Question

我有一个trackBar的Scroll事件：

private void trackBar1_Scroll(object sender, EventArgs e)
        {

                trackbarCounter++;
                if (manualDone == true)
                {
                    myTrackPanelss1.trackBar1.Minimum = 0;
                    myTrackPanelss1.trackBar1.Maximum = _fi.Length - 1;                    setpicture(myTrackPanelss1.trackBar1.Value);
                    this.pictureBox1.Refresh();
                }
                if (automaticDone == true)
                {
                    myTrackPanelss1.trackBar1.Minimum = 0;
                    myTrackPanelss1.trackBar1.Maximum = fiAutomatic.Length - 1;
                    long[] tt = list_of_histograms[myTrackPanelss1.trackBar1.Value];
                    long res = GetTopLumAmount(tt, 1000);
                    long max = GetHistogramMaximum(tt);
                    GetHistogramAverage(tt);
                    setpicture(myTrackPanelss1.trackBar1.Value);
                    this.pictureBox1.Refresh();

                                    }

        }

例外是在这一行：

long[] tt = list_of_histograms[myTrackPanelss1.trackBar1.Value];

在我点击trackBar并在这种情况下向右移动它这次它到达帧/轨道40然后在那里抛出异常。

例外：

指数超出范围。必须是非负数且小于集合的大小。参数名称：index

现在fiAutomatic变量包含2225个索引，例如索引[0]中我看到：{000001.bmp} 在索引[1]中，我看到：{000002.bmp} 等等。

list_of_histograms现在包含每个索引中的40个索引我有一个256索引，例如在index [0]中我看到：{[long256]}我看到索引[0] 256个数字。然后在索引[1]再次{[long256]}和另外256个数字等等。

trackBar值为40。

但是为什么当我在40帧/图像之后将trackBar向右移动时会抛出这个异常呢？

这是完整的异常消息：

System.ArgumentOutOfRangeException was unhandled
  Message=Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
  Source=mscorlib
  ParamName=index
  StackTrace:
       at System.ThrowHelper.ThrowArgumentOutOfRangeException()
       at System.Collections.Generic.List`1.get_Item(Int32 index)
       at Extracting_Frames.Form1.trackBar1_Scroll(Object sender, EventArgs e) in D:\C-Sharp\Extracting_Frames\Extracting_Frames\Extracting_Frames\Form1.cs:line 1793
       at System.Windows.Forms.TrackBar.OnScroll(EventArgs e)
       at System.Windows.Forms.TrackBar.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.SendMessage(HandleRef hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
       at System.Windows.Forms.Control.SendMessage(Int32 msg, IntPtr wparam, IntPtr lparam)
       at System.Windows.Forms.Control.ReflectMessageInternal(IntPtr hWnd, Message& m)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.ScrollableControl.WmHScroll(Message& m)
       at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
       at System.Windows.Forms.UserControl.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.CallWindowProc(IntPtr wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
       at System.Windows.Forms.NativeWindow.DefWndProc(Message& m)
       at System.Windows.Forms.Control.DefWndProc(Message& m)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.TrackBar.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(IntPtr 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 Extracting_Frames.Program.Main() in D:\C-Sharp\Extracting_Frames\Extracting_Frames\Extracting_Frames\Program.cs:line 18
       at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       at System.AppDomain.nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       at System.Runtime.Hosting.ManifestRunner.Run(Boolean checkAptModel)
       at System.Runtime.Hosting.ManifestRunner.ExecuteAsAssembly()
       at System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContext activationContext, String[] activationCustomData)
       at System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContext activationContext)
       at System.Activator.CreateInstance(ActivationContext activationContext)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssemblyDebugInZone()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException:

Answer 1

list_of_histograms is a contain now 40 indexs in each index

这将是你的问题。请记住，当您声明某些内容时，它会将其从0开始索引。因此，40个索引意味着它最大值为39.执行list_of_histograms[40]会导致错误。

编辑：现在，当我去重新点赞时，我注意到你对这个问题的评论......

为什么我得到ArgumentOutOfRangeException？

1 个答案: