Use 'field' keyword

Author: jnm2

YouTube download tool.sln

@@ -1,13 +1,14 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio Version 16
-VisualStudioVersion = 16.0.29209.152
+# Visual Studio Version 17
+VisualStudioVersion = 17.14.35806.103
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "YouTubeDownloadTool", "src\YouTubeDownloadTool\YouTubeDownloadTool.csproj", "{3F15C158-ADA8-4817-A109-23DC63E4D82A}"
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{9DB62BA4-D4BC-42EB-9B45-C008DD51C4E3}"
 	ProjectSection(SolutionItems) = preProject
 		.editorconfig = .editorconfig
+		global.json = global.json
 	EndProjectSection
 EndProject
 Global

global.json

@@ -0,0 +1,7 @@
+{
+  "sdk": {
+    "version": "9.0.100",
+    "rollForward": "latestMajor",
+    "allowPrerelease": false
+  }
+}

src/YouTubeDownloadTool/Command.cs

@@ -6,7 +6,6 @@ namespace YouTubeDownloadTool;
 public sealed class Command : ICommand
 {
     private readonly Action action;
-    private bool canExecute = true;
 
     public Command(Action action)
     {
@@ -20,18 +19,18 @@ public Command(Func<Task> asyncAction)
 
     public bool CanExecute
     {
-        get => canExecute;
+        get;
         set
         {
-            if (canExecute == value) return;
-            canExecute = value;
+            if (field == value) return;
+            field = value;
             CanExecuteChanged?.Invoke(this, EventArgs.Empty);
         }
-    }
+    } = true;
 
     public event EventHandler? CanExecuteChanged;
 
-    bool ICommand.CanExecute(object? parameter) => canExecute;
+    bool ICommand.CanExecute(object? parameter) => CanExecute;
 
     void ICommand.Execute(object? parameter) => action.Invoke();
 }

src/YouTubeDownloadTool/MainViewModel.cs

@@ -11,26 +11,19 @@ public sealed class MainViewModel : ObservableObject
     private readonly IDownloadDataAccess dataAccess;
     private readonly Action<(string Message, bool IsError)> showNotification;
 
-    private string? downloadUrl;
-    public string? DownloadUrl { get => downloadUrl; set => Set(ref downloadUrl, value); }
+    public string? DownloadUrl { get; set => Set(ref field, value); }
 
-    private bool audioOnly;
-    public bool AudioOnly { get => audioOnly; set => Set(ref audioOnly, value); }
+    public bool AudioOnly { get; set => Set(ref field, value); }
 
-    private string? destinationFolder;
-    public string? DestinationFolder { get => destinationFolder; set => Set(ref destinationFolder, value); }
+    public string? DestinationFolder { get; set => Set(ref field, value); }
 
-    private double? progressFraction;
-    public double? ProgressFraction { get => progressFraction; set => Set(ref progressFraction, value); }
+    public double? ProgressFraction { get; set => Set(ref field, value); }
 
-    private bool isEditable = true;
-    public bool IsEditable { get => isEditable; set => Set(ref isEditable, value); }
+    public bool IsEditable { get; set => Set(ref field, value); } = true;
 
-    private bool isProgressBarVisible;
-    public bool IsProgressBarVisible { get => isProgressBarVisible; set => Set(ref isProgressBarVisible, value); }
+    public bool IsProgressBarVisible { get; set => Set(ref field, value); }
 
-    private string? status;
-    public string? Status { get => status; set => Set(ref status, value); }
+    public string? Status { get; set => Set(ref field, value); }
 
     public Command Start { get; }
 
@@ -41,9 +34,9 @@ public MainViewModel(IDownloadDataAccess dataAccess, Action<(string Message, boo
         this.dataAccess = dataAccess;
         this.showNotification = showNotification;
 
-        audioOnly = Properties.Settings.Default.AudioOnly;
+        AudioOnly = Properties.Settings.Default.AudioOnly;
 
-        destinationFolder = Directory.Exists(Properties.Settings.Default.DestinationFolder)
+        DestinationFolder = Directory.Exists(Properties.Settings.Default.DestinationFolder)
             ? Properties.Settings.Default.DestinationFolder
             : Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory);
 

src/YouTubeDownloadTool/ToolLease.cs

@@ -4,7 +4,6 @@ namespace YouTubeDownloadTool;
 
 public sealed class ToolLease : IDisposable
 {
-    private readonly string filePath;
     private IDisposable? lease;
 
     public ToolLease(string version, string filePath, IDisposable lease)
@@ -16,15 +15,15 @@ public ToolLease(string version, string filePath, IDisposable lease)
             throw new ArgumentException("File path must be fully qualified.", nameof(filePath));
 
         Version = version;
-        this.filePath = filePath;
+        FilePath = filePath;
         this.lease = lease ?? throw new ArgumentNullException(nameof(lease));
     }
 
     public string Version { get; }
 
     public string FilePath => Volatile.Read(ref lease) is null
         ? throw new ObjectDisposedException(nameof(ToolLease))
-        : filePath;
+        : field;
 
     public void Dispose()
     {

src/YouTubeDownloadTool/YouTubeDownloadTool.csproj

@@ -15,6 +15,8 @@
     <PublishSingleFile>true</PublishSingleFile>
     <IncludeNativeLibrariesForSelfExtract>true</IncludeNativeLibrariesForSelfExtract>
 
+    <LangVersion>preview</LangVersion>
+
     <TreatWarningsAsErrors Condition="'$(Configuration)' != 'Debug'">true</TreatWarningsAsErrors>
     <EnforceCodeStyleInBuild>true</EnforceCodeStyleInBuild>
   </PropertyGroup>