Added taskId to trangaTask and parentTaskId to DownloadChapterTask as unique identifier to attach ChildTasks to ParentTask on deserialization.

Tranga/TaskManager.cs

@@ -428,6 +428,16 @@ public class TaskManager
             this._allTasks = JsonConvert.DeserializeObject<HashSet<TrangaTask>>(buffer, new JsonSerializerSettings() { Converters = { new TrangaTask.TrangaTaskJsonConverter() } })!;
         }
 
+        foreach (TrangaTask task in this._allTasks.Where(task => task.GetType() == typeof(DownloadChapterTask)))
+        {
+            DownloadChapterTask dcTask = (DownloadChapterTask)task;
+            IEnumerable<TrangaTask> dncTasks = this._allTasks.Where(pTask => pTask.GetType() == typeof(DownloadNewChaptersTask));
+            DownloadNewChaptersTask? parentTask = (DownloadNewChaptersTask?)dncTasks.FirstOrDefault(pTask => pTask.taskId.Equals(dcTask.parentTaskId));
+            dcTask.parentTask = parentTask;
+            parentTask?.AddChildTask(dcTask);
+        }
+            
+
         if (File.Exists(settings.knownPublicationsPath))
         {
             logger?.WriteLine(this.GetType().ToString(), $"Importing known publications from {settings.knownPublicationsPath}");

Tranga/TrangaTask.cs

@@ -1,4 +1,5 @@
-using System.Text.Json.Serialization;
+using System.Globalization;
+using System.Text.Json.Serialization;
 using Logging;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
@@ -20,6 +21,7 @@ public abstract class TrangaTask
     public TimeSpan reoccurrence { get; }
     public DateTime lastExecuted { get; set; }
     public Task task { get; }
+    public string taskId { get; set; }
     [Newtonsoft.Json.JsonIgnore]public ExecutionState state { get; set; }
     [Newtonsoft.Json.JsonIgnore]public double progress { get; protected set; }
     [Newtonsoft.Json.JsonIgnore]public DateTime nextExecution => lastExecuted.Add(reoccurrence);
@@ -50,6 +52,7 @@ public abstract class TrangaTask
         this.progress = 0f;
         this.executionStarted = DateTime.Now;
         this.lastChange = DateTime.MaxValue;
+        this.taskId = Convert.ToBase64String(System.Text.Encoding.ASCII.GetBytes(this.executionStarted.ToString(CultureInfo.InvariantCulture)));
     }
 
     public double IncrementProgress(double amount)

Tranga/TrangaTasks/DownloadChapterTask.cs

@@ -9,7 +9,9 @@ public class DownloadChapterTask : TrangaTask
     public Publication publication { get; }
     public string language { get; }
     public Chapter chapter { get; }
-    [JsonIgnore]public DownloadNewChaptersTask? parentTask { get; init; }
+    [JsonIgnore]public DownloadNewChaptersTask? parentTask { get; set; }
+    public string? parentTaskId { get; set; }
+
     
     public DownloadChapterTask(Task task, string connectorName, Publication publication, Chapter chapter, string language = "en", DownloadNewChaptersTask? parentTask = null) : base(task, TimeSpan.Zero)
     {
@@ -18,6 +20,7 @@ public class DownloadChapterTask : TrangaTask
         this.publication = publication;
         this.language = language;
         this.parentTask = parentTask;
+        this.parentTaskId = parentTask?.taskId;
     }
 
     protected override void ExecuteTask(TaskManager taskManager, Logger? logger, CancellationToken? cancellationToken = null)

Tranga/TrangaTasks/DownloadNewChaptersTask.cs

@@ -63,6 +63,11 @@ public class DownloadNewChaptersTask : TrangaTask
         this.childTasks.Add(newTask);
     }
 
+    public void AddChildTask(DownloadChapterTask childTask)
+    {
+        this.childTasks.Add(childTask);
+    }
+    
     /// <summary>
     /// Updates the available Chapters of a Publication
     /// </summary>