单击webbrowser控件中的链接时，如何避免UnauthorizedAccessException？

Question

我创建了一个小型网络机器人来点击网页上的链接但是我遇到了一个小问题。目前，在某些选定的网站上，当我尝试点击链接时，我会收到一个访问例外。我试图对这些进行一些研究，但没有发现与我的问题有关 - 大多数都是iFrame的问题，这不适用于我，因为我正在使用的网站没有任何问题。什么可能阻止我点击某些网站上的链接而不是其他网站？我该怎么办才能解决这个问题？

For j = 0 To WebBrowser1.Document.DomDocument.all.length - 1
    HTMLElementMain = WebBrowser1.Document.DomDocument.all.item(j)
    If Not HTMLElementMain Is Nothing Then
        If StrComp(HTMLElementMain.TagName, "a", CompareMethod.Text) = 0 Then
            If HTMLElementMain.href <> Nothing Then
                HTMLElementHrefStr = HTMLElementMain.href
                HTMLElementMain.Click()
            End if
        End if
    End if
Next

错误的痕迹：

System.UnauthorizedAccessException was unhandled
  Message="Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))"
  Source="mscorlib"
  StackTrace:
       at System.RuntimeType.InvokeDispMethod(String name, BindingFlags invokeAttr, Object target, Object[] args, Boolean[] byrefModifiers, Int32 culture, String[] namedParameters)
       at System.RuntimeType.InvokeMember(String name, BindingFlags bindingFlags, Binder binder, Object target, Object[] providedArgs, ParameterModifier[] modifiers, CultureInfo culture, String[] namedParams)
       at Microsoft.VisualBasic.CompilerServices.VBBinder.InvokeMember(String name, BindingFlags invokeAttr, Type objType, IReflect objIReflect, Object target, Object[] args, String[] namedParameters)
       at Microsoft.VisualBasic.CompilerServices.LateBinding.InternalLateCall(Object o, Type objType, String name, Object[] args, String[] paramnames, Boolean[] CopyBack, Boolean IgnoreReturn)
       at Microsoft.VisualBasic.CompilerServices.NewLateBinding.LateCall(Object Instance, Type Type, String MemberName, Object[] Arguments, String[] ArgumentNames, Type[] TypeArguments, Boolean[] CopyBack, Boolean IgnoreReturn)
       at YTAA.YTAA.btnBegin_Click(Object sender, EventArgs e) in xxxxxxxxxxxxxx
       at System.Windows.Forms.Control.OnClick(EventArgs e)
       at System.Windows.Forms.Button.OnClick(EventArgs e)
       at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
       at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.ButtonBase.WndProc(Message& m)
       at System.Windows.Forms.Button.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(ApplicationContext context)
       at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()
       at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()
       at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine)
       at YTAA.My.MyApplication.Main(String[] Args) in 17d14f5c-a337-4978-8281-53493378c1071.vb:line 81
       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()
  InnerException: