我在寻找在.NET的WinForms一个拆分按钮。那种，其中一侧是一个按钮，而另一侧有一个下拉按钮。

I'm looking for a Split Button in .NET WinForms. The kind where one side is a button and the other side has a dropdown button.

我看到他们用遍了在窗口，就像在Visual Studio另存为窗口，所以我想他们已经得到了在某些库中的控制。

I see them used all over in windows, like in the Visual Studio Save As window, so I figured they've got to have the control in some library.

我知道有一个用于toolstrips，但我需要那可用外toolstrips的。

I know there's one for toolstrips, but I need one thats usable outside of toolstrips.

有没有，有一个或preferably一个免费的图书馆微软库？ 我使用.NET 3.5

Is there a Microsoft library that has one or preferably a free library? I'm using .NET 3.5

有关的例子：

For an example:

推荐答案

您也可以自己做一个简单的版本，使用该按钮的图像。我有一个从按钮。

You can do a simple version yourself, using the button's image. I have my own class that is derived from Button.

我设置的图像（这是一个向下的箭头的），像这样：

I set up the image (which is of a down arrow) like so:

{
    this.ImageAlign = System.Drawing.ContentAlignment.MiddleRight;
    this.Image = YourResources.split_button; // Your down-arrow image

    this.TextImageRelation = System.Windows.Forms.TextImageRelation.TextBeforeImage;
}


protected override void OnClick(EventArgs e)
{
    var clickPos = this.PointToClient(new System.Drawing.Point(MousePosition.X, MousePosition.Y));

    // If click is over the right-hand portion of the button show the menu
    if (clickPos.X >= (Size.Width - Image.Width))
        ShowMenuUnderControl()
    else
        base.OnClick(e);
}

// If you want right-mouse click to invoke the menu override the mouse up event
protected override void OnMouseUp(MouseEventArgs mevent)
{
    if ((mevent.Button & MouseButtons.Right) != 0)
        ShowMenuUnderControl();
    else
        base.OnMouseUp(mevent);
}

// Raise the context menu
public void ShowMenuUnderControl()
{
    splitMenuStrip.Show(this, new Point(0, this.Height), ToolStripDropDownDirection.BelowRight);
}

如果您还想要一个图标，在OP，您可以使用的BackgroundImage 和适当的填充，比如：

If you also wanted an icon, as in the OP, you could use a BackgroundImage and appropriate padding, like so:

this.BackgroundImageLayout = ImageLayout.None;
this.BackgroundImage = YourResources.ButtonIcon;

// Add padding so the text doesn't overlay the background image
this.Padding = new Padding(
    this.Padding.Left + this.BackgroundImage.Width,
    this.Padding.Top,
    this.Padding.Right,
    this.Padding.Bottom);

下面是我在行动的按钮：

Here's a button of mine in action: