Error handling system added

Views/NewPointDialog.axaml.cs

@@ -1,6 +1,8 @@
-using Avalonia.Controls;
+using System;
+using Avalonia.Controls;
 using CommunityToolkit.Mvvm.Messaging;
 using GazpromApp.Messages;
+using GazpromApp.ViewModels;
 
 namespace GazpromApp.Views;
 
@@ -10,9 +12,25 @@ public partial class NewPointDialog : Window
     {
         InitializeComponent();
 
+        // done entering new point
         WeakReferenceMessenger.Default.Register<NewPointDialog, NewPointDone>(this, static (w, m) =>
         {
             w.Close(m.Point);
         });
+
+        // register to work with errors
+        WeakReferenceMessenger.Default.Register<NewPointDialog, ErrorMessage>(this, static (w, m) =>
+        {
+            ErrorView dialog = new ErrorView()
+            {
+                DataContext = m.Error
+            };
+            m.Reply(dialog.ShowDialog<ErrorViewModel?>(w));
+        });
+    }
+
+    private void Window_OnClosed(object? sender, EventArgs e)
+    {
+        WeakReferenceMessenger.Default.Unregister<ErrorMessage>(this);
     }
 }