发生了预料之外的错误:
System.ArgumentException: 已添加了具有相同键的项。
在 System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
在 System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
在 JiJiDownForWPF.BatchDownload.but_SelectDownDir_Click(Object sender, RoutedEventArgs e)
在 System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
在 System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
在 System.Windows.Controls.Primitives.ButtonBase.OnClick()
在 System.Windows.Controls.Button.OnClick()
在 System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e)
在 System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
在 System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
在 System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
在 System.Windows.UIElement.ReRaiseEventAs(DependencyObject sender, RoutedEventArgs args, RoutedEvent newEvent)
在 System.Windows.UIElement.OnMouseUpThunk(Object sender, MouseButtonEventArgs e)
在 System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
在 System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
在 System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
在 System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
在 System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
在 System.Windows.Input.InputManager.ProcessStagingArea()
在 System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
在 System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
在 System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
在 System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
在 System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
在 MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
在 MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
在 System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
在 System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)