REST CRUD

MyFirstMauiApp/UseRestService/AppShell.xaml

@@ -3,12 +3,11 @@
     x:Class="UseRestService.AppShell"
     xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
     xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
-    xmlns:local="clr-namespace:UseRestService"
+    xmlns:local="clr-namespace:UseRestService.Pages"
     Shell.FlyoutBehavior="Disabled">
 
     <ShellContent
-        Title="Home"
-        ContentTemplate="{DataTemplate local:MainPage}"
-        Route="MainPage" />
+        ContentTemplate="{DataTemplate local:PartsPage}"
+        Route="listparts" />
 
 </Shell>

MyFirstMauiApp/UseRestService/AppShell.xaml.cs

@@ -1,10 +1,14 @@
-namespace UseRestService
+using UseRestService.Pages;
+
+namespace UseRestService
 {
     public partial class AppShell : Shell
     {
         public AppShell()
         {
             InitializeComponent();
+
+            Routing.RegisterRoute("addpart", typeof(AddPartPage));
         }
     }
 }

MyFirstMauiApp/UseRestService/Data/PartManager.cs

@@ -1,7 +1,9 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Net.Http.Json;
 using System.Text;
+using System.Text.Json;
 using System.Threading.Tasks;
 
 namespace UseRestService.Data
@@ -9,34 +11,99 @@ namespace UseRestService.Data
     public static class PartsManager
     {
         // TODO: Add fields for BaseAddress, Url, and authorizationKey
-        static readonly string BaseAddress = "URL GOES HERE";
+        static readonly string BaseAddress = "https://mslearnpartsserver425916999.azurewebsites.net";
         static readonly string Url = $"{BaseAddress}/api/";
 
         static HttpClient client;
 
+        static string authorizationKey;
+
         private static async Task<HttpClient> GetClient()
         {
-            throw new NotImplementedException();
+            if (client != null)
+                return client;
+
+            client = new HttpClient();
+
+            if (string.IsNullOrEmpty(authorizationKey))
+            {
+                authorizationKey = await client.GetStringAsync($"{Url}login");
+                authorizationKey = JsonSerializer.Deserialize<string>(authorizationKey);
+            }
+
+            client.DefaultRequestHeaders.Add("Authorization", authorizationKey);
+            client.DefaultRequestHeaders.Add("Accept", "application/json");
+
+            return client;
         }
 
         public static async Task<IEnumerable<Part>> GetAll()
         {
-            throw new NotImplementedException();
+            if (Connectivity.Current.NetworkAccess != NetworkAccess.Internet)
+                return new List<Part>();
+
+            var client = await GetClient();
+            string result = await client.GetStringAsync($"{Url}parts");
+
+            return JsonSerializer.Deserialize<List<Part>>(result, new JsonSerializerOptions
+            {
+                PropertyNameCaseInsensitive = true,
+            });
         }
 
         public static async Task<Part> Add(string partName, string supplier, string partType)
         {
-            throw new NotImplementedException();
+            if (Connectivity.Current.NetworkAccess != NetworkAccess.Internet)
+                return new Part();
+
+            var part = new Part()
+            {
+                PartName = partName,
+                Suppliers = new List<string>(new[] { supplier }),
+                PartID = string.Empty,
+                PartType = partType,
+                PartAvailableDate = DateTime.Now.Date
+            };
+
+            var msg = new HttpRequestMessage(HttpMethod.Post, $"{Url}parts");
+            msg.Content = JsonContent.Create<Part>(part);
+
+            var response = await client.SendAsync(msg);
+            response.EnsureSuccessStatusCode();
+
+            var returnedJson = await response.Content.ReadAsStringAsync();
+
+            var insertedPart = JsonSerializer.Deserialize<Part>(returnedJson, new JsonSerializerOptions
+            {
+                PropertyNameCaseInsensitive = true,
+            });
+
+            return insertedPart;
         }
 
         public static async Task Update(Part part)
         {
-            throw new NotImplementedException();
+            if (Connectivity.Current.NetworkAccess != NetworkAccess.Internet)
+                return;
+
+            HttpRequestMessage msg = new(HttpMethod.Put, $"{Url}parts/{part.PartID}");
+            msg.Content = JsonContent.Create<Part>(part);
+
+            var client = await GetClient();
+            var response = await client.SendAsync(msg);
+            response.EnsureSuccessStatusCode();
         }
 
         public static async Task Delete(string partID)
         {
-            throw new NotImplementedException();
+            if (Connectivity.Current.NetworkAccess != NetworkAccess.Internet)
+                return;
+
+            HttpRequestMessage msg = new(HttpMethod.Delete, $"{Url}parts/{partID}");
+
+            var client = await GetClient();
+            var response = await client.SendAsync(msg);
+            response.EnsureSuccessStatusCode();
         }
     }
 }

MyFirstMauiApp/UseRestService/Pages/AddPartPage.xaml

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             x:Class="UseRestService.Pages.AddPartPage"
+             xmlns:viewmodel="clr-namespace:UseRestService.ViewModels"
+             x:DataType="viewmodel:AddPartViewModel"
+             Title="Edit Part">
+
+    <Grid RowDefinitions="*,Auto" ColumnDefinitions="*,*,*" ColumnSpacing="5" Padding="10">
+        <TableView Intent="Data" Grid.Row="0" Grid.ColumnSpan="3">
+            <TableRoot>
+                <TableSection Title="Part Info">
+                    <EntryCell Label="Part ID" Text="{Binding PartID}" IsEnabled="False" />
+                    <EntryCell Label="Part Name" Text="{Binding PartName}" />
+                    <EntryCell Label="Part Type" Text="{Binding PartType}" />
+                    <EntryCell Label="Supplier" Text="{Binding Suppliers}" />
+                </TableSection>
+            </TableRoot>
+        </TableView>
+
+        <Button Text="Save" Grid.Row="1" Grid.Column="0" Command="{Binding SaveDataCommand}" Margin="20,0"/>
+        <Button Text="Delete" Grid.Row="1" Grid.Column="1" Command="{Binding DeletePartCommand}"/>
+        <Button Text="Cancel" Grid.Row="1" Grid.Column="2" Command="{Binding DoneEditingCommand}" Margin="20,0"/>
+    </Grid>
+    
+</ContentPage>

MyFirstMauiApp/UseRestService/Pages/AddPartPage.xaml.cs

@@ -0,0 +1,35 @@
+using UseRestService.Data;
+using UseRestService.ViewModels;
+
+namespace UseRestService.Pages;
+
+[QueryProperty("PartToDisplay", "part")]
+public partial class AddPartPage : ContentPage
+{
+    AddPartViewModel viewModel;
+    public AddPartPage()
+    {
+        InitializeComponent();
+
+        viewModel = new AddPartViewModel();
+        BindingContext = viewModel;
+    }
+
+    Part _partToDisplay;
+    public Part PartToDisplay
+    {
+        get => _partToDisplay;
+        set
+        {
+            if (_partToDisplay == value)
+                return;
+
+            _partToDisplay = value;
+
+            viewModel.PartID = _partToDisplay.PartID;
+            viewModel.PartName = _partToDisplay.PartName;
+            viewModel.Suppliers = _partToDisplay.SupplierString;
+            viewModel.PartType = _partToDisplay.PartType;
+        }
+    }
+}

MyFirstMauiApp/UseRestService/Pages/PartsPage.xaml

@@ -2,11 +2,33 @@
 <ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
              xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
              x:Class="UseRestService.Pages.PartsPage"
-             Title="PartsPage">
-    <VerticalStackLayout>
-        <Label 
-            Text="Welcome to .NET MAUI!"
-            VerticalOptions="Center" 
-            HorizontalOptions="Center" />
+             Title="Part List"
+             xmlns:viewModel="clr-namespace:UseRestService.ViewModels"
+             xmlns:data="clr-namespace:UseRestService.Data"
+             x:DataType="viewModel:PartsViewModel">
+
+    <Grid RowDefinitions="Auto,*" ColumnDefinitions="*">
+        <Button Grid.Row="0" Grid.Column="0" Text="Add New Part" Margin="20, 10, 20, 10" Command="{Binding AddNewPartCommand}"/>
+        <RefreshView Grid.Row="1" Grid.Column="0" IsRefreshing="{Binding IsRefreshing}" x:Name="refreshView"
+                     Command="{Binding LoadDataCommand}">
+            <CollectionView  Margin="30,20,30,30"
+                             ItemsSource="{Binding Parts}"                             
+                             SelectedItem="{Binding SelectedPart, Mode=TwoWay}"
+                             SelectionChangedCommand="{Binding PartSelectedCommand}"
+                             SelectionMode="Single">
+                <CollectionView.ItemsLayout>
+                    <LinearItemsLayout Orientation="Vertical" ItemSpacing="20" />
+                </CollectionView.ItemsLayout>
+                <CollectionView.ItemTemplate>
+                    <DataTemplate x:DataType="data:Part">
+                        <VerticalStackLayout Padding="15,10" Margin="10,5,10,5">
+                            <Label Text="{Binding PartID, StringFormat='ID: {0}'}" FontSize="Title" Margin="0,0,0,20"/>
+                            <Label Text="{Binding PartName, StringFormat='Part Name: {0}'}"/>
+                            <Label Text="{Binding PartType, StringFormat='Part Type: {0}'}"/>
                         </VerticalStackLayout>
+                    </DataTemplate>
+                </CollectionView.ItemTemplate>
+            </CollectionView>
+        </RefreshView>
+    </Grid>
 </ContentPage>

MyFirstMauiApp/UseRestService/Pages/PartsPage.xaml.cs

@@ -1,3 +1,5 @@
+using UseRestService.ViewModels;
+
 namespace UseRestService.Pages;
 
 public partial class PartsPage : ContentPage
@@ -5,5 +7,6 @@ public partial class PartsPage : ContentPage
 	public PartsPage()
 	{
 		InitializeComponent();
+		BindingContext = new PartsViewModel();
 	}
 }

MyFirstMauiApp/UseRestService/UseRestService.csproj

@@ -54,6 +54,9 @@
 	</ItemGroup>
 
 	<ItemGroup>
+	  <MauiXaml Update="Pages\AddPartPage.xaml">
+	    <Generator>MSBuild:Compile</Generator>
+	  </MauiXaml>
 	  <MauiXaml Update="Pages\PartsPage.xaml">
 	    <Generator>MSBuild:Compile</Generator>
 	  </MauiXaml>

MyFirstMauiApp/UseRestService/ViewModels/AddPartViewModel.cs

@@ -0,0 +1,89 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using CommunityToolkit.Mvvm.Messaging;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using UseRestService.Data;
+
+namespace UseRestService.ViewModels
+{
+    public partial class AddPartViewModel : ObservableObject
+    {
+        [ObservableProperty]
+        string _partID;
+
+        [ObservableProperty]
+        string _partName;
+
+        [ObservableProperty]
+        string _suppliers;
+
+        [ObservableProperty]
+        string _partType;
+
+        public AddPartViewModel()
+        {
+        }
+
+        [RelayCommand]
+        async Task SaveData()
+        {
+            if (string.IsNullOrWhiteSpace(PartID))
+                await InsertPart();
+            else
+                await UpdatePart();
+        }
+
+
+        [RelayCommand]
+        async Task InsertPart()
+        {
+            await PartsManager.Add(PartName, Suppliers, PartType);
+
+            WeakReferenceMessenger.Default.Send(new RefreshMessage(true));
+
+            await Shell.Current.GoToAsync("..");
+        }
+
+
+        [RelayCommand]
+        async Task UpdatePart()
+        {
+            Part partToSave = new()
+            {
+                PartID = PartID,
+                PartName = PartName,
+                PartType = PartType,
+                Suppliers = Suppliers.Split(",").ToList()
+            };
+
+            await PartsManager.Update(partToSave);
+
+            WeakReferenceMessenger.Default.Send(new RefreshMessage(true));
+
+            await Shell.Current.GoToAsync("..");
+        }
+
+        [RelayCommand]
+        async Task DeletePart()
+        {
+            if (string.IsNullOrWhiteSpace(PartID))
+                return;
+
+            await PartsManager.Delete(PartID);
+
+            WeakReferenceMessenger.Default.Send(new RefreshMessage(true));
+
+            await Shell.Current.GoToAsync("..");
+        }
+
+        [RelayCommand]
+        async Task DoneEditing()
+        {
+            await Shell.Current.GoToAsync("..");
+        }
+    }
+}

MyFirstMauiApp/UseRestService/ViewModels/PartsViewModel.cs

@@ -1,13 +1,92 @@
 using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using CommunityToolkit.Mvvm.Messaging;
 using System;
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
+using UseRestService.Data;
 
 namespace UseRestService.ViewModels
 {
-    internal class PartsViewModel : ObservableObject
+    internal partial class PartsViewModel : ObservableObject
     {
+        [ObservableProperty]
+        ObservableCollection<Part> _parts;
+
+        [ObservableProperty]
+        bool _isRefreshing = false;
+
+        [ObservableProperty]
+        bool _isBusy = false;
+
+        [ObservableProperty]
+        Part _selectedPart;
+
+        public PartsViewModel()
+        {
+            _parts = new ObservableCollection<Part>();
+
+            WeakReferenceMessenger.Default.Register<RefreshMessage>(this, async (r, m) =>
+            {
+                await LoadData();
+            });
+
+            Task.Run(LoadData);
+        }
+
+        [RelayCommand]
+        async Task PartSelected()
+        {
+            if (SelectedPart == null)
+                return;
+
+            var navigationParameter = new Dictionary<string, object>()
+            {
+                { "part", SelectedPart }
+            };
+
+            await Shell.Current.GoToAsync("addpart", navigationParameter);
+
+            MainThread.BeginInvokeOnMainThread(() => SelectedPart = null);
+        }
+
+        [RelayCommand]
+        async Task LoadData()
+        {
+            if (IsBusy)
+                return;
+
+            try
+            {
+                IsRefreshing = true;
+                IsBusy = true;
+
+                var partsCollection = await PartsManager.GetAll();
+
+                MainThread.BeginInvokeOnMainThread(() =>
+                {
+                    Parts.Clear();
+
+                    foreach (Part part in partsCollection)
+                    {
+                        Parts.Add(part);
+                    }
+                });
+            }
+            finally
+            {
+                IsRefreshing = false;
+                IsBusy = false;
+            }
+        }
+
+        [RelayCommand]
+        async Task AddNewPart()
+        {
+            await Shell.Current.GoToAsync("addpart");
+        }
     }
 }