GetAll windows done

WD7UVN_SzTGUI_2023242.Client.WPF/ViewModels/GetAllCustomersViewModel.cs

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+using WD7UVN_HFT_2023241.Models;
+using System.ComponentModel;
+using System.Windows;
+using CommunityToolkit.Mvvm.ComponentModel;
+using System.Windows.Input;
+using CommunityToolkit.Mvvm.Input;
+
+namespace WD7UVN_SzTGUI_2023242.Client.WPF.ViewModels
+{
+    public class GetAllCustomersViewModel : ObservableRecipient
+    {
+        public RestCollection<Customer> Customers { get; set; }
+
+        private Customer selectedCustomer;
+
+        public Customer SelectedCustomer
+        {
+            get { return selectedCustomer; }
+            set { SetProperty(ref selectedCustomer, value); (UpdateCustomerCommand as RelayCommand).NotifyCanExecuteChanged(); }
+        }
+
+        public ICommand UpdateCustomerCommand { get; set; }
+
+        public static bool IsInDesignMode
+        {
+            get
+            {
+                var prop = DesignerProperties.IsInDesignModeProperty;
+                return (bool)DependencyPropertyDescriptor.FromProperty(prop, typeof(FrameworkElement)).Metadata.DefaultValue;
+            }
+        }
+
+        public GetAllCustomersViewModel()
+        {
+            if (!IsInDesignMode)
+            {
+                Customers = new RestCollection<Customer>("http://localhost:5000/", "api/Customer", "hub");
+
+                UpdateCustomerCommand = new RelayCommand(() =>
+                {
+                    Customers.Update(SelectedCustomer);
+                },
+                () =>
+                {
+                    return SelectedCustomer != null;
+                });
+            }
+        }
+    }
+}