Мне нужно отсканировать кучу файлов Outlook .msg, и я использую для этого библиотеку MsgReader. (проект библиотеки MsgReader на Github) Я написал следующий метод, который открывает сообщение, просматривает каждое из свойств и извлекает любые из тех, которые помечены как «строка», для добавления в словарь для возвратадля звонящего.Вот код:
public Dictionary<string, string> GetMsgFileDetails(string filepath)
{
Dictionary<string, string> filedetails = new Dictionary<string, string>();
//try
{
string fullpath = Path.Combine(SelectedFolder, filepath);
var msg = new Storage.Message(fullpath);
foreach (var prop in msg.GetType().GetProperties())
{
string pname = prop.Name;
if (prop.GetValue(msg) != null)
{
object pvalue = prop.GetValue(msg);
}
// We only want the strings
if (prop.GetValue(msg) != null && (prop.GetValue(msg) is string))
{
filedetails.Add(prop.Name, prop.GetValue(msg).ToString());
}
}
return filedetails;
}
//catch (Exception ex)
//{
// MessageBox.Show(ex.Message, "Error trying to load file");
// return null;
//}
}
(the try-catch block is commented out to allow easier debugging).
Кажется, что все работает просто отлично, но оно достигает одного из значений, что приводит к разрыву строки
(prop.GetValue(msg) != null)
с System Reflection TargetInvocationException.Подробности исключений следующие:
C:\Users\Brett\source\repos\FileMunger\FileMunger\ViewModels\FolderContext.cs:line 208
at FileThing.ViewModels.FolderContext.GetProperties(String filepath, Boolean showwindow) in C:\Users\Brett\source\repos\FileMunger\FileMunger\ViewModels\FolderContext.cs:line 159
at FileMunger.MainWindow.FileList_Selected(Object sender, RoutedEventArgs e) in C:\Users\Brett\source\repos\FileMunger\FileMunger\MainWindow.xaml.cs:line 121
at system.Windows.Controls.SelectionChangedEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
at System.Windows.UIElement.RaiseEvent(RoutedEventArgs e)
at System.Windows.Controls.ListBox.OnSelectionChanged(SelectionChangedEventArgs e)
at System.Windows.Controls.Primitives.Selector.InvokeSelectionChanged(List`1 unselectedInfos, List`1 selectedInfos)
at System.Windows.Controls.Primitives.Selector.SelectionChanger.End()
at System.Windows.Controls.Primitives.Selector.SelectionChanger.SelectJustThisItem(ItemInfo info, Boolean assumeInItemsCollection)
at System.Windows.Controls.ListBox.MakeSingleSelection(ListBoxItem listItem)
at System.Windows.Controls.ListBox.NotifyListItemClicked(ListBoxItem item, MouseButton mouseButton)
at System.Windows.Controls.ListBoxItem.HandleMouseButtonDown(MouseButton mouseButton)
at System.Windows.Controls.ListBoxItem.OnMouseLeftButtonDown(MouseButtonEventArgs e)
at System.Windows.UIElement.OnMouseLeftButtonDownThunk(Object sender, MouseButtonEventArgs e)
at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
at System.Windows.UIElement.ReRaiseEventAs(DependencyObject sender, RoutedEventArgs args, RoutedEvent newEvent)
at System.Windows.UIElement.OnMouseDownThunk(Object sender, MouseButtonEventArgs e)
at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
at System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
at System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted)
at System.Windows.Input.InputManager.ProcessStagingArea()
at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
at System.Windows.Application.RunDispatcher(Object ignore)
at System.Windows.Application.RunInternal(Window window)
at System.Windows.Application.Run(Window window)
at System.Windows.Application.Run()
at FileMunger.App.Main()
Inner Exception 1:
NullReferenceException: Object reference not set to an instance of an object.
Похоже, это связано с тем, что значение prop.GetValue равно null, но я пытаюсь это проверить.Я понимаю, что это может оказаться в глубине размышлений, когда я не являюсь экспертом, поэтому, если у кого-то есть какие-либо идеи, как сделать эту проверку, я действительно ценю это.Приветствия.