fix a crashing bug

System.ArgumentException thrown by Path.GetFullPath

BililiveRecorder.WPF/Pages/RootPage.xaml.cs

@@ -15,6 +15,7 @@ using BililiveRecorder.WPF.Models;
 using CommandLine;
 using ModernWpf.Controls;
 using ModernWpf.Media.Animation;
+using NLog;
 using Path = System.IO.Path;
 
 namespace BililiveRecorder.WPF.Pages
@@ -24,6 +25,8 @@ namespace BililiveRecorder.WPF.Pages
     /// </summary>
     public partial class RootPage : UserControl
     {
+        private static readonly Logger logger = LogManager.GetCurrentClassLogger();
+
         private readonly Dictionary<string, Type> PageMap = new Dictionary<string, Type>();
         private readonly string lastdir_path = Path.Combine(Path.GetDirectoryName(typeof(RootPage).Assembly.Location), "lastdir.txt");
         private readonly NavigationTransitionInfo transitionInfo = new DrillInNavigationTransitionInfo();
@@ -68,15 +71,19 @@ namespace BililiveRecorder.WPF.Pages
 
         private async void RootPage_Loaded(object sender, RoutedEventArgs e)
         {
-            bool first_time = true;
-
             var recorder = RootScope.Resolve<IRecorder>();
+            var first_time = true;
             var error = string.Empty;
             string path;
             while (true)
+            {
+                try
                 {
                     CommandLineOption commandLineOption = null;
                     if (first_time)
+                    {
+                        // while 循环第一次运行时检查命令行参数
+                        try
                         {
                             first_time = false;
                             Parser.Default
@@ -85,34 +92,54 @@ namespace BililiveRecorder.WPF.Pages
 
                             if (!string.IsNullOrWhiteSpace(commandLineOption?.WorkDirectory))
                             {
+                                // 如果有参数直接跳到检查路径
                                 path = Path.GetFullPath(commandLineOption.WorkDirectory);
-                        goto check_path;
+                            }
+                            else
+                            {
+                                // 无命令行参数
+                                continue;
                             }
                         }
-
+                        catch (Exception)
-                string lastdir = string.Empty;
+                        {
+                            // 出错直接重新来，不显示 error
+                            continue;
+                        }
+                    }
+                    else
+                    {
+                        // 尝试读取上次选择的路径
+                        var lastdir = string.Empty;
                         try
                         {
                             if (File.Exists(lastdir_path))
-                    {
                                 lastdir = File.ReadAllText(lastdir_path).Replace("\r", "").Replace("\n", "").Trim();
                         }
-                }
                         catch (Exception) { }
-                var w = new WorkDirectorySelectorDialog
+
+                        // 显示路径选择界面
+                        var dialog = new WorkDirectorySelectorDialog
                         {
                             Error = error,
                             Path = lastdir
                         };
-                var result = await w.ShowAsync();
+                        
-                if (result != ContentDialogResult.Primary)
+                        if (await dialog.ShowAsync() != ContentDialogResult.Primary)
                         {
                             (Application.Current.MainWindow as NewMainWindow).CloseWithoutConfirmAction();
                             return;
                         }
 
-                path = Path.GetFullPath(w.Path);
+                        try
-            check_path:
+                        { path = Path.GetFullPath(dialog.Path); }
+                        catch (Exception)
+                        {
+                            error = "不支持该路径";
+                            continue;
+                        }
+                    }
+
                     var config = Path.Combine(path, "config.json");
 
                     if (!Directory.Exists(path))
@@ -130,18 +157,17 @@ namespace BililiveRecorder.WPF.Pages
                         continue;
                     }
 
+                    // 已经选定工作目录
+
+                    // 如果不是从命令行参数传入的路径，写入 lastdir_path 记录
                     try
-                {
+                    { if (string.IsNullOrWhiteSpace(commandLineOption?.WorkDirectory)) File.WriteAllText(lastdir_path, path); }
-                    if (string.IsNullOrWhiteSpace(commandLineOption?.WorkDirectory))
-                    {
-                        File.WriteAllText(lastdir_path, path);
-                    }
-                }
                     catch (Exception) { }
 
                     // 检查已经在同目录运行的其他进程
                     if (SingleInstance.CheckMutex(path))
                     {
+                        // 无已经在同目录运行的进程
                         if (recorder.Initialize(path))
                         {
                             Model.Recorder = recorder;
@@ -164,10 +190,18 @@ namespace BililiveRecorder.WPF.Pages
                     }
                     else
                     {
+                        // 有已经在其他目录运行的进程，已经通知该进程，本进程退出
                         (Application.Current.MainWindow as NewMainWindow).CloseWithoutConfirmAction();
                         return;
                     }
                 }
+                catch (Exception ex)
+                {
+                    error = "发生了未知错误";
+                    logger.Error(ex, "选择工作目录时发生了未知错误");
+                    continue;
+                }
+            }
         }
 
         private void NavigationView_SelectionChanged(NavigationView sender, NavigationViewSelectionChangedEventArgs args)