enable nullables

Pilz.Updating.Client/Pilz.Updating.Client.csproj

@@ -3,6 +3,7 @@
   <PropertyGroup>
     <TargetFrameworks>net8.0</TargetFrameworks>
     <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
   </PropertyGroup>
   
   <PropertyGroup>

Pilz.Updating.Client/UpdateClient.cs

@@ -6,7 +6,7 @@ public class UpdateClient(string updateUrl, AppVersion currentVersion, Channels
 {
     // E v e n t s
 
-    public event UpdateClientStatusChangedEventHandler OnStatusChanged;
+    public event UpdateClientStatusChangedEventHandler? OnStatusChanged;
 
     // F i e l d s
 
@@ -18,8 +18,8 @@ public class UpdateClient(string updateUrl, AppVersion currentVersion, Channels
     public string UpdateUrl { get; private set; } = updateUrl;
     public AppVersion CurrentVersion { get; private set; } = currentVersion;
     public Channels MinimumChannel { get; private set; } = (Channels)Math.Max((int)minimumChannel, (int)currentVersion.Channel);
-    public UpdateInfo UpdateInfo { get; private set; } = null;
-    public UpdatePackageInfo UpdatePackageInfo { get; private set; } = null;
+    public UpdateInfo? UpdateInfo { get; private set; }
+    public UpdatePackageInfo? UpdatePackageInfo { get; private set; }
     public string HostApplicationPath { get; set; } = string.Empty;
     public string ApplicationName { get; set; } = string.Empty;
     public bool InstallAsAdmin { get; set; } = false;
@@ -51,7 +51,7 @@ public class UpdateClient(string updateUrl, AppVersion currentVersion, Channels
     {
         var latestVersion = await CheckForUpdate();
 
-        if (HasUpdates)
+        if (HasUpdates && latestVersion is not null)
             await UpdateInteractive(latestVersion);
     }
 
@@ -63,14 +63,14 @@ public class UpdateClient(string updateUrl, AppVersion currentVersion, Channels
 
     // F e a t u r e s
 
-    public async Task<UpdateInfo> GetUpdateInfo()
+    public async Task<UpdateInfo?> GetUpdateInfo()
     {
         string str = await WebClient.GetStringAsync(UpdateUrl);
         var info = UpdateInfo.Parse(str);
         return info;
     }
 
-    private async Task<UpdatePackageInfo> CheckForUpdate()
+    private async Task<UpdatePackageInfo?> CheckForUpdate()
     {
         RaiseStatusChanged(UpdateStatus.Searching, UpdateStatusEvent.PreEvent);
 
@@ -82,29 +82,26 @@ public class UpdateClient(string updateUrl, AppVersion currentVersion, Channels
         return CheckForUpdate(UpdateInfo);
     }
 
-    private UpdatePackageInfo CheckForUpdate(UpdateInfo updateInfo)
+    private UpdatePackageInfo? CheckForUpdate(UpdateInfo updateInfo)
     {
-        UpdatePackageInfo foundPkgInfo = null;
         var latestVersion = CurrentVersion;
 
         foreach (UpdatePackageInfo pkgInfo in updateInfo.Packages)
         {
             if (pkgInfo.Version.Channel <= MinimumChannel && pkgInfo.Version > latestVersion)
             {
-                foundPkgInfo = pkgInfo;
+                UpdatePackageInfo = pkgInfo;
                 latestVersion = pkgInfo.Version;
             }
         }
 
-        UpdatePackageInfo = foundPkgInfo;
-
         if (!RaiseStatusChanged(UpdateStatus.Searching, UpdateStatusEvent.PostEvent, true))
         {
             UpdatePackageInfo = null;
             return null;
         }
 
-        return foundPkgInfo;
+        return UpdatePackageInfo;
     }
 
     public async Task<bool> DownloadPackageAsync(UpdatePackageInfo package)
@@ -171,7 +168,7 @@ public class UpdateClient(string updateUrl, AppVersion currentVersion, Channels
         RaiseStatusChanged(UpdateStatus.Copying, UpdateStatusEvent.PreEvent);
         var dataPathDir = new DirectoryInfo(dataPath);
         var destDir = new DirectoryInfo(HostApplicationPath);
-        General.CopyFiles(dataPathDir, destDir);
+        Utils.CopyFiles(dataPathDir, destDir);
         RaiseStatusChanged(UpdateStatus.Copying, UpdateStatusEvent.PostEvent);
 
         // Delete Package