add icomparer for version

Author: Lamond Lu

DynamicPlugins.Core/DomainModel/PluginPackage.cs

@@ -51,7 +51,7 @@ public List<IMigration> GetAllMigrations(string connectionString)
 
             assembly = null;
 
-            return migrations;
+            return migrations.OrderBy(p => p.Version).ToList();
         }
 
         public void Initialize(Stream stream)

DynamicPlugins.Core/DomainModel/Version.cs

@@ -4,15 +4,55 @@
 
 namespace DynamicPlugins.Core.DomainModel
 {
-    public class Version
+    public class Version : IComparer<Version>
     {
         public Version(string versionNumber)
         {
             this.VersionNumber = versionNumber;
         }
 
+        public int PrimaryVersion
+        {
+            get
+            {
+                return Convert.ToInt32(this.VersionNumber.Split('.')[0]);
+            }
+        }
+
+        public int SecondaryVersion
+        {
+            get
+            {
+                return Convert.ToInt32(this.VersionNumber.Split('.')[1]);
+            }
+        }
+
+        public int MinorVersion
+        {
+            get
+            {
+                return Convert.ToInt32(this.VersionNumber.Split('.')[2]);
+            }
+        }
+
         public string VersionNumber { get; set; }
 
+        public int Compare(Version x, Version y)
+        {
+            if (x.PrimaryVersion > y.PrimaryVersion || (x.PrimaryVersion == y.PrimaryVersion && x.SecondaryVersion > y.SecondaryVersion) || (x.PrimaryVersion == y.PrimaryVersion && x.SecondaryVersion == y.SecondaryVersion && x.MinorVersion > y.MinorVersion))
+            {
+                return 1;
+            }
+            else if (x.PrimaryVersion == y.PrimaryVersion && x.SecondaryVersion == y.SecondaryVersion && x.MinorVersion == y.MinorVersion)
+            {
+                return 0;
+            }
+            else
+            {
+                return -1;
+            }
+        }
+
         public static bool operator ==(Version left, Version right)
         {
             if (left == null || right == null)