From 9bd1952d4ce113e12adcbe5d93b293cb07054aa2 Mon Sep 17 00:00:00 2001
From: Tracy Pearson <tracypearson@tracypearson.com>
Date: Fri, 12 Aug 2022 10:50:56 -0400
Subject: [PATCH] Unable to update Collection bound to UI

---
 WpfViewModelFirst/MainWindow.xaml        | 7 +++++--
 WpfViewModelFirst/MainWindowViewModel.cs | 5 +++++
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/WpfViewModelFirst/MainWindow.xaml b/WpfViewModelFirst/MainWindow.xaml
index 09e4c08..d699577 100644
--- a/WpfViewModelFirst/MainWindow.xaml
+++ b/WpfViewModelFirst/MainWindow.xaml
@@ -9,10 +9,11 @@
         mc:Ignorable="d"
         d:DataContext="{d:DesignInstance Type={x:Type local:MainWindowViewModel}}"
         Title="MainWindow" Height="450" Width="800">
-    <Grid Background="DarkRed"> 
+    <Grid> 
         <Grid.RowDefinitions>
             <RowDefinition/>
             <RowDefinition Height="auto"/>
+            <RowDefinition Height="auto"/>
         </Grid.RowDefinitions>
         <ContentControl Grid.Row="0" 
                         Visibility="Visible"
@@ -26,7 +27,9 @@
                 </DataTemplate>
             </ContentControl.Resources>
         </ContentControl>
-        <Button Grid.Row="1" 
+        <ListView Grid.Row="1" 
+                  ItemsSource="{Binding Strings}"/>
+        <Button Grid.Row="2" 
                 HorizontalAlignment="Center"
                 Command="{Binding StartCommand}" 
                 Content="Start"/>
diff --git a/WpfViewModelFirst/MainWindowViewModel.cs b/WpfViewModelFirst/MainWindowViewModel.cs
index db5fa43..1d5d423 100644
--- a/WpfViewModelFirst/MainWindowViewModel.cs
+++ b/WpfViewModelFirst/MainWindowViewModel.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
@@ -31,6 +32,7 @@ namespace WpfViewModelFirst
             {
                 System.Diagnostics.Debug.WriteLine(c.Result);
                 CurrentViewModel = new Part2ViewModel();
+                Strings.Add($"{DateTime.Now}");
             }, TaskContinuationOptions.OnlyOnRanToCompletion);
             //Task.Run(async () => await LongDelay()).ContinueWith(c =>
             //    {
@@ -48,5 +50,8 @@ namespace WpfViewModelFirst
         private ViewModelBase? _mainFrameViewModel;
         public ViewModelBase? CurrentViewModel { get => _mainFrameViewModel; set => SetProperty(ref _mainFrameViewModel, value); }
 
+        private ObservableCollection<string> _strings = new();
+        public ObservableCollection<string> Strings { get => _strings; set => SetProperty(ref _strings, value); }
+
     }
 }