KeyNotFoundException: 给定关键字不在字典中。
StackTrace:
   在 System.ThrowHelper.ThrowKeyNotFoundException()
   在 System.Collections.Generic.Dictionary`2.get_Item(TKey key)
   在 System.Windows.SystemResources.OnShutdownFinished(Object sender, EventArgs args)
   在 System.EventHandler.Invoke(Object sender, EventArgs e)
   在 System.Windows.Threading.Dispatcher.ShutdownImplInSecurityContext(Object state)
   在 MS.Internal.CulturePreservingExecutionContext.CallbackWrapper(Object obj)
   在 System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   在 System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   在 System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   在 MS.Internal.CulturePreservingExecutionContext.Run(CulturePreservingExecutionContext executionContext, ContextCallback callback, Object state)
   在 System.Windows.Threading.Dispatcher.ShutdownImpl()
   在 System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
   在 System.Windows.Application.RunDispatcher(Object ignore)
   在 System.Windows.Application.RunInternal(Window window)
   在 Quicker.App.Main()