changed.对启动器重构的尝试

LanMountainDesktop.Launcher/Update/InstallCheckpointStore.cs

@@ -0,0 +1,49 @@
+using System.Text.Json;
+using LanMountainDesktop.Launcher.Models;
+
+namespace LanMountainDesktop.Launcher.Update;
+
+internal sealed class InstallCheckpointStore(UpdateEnginePaths paths)
+{
+    public InstallCheckpoint? Load()
+    {
+        if (!File.Exists(paths.InstallCheckpointPath))
+        {
+            return null;
+        }
+
+        try
+        {
+            var text = File.ReadAllText(paths.InstallCheckpointPath);
+            if (string.IsNullOrWhiteSpace(text))
+            {
+                return null;
+            }
+
+            return JsonSerializer.Deserialize(text, AppJsonContext.Default.InstallCheckpoint);
+        }
+        catch
+        {
+            return null;
+        }
+    }
+
+    public void Save(InstallCheckpoint checkpoint)
+    {
+        File.WriteAllText(paths.InstallCheckpointPath, JsonSerializer.Serialize(checkpoint, AppJsonContext.Default.InstallCheckpoint));
+    }
+
+    public void Delete()
+    {
+        try
+        {
+            if (File.Exists(paths.InstallCheckpointPath))
+            {
+                File.Delete(paths.InstallCheckpointPath);
+            }
+        }
+        catch
+        {
+        }
+    }
+}