adding mainwindowviewmodel

WD7UVN_SzTGUI_2023242.Client.WPF/MainWindow.xaml

@@ -3,9 +3,14 @@
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
-        xmlns:local="clr-namespace:WD7UVN_SzTGUI_2023242.Client.WPF"
+        xmlns:local="clr-namespace:WD7UVN_SzTGUI_2023242.Client.WPF.ViewModels"
         mc:Ignorable="d"
         Title="Company database manager" Height="450" Width="900">
+
+    <Window.DataContext>
+        <local:MainWindowViewModel/>
+    </Window.DataContext>
+
     <Grid>
         <Grid.ColumnDefinitions>
             <ColumnDefinition Width="*" />

WD7UVN_SzTGUI_2023242.Client.WPF/ViewModels/MainWindowViewModel.cs

@@ -0,0 +1,43 @@
+using WD7UVN_HFT_2023241.Models;
+using System.ComponentModel;
+using System.Windows;
+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace WD7UVN_SzTGUI_2023242.Client.WPF.ViewModels
+{
+    public class MainWindowViewModel : ObservableRecipient
+    {
+        private string errorMessage;
+
+        public string ErrorMessage
+        {
+            get { return errorMessage; }
+            set { SetProperty(ref errorMessage, value); }
+        }
+
+        public RestCollection<Service> Services { get; set; }
+        public RestCollection<MaintainerTeam> MaintainerTeams { get; set; }
+        public RestCollection<Customer> Customers { get; set; }
+        public RestCollection<Employee> Employees { get; set; }
+
+        public static bool IsInDesignMode
+        {
+            get
+            {
+                var prop = DesignerProperties.IsInDesignModeProperty;
+                return (bool)DependencyPropertyDescriptor.FromProperty(prop, typeof(FrameworkElement)).Metadata.DefaultValue;
+            }
+        }
+
+        public MainWindowViewModel()
+        {
+            if (!IsInDesignMode)
+            {
+                Services = new RestCollection<Service>("http://localhost:62005/", "Service", "hub");
+                Employees = new RestCollection<Employee>("http://localhost:62005/", "Employee", "hub");
+                MaintainerTeams = new RestCollection<MaintainerTeam>("http://localhost:62005/", "MaintainerTeam", "hub");
+                Customers = new RestCollection<Customer>("http://localhost:62005/", "Customer", "hub");
+            }
+        }
+    }
+}