Appending JSON file

CryptoCalc.csproj

@@ -6,4 +6,8 @@
     <UseWPF>true</UseWPF>
   </PropertyGroup>
 
+  <ItemGroup>
+    <PackageReference Include="Npgsql" Version="5.0.7" />
+  </ItemGroup>
+
 </Project>

MainWindow.xaml

@@ -7,6 +7,7 @@
         mc:Ignorable="d"
         Title="MainWindow" Height="450" Width="800">
     <Grid>
+        <Button x:Name="saveButton" Content="Save" HorizontalAlignment="Left" Margin="400,0,0,173" VerticalAlignment="Bottom" Height="216" Width="349" Click="saveButton_Click"/>
 
     </Grid>
 </Window>

MainWindow.xaml.cs

@@ -12,6 +12,9 @@ using System.Windows.Media;
 using System.Windows.Media.Imaging;
 using System.Windows.Navigation;
 using System.Windows.Shapes;
+using System.Diagnostics;
+using System.IO;
+using System.Text.Json;
 
 namespace CryptoCalc
 {
@@ -20,10 +23,41 @@ namespace CryptoCalc
     /// </summary>
     public partial class MainWindow : Window
     {
+        private readonly Random rand = new();
+
         public MainWindow()
         {
             InitializeComponent();
-            //asdf
+            
+        }
+
+        private void saveButton_Click(object sender, RoutedEventArgs e)
+        {
+            Debug.WriteLine("asdf");
+
+
+            var weatherForecast = new WeatherForecast
+            {
+                Date = DateTime.Parse("2019-08-01"),
+                TemperatureCelsius = rand.Next(0,100),
+                Summary = "Hot"
+
+            };
+
+            string fileName = "asdf.json";
+            string jsonString = JsonSerializer.Serialize(weatherForecast);
+            File.AppendAllText(fileName, jsonString);
+
+            Debug.WriteLine(File.ReadAllText(fileName));
         }
     }
+
+
+    public class WeatherForecast
+    {
+        public DateTimeOffset Date { get; set; }
+        public int TemperatureCelsius { get; set; }
+        public string Summary { get; set; }
+    }
+
 }