Swap out Newtonsoft.Json for XML, as it wasn't working right.

RhinoReminds/ClientListener.cs

@@ -6,7 +6,6 @@ using System.Text;
 using System.Text.RegularExpressions;
 using System.Threading;
 using System.Threading.Tasks;
-using Newtonsoft.Json;
 using S22.Xmpp;
 using S22.Xmpp.Client;
 using S22.Xmpp.Im;
@@ -23,7 +22,7 @@ namespace RhinoReminds
 		public string Hostname => Jid.Split('@')[1];
 		private readonly string password;
 
-		public string ReminderFilePath { get; set; } = "./Reminders.json";
+		public string ReminderFilePath { get; set; } = "./reminders.xml";
 		private ReminderList reminderList = new ReminderList();
 
 		private XmppClient client;
@@ -39,7 +38,7 @@ namespace RhinoReminds
 			if (File.Exists(ReminderFilePath))
 			{
 				Console.WriteLine($"[Rhino/Startup] Loading reminders list from {ReminderFilePath}");
-				reminderList = JsonConvert.DeserializeObject<ReminderList>(File.ReadAllText(ReminderFilePath));
+				reminderList = ReminderList.FromXmlFile(ReminderFilePath);
 			}
 
 			client = new XmppClient(Hostname, Username, password);

RhinoReminds/Program.cs

@@ -9,7 +9,7 @@ namespace RhinoReminds
 {
 	public class ProgramSettings
 	{
-		public string Filepath = "./reminders.json";
+		public string Filepath = "./reminders.xml";
 		public string Jid = null;
 
 		public string Password = null;

RhinoReminds/Reminder.cs

@@ -1,5 +1,6 @@
 using System;
-using Newtonsoft.Json;
+using System.Net;
+using System.Xml;
 using S22.Xmpp;
 
 namespace RhinoReminds
@@ -9,7 +10,6 @@ namespace RhinoReminds
 	{
 		public int Id { get; }
 		public string Jid { get; }
-		[JsonIgnore]
 		public Jid JidObj => new Jid(Jid);
 		public DateTime Time { get; }
 		public string Message { get; }
@@ -26,5 +26,47 @@ namespace RhinoReminds
 		{
 			return $"[Reminder Id={Id}, Jid={Jid}, Time={Time}, Message={Message}";
 		}
+
+		#region XML
+
+
+		public void WriteToXml(XmlWriter xml)
+		{
+			xml.WriteStartElement("Reminder");
+
+			xml.WriteElementString("Id", Id.ToString());
+			xml.WriteElementString("Jid", Jid);
+			xml.WriteElementString("Time", Time.ToString());
+			xml.WriteElementString("Message", WebUtility.HtmlEncode(Message));
+
+			xml.WriteEndElement();
+		}
+
+		public static Reminder FromXml(XmlNode xml)
+		{
+			int id = -1; string jid = string.Empty, message = string.Empty; DateTime dateTime = DateTime.Now;
+
+			foreach (XmlNode subNode in xml.ChildNodes) {
+				switch (subNode.Name) {
+					case "Id":
+						id = int.Parse(subNode.InnerText);
+						break;
+					case "Jid":
+						jid = subNode.InnerText;
+						break;
+					case "Time":
+						dateTime = DateTime.Parse(subNode.InnerText);
+						break;
+					case "Message":
+						message = WebUtility.HtmlDecode(subNode.InnerText);
+						break;
+				}
+			}
+
+			return new Reminder(id, jid, dateTime, message);
+		}
+
+
+		#endregion
 	}
 }

RhinoReminds/ReminderList.cs

@@ -1,21 +1,19 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
-using Newtonsoft.Json;
+using System.Linq;
+using System.Xml;
 using S22.Xmpp;
 
 namespace RhinoReminds
 {
 	public delegate void OnReminderListUpdateHandler(object sender, Reminder newReminder);
 
-	[JsonObject(MemberSerialization.OptIn)]
 	public class ReminderList
 	{
-		[JsonProperty]
-		public int NextId { get; private set; } = 0;
-		private object saveLock = new object();
+		private int nextId = 0;
+		private readonly object saveLock = new object();
 
-		[JsonProperty]
 		public SortedList<DateTime, Reminder> Reminders = new SortedList<DateTime, Reminder>();
 
 		public event OnReminderListUpdateHandler OnReminderListUpdate;
@@ -26,7 +24,7 @@ namespace RhinoReminds
 		}
 
 		public Reminder CreateReminder(Jid inJid, DateTime time, string message) {
-			Reminder result = new Reminder(NextId++, $"{inJid.Node}@{inJid.Domain}", time, message);
+			Reminder result = new Reminder(nextId++, $"{inJid.Node}@{inJid.Domain}", time, message);
 			Console.WriteLine($"[Rhino/ReminderList] Created reminder {result}");
 			Reminders.Add(time, result);
 			OnReminderListUpdate(this, result);
@@ -38,7 +36,24 @@ namespace RhinoReminds
 			// Make sure that the reminder thread doesn't try to save the reminders at the exact same time
 			// we receive a request for a new reminder
 			lock (saveLock) { // FUTURE: We could go lockless here with some work, but it's not worth it for the teeny chance & low overhead 
-				File.WriteAllText(filename, JsonConvert.SerializeObject(this));
+				XmlWriter xml = XmlWriter.Create(
+					filename,
+					new XmlWriterSettings() { Indent = true }
+				);
+
+				xml.WriteStartDocument();
+				xml.WriteStartElement("ReminderList");
+
+				xml.WriteElementString("NextId", nextId.ToString());
+
+				xml.WriteStartElement("Reminders");
+				foreach (Reminder nextReminder in Reminders.Values)
+					nextReminder.WriteToXml(xml);
+				xml.WriteEndElement();
+
+				xml.WriteEndElement();
+				xml.WriteEndDocument();
+				xml.Close();
 			}
 		}
 
@@ -53,5 +68,20 @@ namespace RhinoReminds
 		public void DeleteReminder(Reminder nextReminder) {
 			Reminders.Remove(nextReminder.Time);
 		}
+
+		public static ReminderList FromXmlFile(string filepath)
+		{
+			XmlDocument xml = new XmlDocument();
+			xml.Load(filepath);
+
+			ReminderList result = new ReminderList();
+			result.nextId = int.Parse(xml.GetElementsByTagName("NextId")[0].InnerText);
+			foreach (XmlNode reminderXML in xml.GetElementsByTagName("Reminders")[0].ChildNodes) {
+				Reminder nextReminder = Reminder.FromXml(reminderXML);
+				result.Reminders.Add(nextReminder.Time, nextReminder);
+			}
+
+			return result;
+		}
 	}
 }

RhinoReminds/RhinoReminds.csproj

@@ -34,9 +34,6 @@
     <Reference Include="S22.Xmpp">
       <HintPath>..\packages\S22.Xmpp.1.0.0.0\lib\net45\S22.Xmpp.dll</HintPath>
     </Reference>
-    <Reference Include="Newtonsoft.Json">
-      <HintPath>..\packages\Newtonsoft.Json.11.0.2\lib\net45\Newtonsoft.Json.dll</HintPath>
-    </Reference>
     <Reference Include="mscorlib" />
     <Reference Include="Microsoft.Recognizers.Definitions">
       <HintPath>..\packages\Microsoft.Recognizers.Text.1.1.2\lib\net462\Microsoft.Recognizers.Definitions.dll</HintPath>
@@ -59,6 +56,7 @@
     <Reference Include="System.ValueTuple">
       <HintPath>..\packages\System.ValueTuple.4.5.0\lib\net47\System.ValueTuple.dll</HintPath>
     </Reference>
+    <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
     <Compile Include="Program.cs" />

RhinoReminds/packages.config

@@ -4,7 +4,6 @@
   <package id="Microsoft.Recognizers.Text.DateTime" version="1.1.2" targetFramework="net47" />
   <package id="Microsoft.Recognizers.Text.Number" version="1.1.2" targetFramework="net47" />
   <package id="Microsoft.Recognizers.Text.NumberWithUnit" version="1.1.2" targetFramework="net47" />
-  <package id="Newtonsoft.Json" version="11.0.2" targetFramework="net47" />
   <package id="S22.Xmpp" version="1.0.0.0" targetFramework="net47" />
   <package id="System.Collections.Immutable" version="1.5.0" targetFramework="net47" />
   <package id="System.ValueTuple" version="4.5.0" targetFramework="net47" />