Add annotationResult and put them into json

Azaion.Annotator/DTO/FormState.cs

@@ -1,4 +1,5 @@
-using System.IO;
+using System.Globalization;
+using System.IO;
 using System.Windows;
 
 namespace Azaion.Annotator.DTO;
@@ -12,6 +13,26 @@ public class FormState
     public string VideoName => Path.GetFileNameWithoutExtension(CurrentFile).Replace(" ", "");
     public TimeSpan CurrentVideoLength { get; set; }
     public int CurrentVolume { get; set; } = 100;
-
+    public List<AnnotationResult> AnnotationResults { get; set; } = [];
+    
     public string GetTimeName(TimeSpan ts) => $"{VideoName}_{ts:hmmssf}";
+
+    public TimeSpan? GetTime(string name)
+    {
+        var timeStr = name.Split("_").LastOrDefault();
+        if (string.IsNullOrEmpty(timeStr))
+            return null;
+        
+        try
+        {
+            //For some reason, TimeSpan.ParseExact doesn't work on every platform.
+            return new TimeSpan(
+                days: 0,
+                hours: int.Parse(timeStr[0..1]),
+                minutes: int.Parse(timeStr[1..3]),
+                seconds: int.Parse(timeStr[3..5]),
+                milliseconds: int.Parse(timeStr[5..6]) * 100);
+        }
+        catch (Exception e) {  return null;  }
+    }
 }