Implementing of viewModel handling for UI

AdventureWorks.EntityLayer/EntityClasses/User.cs

@@ -1,6 +1,6 @@
 using Common.Library;
 
-namespace AdventureWorks.EntityLayer.EntityClasses;
+namespace AdventureWorks.EntityLayer;
 
 public class User : EntityBase
 {

AdventureWorks.MAUI.sln

@@ -9,6 +9,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AdventureWorks.EntityLayer"
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Common.Library", "Common.Library\Common.Library.csproj", "{FEDB6441-2564-4DD5-A3C9-1B2F0A761BB4}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AdventureWorks.ViewModelLayer", "AdventureWorks.ViewModelLayer\AdventureWorks.ViewModelLayer.csproj", "{3E3C685B-CA66-4E12-83BC-B872BC5FD933}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -28,6 +30,10 @@ Global
 		{FEDB6441-2564-4DD5-A3C9-1B2F0A761BB4}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{FEDB6441-2564-4DD5-A3C9-1B2F0A761BB4}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{FEDB6441-2564-4DD5-A3C9-1B2F0A761BB4}.Release|Any CPU.Build.0 = Release|Any CPU
+		{3E3C685B-CA66-4E12-83BC-B872BC5FD933}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{3E3C685B-CA66-4E12-83BC-B872BC5FD933}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{3E3C685B-CA66-4E12-83BC-B872BC5FD933}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{3E3C685B-CA66-4E12-83BC-B872BC5FD933}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

AdventureWorks.MAUI/AdventureWorks.MAUI.csproj

@@ -66,6 +66,7 @@
 
 	<ItemGroup>
 	  <ProjectReference Include="..\AdventureWorks.EntityLayer\AdventureWorks.EntityLayer.csproj" />
+	  <ProjectReference Include="..\AdventureWorks.ViewModelLayer\AdventureWorks.ViewModelLayer.csproj" />
 	  <ProjectReference Include="..\Common.Library\Common.Library.csproj" />
 	</ItemGroup>
 

AdventureWorks.MAUI/Views/UserDetailView.xaml

@@ -4,13 +4,13 @@
              x:Class="AdventureWorks.MAUI.Views.UserDetailView"
              xmlns:partial="clr-namespace:AdventureWorks.MAUI.ViewsPartial"
              xmlns:converters="clr-namespace:AdventureWorks.MAUI.Converters"
-             xmlns:vm="clr-namespace:AdventureWorks.EntityLayer.EntityClasses;assembly=AdventureWorks.EntityLayer"
+             xmlns:vm="clr-namespace:AdventureWorks.ViewModelLayer;assembly=AdventureWorks.ViewModelLayer"
-             x:DataType="vm:User"
+             x:DataType="vm:UserViewModel"
              Title="User Information">
 
     <ContentPage.Resources>
         <converters:InvertedBoolConverter x:Key="invertedBoolean" />
-        <vm:User x:Key="viewModel"
+        <!--<vm:User x:Key="viewModel"
                  LoginId="JohnSmith123"
                  FirstName="John222"
                  LastName="Smith"
@@ -24,11 +24,10 @@
                  IsEnrolledInHSA="False"
                  IsActive="True"
                  BirthDate="10-03-1975"
-                 />
+                 />-->
     </ContentPage.Resources>
     
-    <Border Style="{StaticResource Border.Page}"
+    <Border Style="{StaticResource Border.Page}" >
-            BindingContext="{StaticResource viewModel}" >
         <ScrollView>
             <Grid RowDefinitions="Auto, Auto, Auto, Auto, Auto, Auto, Auto, Auto, Auto,Auto, Auto, Auto , Auto"
           ColumnDefinitions="Auto, *"
@@ -45,7 +44,7 @@
 
                 <VerticalStackLayout Grid.Row="1"
                              Grid.Column="1">
-                    <Entry Text="{Binding LoginId}" 
+                    <Entry Text="{Binding UserObject.LoginId}" 
                    Placeholder="Please use a combination of letters and numbers."/>
                     <Label FontSize="Micro"
                    Text="Please use a combination of letters and numbers." />
@@ -54,17 +53,17 @@
                Text="First Name" />
                 <Entry Grid.Row="2"
                Grid.Column="1"
-               Text="{Binding FirstName}"/>
+               Text="{Binding UserObject.FirstName}"/>
                 <Label Grid.Row="3"
                Text="Last Name" />
                 <Entry Grid.Row="3"
                Grid.Column="1"
-               Text="{Binding LastName}"/>
+               Text="{Binding UserObject.LastName}"/>
                 <Label Grid.Row="4"
                Text="Email Address" />
                 <Entry Grid.Row="4"
                Grid.Column="1"
-               Text="{Binding Email}"/>
+               Text="{Binding UserObject.Email}"/>
                 <Label Grid.Row="5" Text="Is Enrolled ?"/>
 
                 <FlexLayout Grid.Row="5"
@@ -73,19 +72,19 @@
                     Direction="Row">
                     <HorizontalStackLayout>
                         <Label Text="401k?"/>
-                        <CheckBox IsChecked="{Binding IsEnrolledIn401k}"/>
+                        <CheckBox IsChecked="{Binding UserObject.IsEnrolledIn401k}"/>
                     </HorizontalStackLayout>
                     <HorizontalStackLayout >
                         <Label Text="Flex Time?"/>
-                        <CheckBox x:Name="FlexTime" IsChecked="{Binding IsEnrolledInFlexTime}"/>
+                        <CheckBox x:Name="FlexTime" IsChecked="{Binding UserObject.IsEnrolledInFlexTime}"/>
                     </HorizontalStackLayout>
                     <HorizontalStackLayout >
                         <Label Text="Health Care?"/>
-                        <CheckBox IsChecked="{Binding IsEnrolledInHealthCare}"/>
+                        <CheckBox IsChecked="{Binding UserObject.IsEnrolledInHealthCare}"/>
                     </HorizontalStackLayout>
                     <HorizontalStackLayout >
                         <Label Text="Health Savings Account?"/>
-                        <CheckBox IsChecked="{Binding IsEnrolledInHSA}"/>
+                        <CheckBox IsChecked="{Binding UserObject.IsEnrolledInHSA}"/>
                     </HorizontalStackLayout>
                 </FlexLayout>
 
@@ -93,7 +92,7 @@
                        Text="Still Employed"/>
                 <Switch Grid.Row="6"
                        Grid.Column="1"
-                        IsToggled="{Binding IsActive}"/>
+                        IsToggled="{Binding UserObject.IsActive}"/>
                 <Label Text="Employee Type"
                        Grid.Row="7"/>
                 <FlexLayout Grid.Row="7"
@@ -103,12 +102,12 @@
                     <HorizontalStackLayout>
                         <Label Text="Full-Time"/>
                         <RadioButton x:Name="FullTime"
-                                     IsChecked="{Binding IsFullTime}"
+                                     IsChecked="{Binding UserObject.IsFullTime}"
                                      GroupName="EmployeeType"/>
                     </HorizontalStackLayout>
                     <HorizontalStackLayout>
                         <Label Text="Part-Time"/>
-                        <RadioButton GroupName="EmployeeType" IsChecked="{Binding IsFullTime, Converter={StaticResource invertedBoolean}}"/>
+                        <RadioButton GroupName="EmployeeType" IsChecked="{Binding UserObject.IsFullTime, Converter={StaticResource invertedBoolean}}"/>
                     </HorizontalStackLayout>
                 </FlexLayout>
 
@@ -116,14 +115,14 @@
                        Grid.Row="8"/>
                 <DatePicker Grid.Row="8"
                               Grid.Column="1"
-                            Date="{Binding BirthDate}"
+                            Date="{Binding UserObject.BirthDate}"
                               HorizontalOptions="Start"/>
                 <Label Text="Start Time"
                        Grid.Row="9"/>
                 <TimePicker Grid.Row="9"
                             Grid.Column="1"
-                            Time="{Binding StartTime}"
+                            Time="{Binding UserObject.StartTime}"
-                            IsEnabled="{Binding IsFullTime, Converter={StaticResource invertedBoolean}}"/>
+                            IsEnabled="{Binding UserObject.IsFullTime, Converter={StaticResource invertedBoolean}}"/>
 
                 <Label Text="Phone"
                        Grid.Row="10"/>
@@ -133,11 +132,11 @@
                             Direction="Row">
                     <HorizontalStackLayout>
                         <Entry MinimumWidthRequest="120"
-                               Text="{Binding Phone}"/>
+                               Text="{Binding UserObject.Phone}"/>
                     </HorizontalStackLayout>
                     <HorizontalStackLayout>
-                        <Picker ItemsSource="{StaticResource phoneTypes}"
+                        <Picker ItemsSource="{StaticResource UserObject.phoneTypes}"
-                                SelectedItem="{Binding PhoneType}"/>
+                                SelectedItem="{Binding UserObject.PhoneType}"/>
                     </HorizontalStackLayout>    
                 </FlexLayout>
                 

AdventureWorks.MAUI/Views/UserDetailView.xaml.cs

@@ -1,5 +1,4 @@
-using AdventureWorks.EntityLayer.EntityClasses;
+using AdventureWorks.ViewModelLayer;
-
 namespace AdventureWorks.MAUI.Views;
 
 public partial class UserDetailView : ContentPage
@@ -7,20 +6,20 @@ public partial class UserDetailView : ContentPage
     public UserDetailView()
     {
         InitializeComponent();
-        UserObject = (User)this.Resources["viewModel"];
+
-        UserObject.LoginId = "jkzxck0q94375";
     }
 
-    public User UserObject { get; set; }
+    public UserViewModel ViewModel { get; set; }
 
     protected override void OnAppearing()
     {
         base.OnAppearing();
 
-        UserObject.LoginId = "PeterPiper384";
+        ViewModel = new();
-        UserObject.FirstName = "Peter";
+
-        UserObject.LastName = "Piper";
+        BindingContext = ViewModel;
-        UserObject.Email = "peter@piper.com";
+
+        ViewModel.Get(1); // Assuming you want to get the user with ID 1
     }
     private void SaveButton_Clicked(object sender, EventArgs e)
     {

AdventureWorks.ViewModelLayer/AdventureWorks.ViewModelLayer.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\AdventureWorks.EntityLayer\AdventureWorks.EntityLayer.csproj" />
+    <ProjectReference Include="..\Common.Library\Common.Library.csproj" />
+  </ItemGroup>
+
+</Project>

AdventureWorks.ViewModelLayer/ViewModelClasses/UserViewModel.cs

@@ -0,0 +1,81 @@
+using AdventureWorks.EntityLayer;
+using Common.Library;
+using System.Collections.ObjectModel;
+
+namespace AdventureWorks.ViewModelLayer;
+
+public class UserViewModel : ViewModelBase
+{
+    #region Private Variables
+    private User? _UserObject = new();
+    #endregion
+
+    #region public Properties
+
+    public User? UserObject
+    {
+        get { return _UserObject; }
+        set
+        {
+            _UserObject = value;
+            RaisePropertyChanged(nameof(UserObject));
+        }
+
+    }
+    #endregion
+
+    #region Get Method
+    public ObservableCollection<User> Get()
+    {
+        return new();
+    }
+
+    #endregion
+
+    #region Get(id) Method
+    public User? Get(int id)
+    {
+        try
+        {
+            UserObject = new User
+            {
+                UserId = id,
+                LoginId = "SallyJones615",
+                FirstName = "Sally",
+                LastName = "Jones",
+                Email = "sally@jones.com",
+                Password = "password123",
+                Phone = "555-1234",
+                PhoneType = "Mobile",
+                IsFullTime = true,
+                IsEnrolledIn401k = false,
+                IsEnrolledInFlexTime = false,
+                IsEnrolledInHealthCare = true,
+                IsEnrolledInHSA = false,
+                IsActive = true,
+                BirthDate = Convert.ToDateTime("1975-11-04"),
+                StartTime = new TimeSpan(8, 0, 0)
+
+            };
+        }
+        catch (Exception ex)
+        {
+            System.Diagnostics.Debug.WriteLine($"Error in Get method: {ex.Message}");
+        }
+
+        return UserObject;
+    }
+
+    #endregion
+
+
+    #region Save Method
+    public virtual bool Save()
+    {
+        System.Diagnostics.Debugger.Break();
+        return true;
+    }
+    #endregion
+
+
+}

Common.Library/BaseClasses/ViewModelBase.cs

@@ -0,0 +1,6 @@
+
+namespace Common.Library;
+
+public class ViewModelBase : CommonBase
+{
+}