1 files changed, 32 insertions, 5 deletions
diff --git a/MediaBrowser.Model/Configuration/BaseApplicationConfiguration.cs b/MediaBrowser.Model/Configuration/BaseApplicationConfiguration.cs
index 6a1a0f090..57759a7d3 100644
--- a/MediaBrowser.Model/Configuration/BaseApplicationConfiguration.cs
+++ b/MediaBrowser.Model/Configuration/BaseApplicationConfiguration.cs
@@ -1,3 +1,6 @@
+using System;
+using System.Xml.Serialization;
+
 namespace MediaBrowser.Model.Configuration
 {
     /// <summary>
@@ -8,7 +11,15 @@ namespace MediaBrowser.Model.Configuration
     public class BaseApplicationConfiguration
     {
         /// <summary>
-        /// The number of days we should retain log files
+        /// Initializes a new instance of the <see cref="BaseApplicationConfiguration" /> class.
+        /// </summary>
+        public BaseApplicationConfiguration()
+        {
+            LogFileRetentionDays = 3;
+        }
+
+        /// <summary>
+        /// Gets or sets the number of days we should retain log files.
         /// </summary>
         /// <value>The log file retention days.</value>
         public int LogFileRetentionDays { get; set; }
@@ -23,14 +34,30 @@ namespace MediaBrowser.Model.Configuration
         /// Gets or sets the cache path.
         /// </summary>
         /// <value>The cache path.</value>
-        public string CachePath { get; set; }
+        public string? CachePath { get; set; }
 
         /// <summary>
-        /// Initializes a new instance of the <see cref="BaseApplicationConfiguration" /> class.
+        /// Gets or sets the last known version that was ran using the configuration.
         /// </summary>
-        public BaseApplicationConfiguration()
+        /// <value>The version from previous run.</value>
+        [XmlIgnore]
+        public Version? PreviousVersion { get; set; }
+
+        /// <summary>
+        /// Gets or sets the stringified PreviousVersion to be stored/loaded,
+        /// because System.Version itself isn't xml-serializable.
+        /// </summary>
+        /// <value>String value of PreviousVersion.</value>
+        public string? PreviousVersionStr
         {
-            LogFileRetentionDays = 3;
+            get => PreviousVersion?.ToString();
+            set
+            {
+                if (Version.TryParse(value, out var version))
+                {
+                    PreviousVersion = version;
+                }
+            }
         }
     }
 }