store last selected sln file

src/SharpIDE.Photino/Program.cs

@@ -1,7 +1,9 @@
+using System.Text.Json;
 using Microsoft.Build.Locator;
 using Microsoft.Extensions.DependencyInjection;
 using MudBlazor.Services;
 using Photino.Blazor;
+using SharpIDE.Photino.Models;
 using SharpIDE.Photino.Services;
 
 namespace SharpIDE.Photino;
@@ -16,6 +18,7 @@ public class Program
 		appBuilder.Services.AddLogging();//
 		appBuilder.Services.AddMudServices();
 		appBuilder.Services.AddSingleton<RefreshOpenFileService>();
+		appBuilder.Services.AddSingleton<AppState>();
 
 		appBuilder.RootComponents.Add<App>("app");
 
@@ -35,6 +38,21 @@ public class Program
 			refreshOpenFileService.InvokeRefreshOpenFile();
 		};
 
+		var configFilePath = GetConfigFilePath();
+
+		using var scope = app.Services.CreateScope();
+		var appState = scope.ServiceProvider.GetRequiredService<AppState>();
+
+		LoadAppStateFromConfigFile(appState, configFilePath);
+
+		app.MainWindow.RegisterWindowClosingHandler((sender, eventArgs) =>
+		{
+			using var stream = File.Create(configFilePath);
+			JsonSerializer.Serialize(stream, appState);
+			stream.Flush();
+			return false;
+		});
+
 		AppDomain.CurrentDomain.UnhandledException += (sender, error) =>
 		{
 			app.MainWindow.ShowMessage("Fatal exception", error.ExceptionObject.ToString());
@@ -45,4 +63,32 @@ public class Program
 
 		app.Run();
 	}
+
+	private static string GetConfigFilePath()
+	{
+		var folder = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
+		var configFolder = Path.Combine(folder, "SharpIDE.PhotinoConfig");
+		Directory.CreateDirectory(configFolder);
+		var configFilePath = Path.Combine(configFolder, "config.json");
+		return configFilePath;
+	}
+
+	private static void LoadAppStateFromConfigFile(AppState appState, string configFilePath)
+	{
+		if (File.Exists(configFilePath) is false)
+		{
+			File.WriteAllText(configFilePath, string.Empty);
+		}
+
+		using var stream = File.OpenRead(configFilePath);
+		if (stream.Length is 0)
+		{
+			return;
+		}
+		var deserializedAppState = JsonSerializer.Deserialize<AppState>(stream);
+		if (deserializedAppState is not null)
+		{
+			appState.SolutionFilePath = deserializedAppState.SolutionFilePath;
+		}
+	}
 }