implement CompareTo

Pilz.Updating/AppVersion.cs

@@ -2,7 +2,7 @@
 
 namespace Pilz.Updating;
 
-public class AppVersion(Version version, int build, Channels channel)
+public class AppVersion(Version version, int build, Channels channel) : IComparable, IComparable<AppVersion>
 {
     // P r o p e r t i e s
 
@@ -81,6 +81,42 @@ public class AppVersion(Version version, int build, Channels channel)
         return new AppVersion(version, build, channel);
     }
 
+    // C o m p a r e
+
+    public int CompareTo(object appVersion)
+    {
+        return CompareTo(appVersion as AppVersion);
+    }
+
+    public int CompareTo(AppVersion appVersion)
+    {
+        if (appVersion is null)
+            return 1;
+
+        if (Version != appVersion.Version)
+        {
+            if (Version > appVersion.Version)
+                return 1;
+            return -1;
+        }
+
+        if (Channel != appVersion.Channel)
+        {
+            if (Channel < appVersion.Channel)
+                return 1;
+            return -1;
+        }
+
+        if (Build != appVersion.Build)
+        {
+            if (Build > appVersion.Build)
+                return 1;
+            return -1;
+        }
+
+        return 0;
+    }
+
     // O p e r a t o r s
 
     public static bool operator >(AppVersion a, AppVersion b)