TreeView.ShowRootLines プロパティ

.NET Framework クラス ライブラリ リファレンス

TreeView.ShowRootLines プロパティ

ツリー ビューのルートにあるツリー ノード間を結ぶ線を描画するかどうかを示す値を取得または設定します。

名前空間: System.Windows.Forms
アセンブリ: System.Windows.Forms (system.windows.forms.dll 内)
構文

Visual Basic (宣言)

Public Property ShowRootLines As
 Boolean

Visual Basic (使用法)

Dim instance As TreeView
Dim value As Boolean

value = instance.ShowRootLines

instance.ShowRootLines = value

C#

public bool ShowRootLines { get;
 set; }

C++

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

J#

/** @property */
public boolean get_ShowRootLines ()

/** @property */
public void set_ShowRootLines (boolean value)

JScript

public function get ShowRootLines
 () : boolean

public function set ShowRootLines
 (value : boolean)

プロパティ値
ツリー ビューのルートにあるツリー ノード間を結ぶ線を描画する場合は true。それ以外の場合は false。既定値は true です。

解説

ShowRootLines プロパティが false に設定されると、ルート ツリー ノードの横にプラス記号ボタンとマイナス記号ボタンは表示されません。また、ShowPlusMinus プロパティは無効になります。

使用例

BorderStyle 列挙体と、BorderStyle、ShowLines、Scrollable、HideSelection、および ShowRootLines の各プロパティの使用方法を次のコード例に示します。この例を実行するには、次のコードをフォームに貼り付けて、フォームのコンストラクタまたは Load メソッドで InitializeTreeView メソッドを呼び出します。

Visual Basic

' 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

C#

// 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);
}

J#

// 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

プラットフォーム

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

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0
.NET Compact Framework
サポート対象 : 2.0、1.0

参照

関連項目
TreeView クラス
TreeView メンバ
System.Windows.Forms 名前空間
TreeView.ShowPlusMinus プロパティ