.net - "A generic error occurred in GDI+"加载带有动画 GIF 的 PictureBox 后

Question

我有一个 .NET 2.0 中的 Windows 窗体应用程序，窗体上有一个 PictureBox，我通过设置 PictureBox 的 ImageLocation 属性用动画 GIF 加载它。当动画渲染下一帧时，我得到以下异常和堆栈跟踪:

A generic error occurred in GDI+.
   at System.Drawing.Image.SelectActiveFrame(FrameDimension dimension, Int32 frameIndex)
   at System.Drawing.ImageAnimator.ImageInfo.UpdateFrame()
   at System.Drawing.ImageAnimator.UpdateFrames()
   at System.Windows.Forms.PictureBox.OnPaint(PaintEventArgs pe)
   at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer, Boolean disposeEventArgs)
   at System.Windows.Forms.Control.WmPaint(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
   at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
   at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.Run(Form mainForm)
   at AIRNow.IMS.Mapper.MapWizard.Main() in C:\Projects\AIRNowI\IMS\UserInterface\MapWizard\MapWizard.cs:line 14
   at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
   at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
   at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()

Answer 1

mcdon 的回答很接近，甚至是正确的。问题是，如果您让 PictureBox 从 ImageLocation 属性中命名的文件中加载图片，则流可能会在执行 Load() 后关闭，但之前所有帧都已加载(可能仅加载第一帧)。因此，如果您使用 Image.FromFile() 将图片手动加载到 Image 对象，并将该对象提供给 PictureBox，就可以避免这种情况通过其 Image 属性。