Question

我真的无法弄清楚发生了什么以及为什么会一直发生这种情况调用目标引发了异常。

代码在 frm5

中运行

然后错误显示在
Program.cs：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;

namespace BlueStitch
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new frmMain());
        }
    }
}

它位于Application.Run(new frmMain());

行

它说TargetInvocationException was unhandled - Exception has been thrown by the target of an invocation.

这个例外

System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.ArgumentException: Parameter is not valid.
at System.Drawing.Image.get_FrameDimensionsList()
at System.Drawing.ImageAnimator.CanAnimate(Image image)
at System.Drawing.ImageAnimator.ImageInfo..ctor(Image image)
at System.Drawing.ImageAnimator.Animate(Image image, EventHandler onFrameChangedHandler)
at System.Windows.Forms.PictureBox.Animate(Boolean animate)
at System.Windows.Forms.Control.SetVisibleCore(Boolean value)
at BlueStitch.frmStitch.backgroundWorker1_RunWorkerCompleted(Object sender, RunWorkerCompletedEventArgs e) in C:\Users\Freddie Rosillo\Documents\Visual Studio 2008\Projects\BlueStitch\BlueStitch\BlueStitch\frmStitch.cs:line 976
--- End of inner exception stack trace ---
at System.RuntimeMethodHandle._InvokeMethodFast(Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
at System.Delegate.DynamicInvokeImpl(Object[] args)
at System.Windows.Forms.Control.InvokeMarshaledCallbackDo(ThreadMethodEntry tme)
at System.Windows.Forms.Control.InvokeMarshaledCallbackHelper(Object obj)
at System.Threading.ExecutionContext.runTryCode(Object userData)
at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Windows.Forms.Control.InvokeMarshaledCallback(ThreadMethodEntry tme)
at System.Windows.Forms.Control.InvokeMarshaledCallbacks()
at System.Windows.Forms.Control.WndProc(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 BlueStitch.Program.Main() in C:\Users\Freddie Rosillo\Documents\Visual Studio 2008\Projects\BlueStitch\BlueStitch\BlueStitch\Program.cs:line 21

Answer 1

您正在执行frmMain构造函数中的一些不应该在那里执行的代码。移动该代码并在Form Shown事件上执行它。

Answer 2

我不是图形人，但是失败的一行：

System.Drawing.Image.get_FrameDimensionsList（）

进行一些GDI +调用并且似乎想要图像的FrameDimensionsCount的某些值...它是你正在处理的GIF动画吗？还是TIFF？

查看GdipImageGetFrameDimensionsCount的文档，看看是否有任何树枝。下面的反编译失败的getter：

[Browsable(false)]
    public Guid[] FrameDimensionsList
    {
      get
      {
        int count;
        int frameDimensionsCount = SafeNativeMethods.Gdip.GdipImageGetFrameDimensionsCount(new HandleRef((object) this, this.nativeImage), out count);
        if (frameDimensionsCount != 0)
          throw SafeNativeMethods.Gdip.StatusException(frameDimensionsCount);
        if (count <= 0)
          return new Guid[0];
        int num1 = Marshal.SizeOf(typeof (Guid));
        IntPtr num2 = Marshal.AllocHGlobal(num1 * count);
        if (num2 == IntPtr.Zero)
          throw SafeNativeMethods.Gdip.StatusException(3);
        int frameDimensionsList = SafeNativeMethods.Gdip.GdipImageGetFrameDimensionsList(new HandleRef((object) this, this.nativeImage), num2, count);
        if (frameDimensionsList != 0)
        {
          Marshal.FreeHGlobal(num2);
          throw SafeNativeMethods.Gdip.StatusException(frameDimensionsList);
        }
        else
        {
          Guid[] guidArray = new Guid[count];
          try
          {
            for (int index = 0; index < count; ++index)
              guidArray[index] = (Guid) System.Drawing.UnsafeNativeMethods.PtrToStructure((IntPtr) ((long) num2 + (long) (num1 * index)), typeof (Guid));
          }
          finally
          {
            Marshal.FreeHGlobal(num2);
          }
          return guidArray;
        }
      }
    }

Answer 3

看起来好像你正在使用BackgroundWorker在后台线程上做一些工作。检查您是否在UI线程上没有做任何必须完成的事情。如果您暂时更改代码以同步执行工作，问题是否会消失？

请注意，在各种情况下，COM方法会抛出ArgumentException。如果参数为2,13,14,15,16,19或20，SafeNativeMethods.Gdip.StatusException的来源可能会抛出ArgumentException。还有其他一些关于类似问题的帖子here和here。

Answer 4

当您尝试从 frmStitch.backgroundWorker1_RunWorkerCompleted 方法中获取FrameDimensionsList属性时，它无法找到该属性，因为您位于BackgroundWorker线程之外。在BackgroundWorker线程中完成工作后，RunWorkerCompleted将在原始线程中执行代码。

我们通常使用 BackgroundWorker.ReportProgress 方法从BGW线程到主线程进行通信。为了反过来传达（这似乎是你想要做的事情），我会考虑从BGW线程订阅主线程中的事件，以便BGW线程可以基于某些东西更新相关属性你是在主线程中做的。

Alternatively, check out this post

Answer 5

.NET中的每个异常都将落在Application.Run(new frmMain());行上，因为此方法运行一个消息循环，除非窗口关闭，否则它将保持活动状态。

但是，你的异常是在GDI +上播放图像时总是抛出的常见异常，并且GDI已知内存泄漏导致此错误，最终由于没有更多内存可用错误。

一旦我看到你正在使用图像做什么，我就可以写更多关于你的错误的信息，很可能你的图像所用的记忆不会被释放而导致这个问题。在WPF中解决了这些带有图像的内存问题，在WPF上切换到图像操作不会导致这些错误。您仍然可以在.NET Forms中使用WPF来处理图像而不会导致内存错误，并根据需要使用Windows窗体。

TargetInvocationException未处理 - c＃

5 个答案: