问.NET Winforms中的拆分按钮

EN

{
    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);
}

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);