DI 注入文件系统，web平台不支持System.IO.File

Notes.Android/FileService.cs

@@ -0,0 +1,53 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+
+namespace Notes.Android;
+
+class FileService : IFileService
+{
+    public string Combine(string args0, string args1)
+    {
+        return Path.Combine(args0, args1);
+    }
+
+    public string GetRandomFileName()
+    {
+        return Path.GetRandomFileName();
+    }
+
+    public IEnumerable<string> EnumerateFiles(string path, string patten)
+    {
+        return Directory.EnumerateFiles(path, patten);
+    }
+
+    public string GetFileName(string filename)
+    {
+        return Path.GetFileName(filename);
+    }
+
+    public string ReadAllText(string filename)
+    {
+        return File.ReadAllText(filename);
+    }
+
+    public DateTime GetLastWriteTime(string filename)
+    {
+        return File.GetLastWriteTime(filename);
+    }
+
+    public bool ExistsFile(string filename)
+    {
+        return File.Exists(filename);
+    }
+
+    public void Delete(string path)
+    {
+        File.Delete(path);
+    }
+
+    public void WriteAllText(string path, string text)
+    {
+        File.WriteAllText(path, text);
+    }
+}

Notes.Android/MainActivity.cs

@@ -3,6 +3,7 @@ using Android.Content.PM;
 using Avalonia;
 using Avalonia.Android;
 using Avalonia.ReactiveUI;
+using Notes.ViewModels;
 
 namespace Notes.Android;
 
@@ -16,6 +17,10 @@ public class MainActivity : AvaloniaMainActivity<App>
 {
     protected override AppBuilder CustomizeAppBuilder(AppBuilder builder)
     {
+        
+        var services = new Services();
+        services.Register<IFileService>(new FileService());
+        App.services = services;
         return base.CustomizeAppBuilder(builder)
             .WithInterFont()
             .UseReactiveUI();

Notes.Browser/Notes.Browser.csproj

@@ -4,6 +4,9 @@
     <RuntimeIdentifier>browser-wasm</RuntimeIdentifier>
     <WasmMainJSPath>AppBundle\main.js</WasmMainJSPath>
     <OutputType>Exe</OutputType>
+    <WasmAllowUndefinedSymbols>true</WasmAllowUndefinedSymbols>
+    <MSBuildDebugEngine>1</MSBuildDebugEngine>
+    <WasmBuildNative>true</WasmBuildNative>
   </PropertyGroup>
 
   <ItemGroup>

Notes.Desktop/FileService.cs

@@ -0,0 +1,53 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+
+namespace Notes.Desktop;
+
+class FileService: IFileService
+{
+    public string Combine(string args0, string args1)
+    {
+        return Path.Combine(args0, args1);
+    }
+
+    public string GetRandomFileName()
+    {
+        return Path.GetRandomFileName();
+    }
+
+    public IEnumerable<string> EnumerateFiles(string path, string patten)
+    {
+        return Directory.EnumerateFiles(path,patten);
+    }
+
+    public string GetFileName(string filename)
+    {
+        return Path.GetFileName(filename);
+    }
+
+    public string ReadAllText(string filename)
+    {
+        return File.ReadAllText(filename);
+    }
+
+    public DateTime GetLastWriteTime(string filename)
+    {
+        return File.GetLastWriteTime(filename);
+    }
+
+    public bool ExistsFile(string filename)
+    {
+        return File.Exists(filename);
+    }
+
+    public void Delete(string path)
+    {
+        File.Delete(path);
+    }
+
+    public void WriteAllText(string path, string text)
+    {
+         File.WriteAllText(path,text);
+    }
+}

Notes.Desktop/Program.cs

@@ -1,6 +1,7 @@
 using System;
 using Avalonia;
 using Avalonia.ReactiveUI;
+using Notes.ViewModels;
 
 namespace Notes.Desktop;
 
@@ -10,8 +11,14 @@ sealed class Program
     // SynchronizationContext-reliant code before AppMain is called: things aren't initialized
     // yet and stuff might break.
     [STAThread]
-    public static void Main(string[] args) => BuildAvaloniaApp()
-        .StartWithClassicDesktopLifetime(args);
+    public static void Main(string[] args)
+    {
+        var services = new Services();
+        services.Register<IFileService>(new FileService());
+        App.services = services;
+        BuildAvaloniaApp()
+            .StartWithClassicDesktopLifetime(args);
+    }
 
     // Avalonia configuration, don't remove; also used by visual designer.
     public static AppBuilder BuildAvaloniaApp()

Notes/App.axaml.cs

@@ -8,9 +8,12 @@ namespace Notes;
 
 public partial class App : Application
 {
+    public static IServices services { get; set; }
+
     public override void Initialize()
     {
         AvaloniaXamlLoader.Load(this);
+        FileSystem.fileService = services.GetSafeAs<IFileService>();
     }
 
     public override void OnFrameworkInitializationCompleted()

Notes/IFileService.cs

@@ -0,0 +1,67 @@
+using System;
+using System.Collections.Generic;
+
+namespace Notes;
+
+public interface IFileService
+{
+    string Combine(string args0, string args1);
+    string GetRandomFileName();
+    IEnumerable<string> EnumerateFiles(string path, string patten);
+    string GetFileName(string filename);
+    string ReadAllText(string filename);
+    DateTime GetLastWriteTime(string filename);
+    bool ExistsFile(string filename);
+    void Delete(string path);
+    void WriteAllText(string path, string text);
+}
+
+public static class FileSystem
+{
+    public static IFileService fileService;
+
+    public static string Combine(string args0, string args1)
+    {
+        return fileService.Combine(args0, args1);
+    }
+
+    public static string GetRandomFileName()
+    {
+        return fileService.GetRandomFileName();
+    }
+
+    public static IEnumerable<string> EnumerateFiles(string path, string patten)
+    {
+        return fileService.EnumerateFiles(path, patten);
+    }
+
+    public static string GetFileName(string filename)
+    {
+        return fileService.GetFileName(filename);
+    }
+
+    public static string ReadAllText(string filename)
+    {
+        return fileService.ReadAllText(filename);
+    }
+
+    public static DateTime GetLastWriteTime(string filename)
+    {
+        return fileService.GetLastWriteTime(filename);
+    }
+
+    public static bool ExistsFile(string filename)
+    {
+        return fileService.ExistsFile(filename);
+    }
+
+    public static void Delete(string filename)
+    {
+        fileService.Delete(filename);
+    }
+
+    public static void WriteAllText(string path, string text)
+    {
+        fileService.WriteAllText(path, text);
+    }
+}

Notes/Models/Note.cs

@@ -1,7 +1,6 @@
 
 using System;
 using System.Collections.Generic;
-using System.IO;
 using System.Linq;
 using Utils;
 
@@ -20,37 +19,37 @@ public class Note
     {
         get
         {
-            var appDataDirectory = Path.Combine(AppContext.BaseDirectory, "Data");
+            var appDataDirectory = FileSystem.Combine(AppContext.BaseDirectory, "Data");
             IOUtils.EnsureDirectory(appDataDirectory,false);
             return appDataDirectory;
         }
     }
     public Note()
     {
-        Filename = $"{Path.GetRandomFileName()}{Extension}";
+        Filename = $"{FileSystem.GetRandomFileName()}{Extension}";
         Date = DateTime.Now;
         Text = "";
     }
 
     public void Save() =>
-        File.WriteAllText(Path.Combine(AppDataDirectory, Filename), Text);
+        FileSystem.WriteAllText(FileSystem.Combine(AppDataDirectory, Filename), Text);
 
     public void Delete() =>
-        File.Delete(Path.Combine(AppDataDirectory, Filename));
+        FileSystem.Delete(FileSystem.Combine(AppDataDirectory, Filename));
 
     public static Note Load(string filename)
     {
-        filename = Path.Combine(AppDataDirectory, filename);
+        filename = FileSystem.Combine(AppDataDirectory, filename);
 
-        if (!File.Exists(filename))
-            throw new FileNotFoundException("Unable to find file on local storage.", filename);
+        if (!FileSystem.ExistsFile(filename))
+            throw new InvalidOperationException($"Unable to find file '{filename}' on local storage.");
 
         return
             new()
             {
-                Filename = Path.GetFileName(filename),
-                Text = File.ReadAllText(filename),
-                Date = File.GetLastWriteTime(filename)
+                Filename = FileSystem.GetFileName(filename),
+                Text = FileSystem.ReadAllText(filename),
+                Date = FileSystem.GetLastWriteTime(filename)
             };
     }
 
@@ -60,13 +59,13 @@ public class Note
         string appDataPath = AppDataDirectory;
 
         // Use Linq extensions to load the *.notes.txt files.
-        return Directory
+        return FileSystem
 
             // Select the file names from the directory
             .EnumerateFiles(appDataPath, "*.notes.txt")
 
             // Each file name is used to load a note
-            .Select(filename => Load(Path.GetFileName(filename)))
+            .Select(filename => Load(FileSystem.GetFileName(filename)))
 
             // With the final collection of notes, order them by date
             .OrderByDescending(note => note.Date);

Notes/ViewModels/AboutViewModel.cs

@@ -14,7 +14,7 @@ public partial class AboutViewModel:ViewModelBase
     [RelayCommand]
     public void ShowAllNotes()
     {
-        _services.GetAs<MainViewModel>().Navitation<AllNotesViewModel>(this._services);
+        _services.GetSafeAs<MainViewModel>().Navitation<AllNotesViewModel>(this._services);
     }
 
     [Obsolete("Used by designer",true)]

Notes/ViewModels/AllNotesViewModel.cs

@@ -26,7 +26,7 @@ public partial class AllNotesViewModel: ViewModelBase
     {
         var note = new Note();
         note.Filename = string.Empty;
-        this._services.GetAs<MainViewModel>().Navitation<NoteViewModel>(this._services,this,note);
+        this._services.GetSafeAs<MainViewModel>().Navitation<NoteViewModel>(this._services,this,note);
     }
     [RelayCommand]
     public void DeleteNote(ISelectionModel selectionModel)
@@ -43,7 +43,7 @@ public partial class AllNotesViewModel: ViewModelBase
     [RelayCommand]
     public void OpenAbout()
     {
-        this._services.GetAs<MainViewModel>().Navitation<AboutViewModel>(this._services);
+        this._services.GetSafeAs<MainViewModel>().Navitation<AboutViewModel>(this._services);
     }
 
     [Obsolete("Used by designer",true)]

Notes/ViewModels/IServices.cs

@@ -0,0 +1,8 @@
+namespace Notes.ViewModels;
+
+public interface IServices
+{
+    void Register<T>(T t);
+    T? Get<T>();
+    T GetSafeAs<T>();
+}

Notes/ViewModels/MainViewModel.cs

@@ -1,40 +1,10 @@
 using System;
-using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 using CommunityToolkit.Mvvm.ComponentModel;
 using Utils;
 
 namespace Notes.ViewModels;
 
-public interface IServices
-{
-    void Register<T>(T t);
-    T? Get<T>();
-    T GetAs<T>();
-}
-
-public sealed class Sevices:IServices
-{
-    private readonly Dictionary<Type, object?> map = new Dictionary<Type, object?>();
-    public void Register<T>(T t)
-    {
-        map.Add(typeof(T), t);
-    }
-
-    public T? Get<T>()
-    {
-        map.TryGetValue(typeof(T), out var t);
-        return (T?)t;
-    }
-
-    public T GetAs<T>()
-    {
-        T? foo = this.Get<T?>();
-        if (foo is { } t)
-            return t;
-        throw new InvalidOperationException($"Not find type '{typeof(T)}'");
-    }
-}
 public partial class MainViewModel:ViewModelBase
 {
     /// <summary>
@@ -47,7 +17,7 @@ public partial class MainViewModel:ViewModelBase
     
     public MainViewModel()
     {
-        _service = new Sevices();
+        _service = App.services;
         _service.Register(this);
         _contentViewModel = new AboutViewModel(_service);
     }

Notes/ViewModels/NoteViewModel.cs

@@ -51,13 +51,13 @@ public partial class NoteViewModel : ViewModelBase
 
     public void Back()
     {
-        _services.GetAs<MainViewModel>().Navitation<AllNotesViewModel>(this._services);
+        _services.GetSafeAs<MainViewModel>().Navitation<AllNotesViewModel>(this._services);
     }
 
     [RelayCommand]
     public void OpenNote()
     {
-        this._services.GetAs<MainViewModel>().Navitation<NoteViewModel>(this._services, this.AllNotesViewModel, this.Note);
+        this._services.GetSafeAs<MainViewModel>().Navitation<NoteViewModel>(this._services, this.AllNotesViewModel, this.Note);
     }
 
 

Notes/ViewModels/Services.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Collections.Generic;
+
+namespace Notes.ViewModels;
+
+public sealed class Services:IServices
+{
+    private readonly Dictionary<Type, object?> map = new Dictionary<Type, object?>();
+    public void Register<T>(T t)
+    {
+        this.map.Add(typeof(T), t);
+    }
+
+    public T? Get<T>()
+    {
+        this.map.TryGetValue(typeof(T), out var t);
+        return (T?)t;
+    }
+
+    public T GetSafeAs<T>()
+    {
+        T? foo = this.Get<T?>();
+        if (foo is { } t)
+            return t;
+        throw new InvalidOperationException($"Not find type '{typeof(T)}'");
+    }
+}

Notes/Views/MainView.axaml.cs

@@ -9,7 +9,6 @@ public partial class MainView : UserControl
 {
     public MainView()
     {
-        DataContext = new MainViewModel();
         InitializeComponent();
     }
 }