DotNetBar for WinForms是一个拥有89个组件的用户界面控件套包，用户可以使用Visual Studio 2005-2015轻松地创建专业的用户界面。十多年来DotNetBar帮助开发人员轻松地创建易用的专业Windows Forms (WinForms) 用户界面。DotNetBar是全世界第一个引入全功能Office 2013、Office 2010、Windows 7、 Office 2007 style Ribbon控件以及Visual Studio 2005-2013，Metro等主题风格和样式的控件。

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如何在WinForms AdvTree控件的DotNetBar中显示行号

仅使用几行代码，就有可能在AdvTree的左边距中呈现任何内容，本文将说明如何添加行号。

向控件集advTree添加边距。BackgroundStyle.PaddingLeft = 24 property。在此示例中，它将设置为24像素。处理advTree.Render和advTree.GetRenderer（）。RenderNodeBackground事件以渲染左边距背景和行号。您可以将此代码放置在表单加载事件中：

advTree1.Render + =new AdvTreeRenderEventHandler（AdvTreeRender）;
advTree1.GetRenderer（）。RenderNodeBackground + =new NodeRendererEventHandler（TreeRenderNodeBackground）;

void TreeRenderNodeBackground(object sender, DevComponents.AdvTree.Display.NodeRendererEventArgs e)
{
    Graphics g = e.Graphics;
    Node n = e.Node;
    Rectangle r = e.NodeBounds;
    Rectangle numberBounds = new Rectangle(4, r.Y, advTree1.BackgroundStyle.PaddingLeft - 4, r.Height);
 
    Region oldClip = g.Clip;
 
    int i = advTree1.GetNodeFlatIndex(n);
    Rectangle lineNumberBounds = advTree1.ClientRectangle;
    lineNumberBounds.X += 1; // Border
    lineNumberBounds.Width = advTree1.BackgroundStyle.PaddingLeft - 1;
    lineNumberBounds.Y = advTree1.Columns.Bounds.Bottom;
    lineNumberBounds.Height = lineNumberBounds.Height - advTree1.Columns.Bounds.Bottom;
    if (advTree1.HScrollBar != null && advTree1.HScrollBar.Visible)
        lineNumberBounds.Height -= advTree1.HScrollBar.Height;
    g.SetClip(lineNumberBounds);
    g.SetClip(numberBounds, System.Drawing.Drawing2D.CombineMode.Intersect);
    g.DrawString(i.ToString(), advTree1.Font, Brushes.Red, numberBounds.Location);
 
    g.Clip = oldClip;
}
 
void AdvTreeRender(object sender, AdvTreeRenderEventArgs e)
{
    if (e.RenderType == eAdvTreeRenderType.Background)
    {
        AdvTree tree = (AdvTree)sender;
        Graphics g = e.Graphics;
        Region oldClip = g.Clip;
        g.ResetClip();
        g.FillRectangle(Brushes.WhiteSmoke, new Rectangle(0, 0, 24, tree.Height));
        g.Clip = oldClip;
    }
}

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