From ff9c9c7b55ac52d7c26dd5cead6586c2c651a8fe Mon Sep 17 00:00:00 2001
From: Tracy Pearson <tracypearson@tracypearson.com>
Date: Fri, 12 Aug 2022 12:30:18 -0400
Subject: [PATCH] Get the dispatcher before the Task.

---
 WpfViewModelFirst/MainWindowViewModel.cs | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/WpfViewModelFirst/MainWindowViewModel.cs b/WpfViewModelFirst/MainWindowViewModel.cs
index 1d5d423..b1f7231 100644
--- a/WpfViewModelFirst/MainWindowViewModel.cs
+++ b/WpfViewModelFirst/MainWindowViewModel.cs
@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.Linq;
 using System.Text;
+using System.Threading;
 using System.Threading.Tasks;
 using System.Windows.Input;
 using System.Windows.Threading;
@@ -23,22 +24,22 @@ namespace WpfViewModelFirst
         {
             CurrentViewModel = null;
             CurrentViewModel = new Part1ViewModel(Part1Action);
-//            MainFrameViewModel = new Part2ViewModel();
+            //            MainFrameViewModel = new Part2ViewModel();
         }
         private void Part1Action()
         {
+            var currentDispatcher = Dispatcher.CurrentDispatcher;
             CurrentViewModel = null;
-            Task delay = Task.Run(LongDelay).ContinueWith(c =>
+            Task delay = Task<string>.Run(LongDelay).ContinueWith(c =>
             {
                 System.Diagnostics.Debug.WriteLine(c.Result);
                 CurrentViewModel = new Part2ViewModel();
-                Strings.Add($"{DateTime.Now}");
+                currentDispatcher.Invoke(() =>
+                {
+                    Strings.Add($"{DateTime.Now}");
+                }
+                    );
             }, TaskContinuationOptions.OnlyOnRanToCompletion);
-            //Task.Run(async () => await LongDelay()).ContinueWith(c =>
-            //    {
-            //        System.Diagnostics.Debug.WriteLine(c.Result);
-            //CurrentViewModel = new Part2ViewModel();
-            //}, TaskContinuationOptions.OnlyOnRanToCompletion);
         }
 
         private async Task<string> LongDelay()