_Action().Equals(TreeViewAction.Unknown))) {
if (e.get_Node().get_IsExpanded()) {
e.get_Node().Collapse();
}
else {
e.get_Node().Expand();
}
}
// Remove the selection. This allows the same node to be
// clicked twice in succession to toggle the expansion state.
set_SelectedNode(null);
} //OnAfterSelect
}//CustomizedTreeView
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
.NET Compact Framework
受以下版本支持：2.0、1.0