Question

将UserControl添加到DevExpress的图片编辑控件后，我能够成功将其放在某个位置并保存更改。

重新打开应用程序后，当我使用图像填充PictureEdit然后将UserControl添加到pictureEdit控件集合时，错误图像将显示在PictureEdit中，同时显示消息“对象引用未设置为对象的实例” - ＆gt; null reference。

System.NullReferenceException: Object reference not set to an instance of an object.
   at DevExpress.XtraEditors.PictureEditScrollers.SetScrollBarValues()
   at DevExpress.XtraEditors.PictureEditScrollers.DisplayScrollBars()
   at DevExpress.XtraEditors.PictureEditScrollers.TryDisplayScrollBars(Boolean force)
   at DevExpress.XtraEditors.PictureEdit.UpdateViewInfo(Graphics g)
   at DevExpress.XtraEditors.BaseControl.OnPaint(PaintEventArgs e)
   at System.Windows.Forms.Control.PaintTransparentBackground(PaintEventArgs e, Rectangle rectangle, Region transparentRegion)
   at System.Windows.Forms.Control.PaintTransparentBackground(PaintEventArgs e, Rectangle rectangle)
   at System.Windows.Forms.Control.PaintBackground(PaintEventArgs e, Rectangle rectangle, Color backColor, Point scrollOffset)
   at System.Windows.Forms.Control.PaintBackground(PaintEventArgs e, Rectangle rectangle)
   at System.Windows.Forms.Control.OnPaintBackground(PaintEventArgs pevent)
   at System.Windows.Forms.ScrollableControl.OnPaintBackground(PaintEventArgs e)
   at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer)
   at System.Windows.Forms.Control.WmEraseBkgnd(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

但是，如果我没有将UserControl添加到控件集合中，则图像会完美显示，但我失去了对PictureEdit的用户控制权。

任何建议？

Answer 1

以防万一对别人有帮助：

强制创建你的控件。

picEdit.CreateControl();

将控件添加到PictureEdit

1 个答案: