Fixed enumeration bug in EntityCollection

SubstrateCS/Source/EntityCollection.cs

@@ -188,12 +188,14 @@ namespace Substrate
         {
             private IEnumerator<TagNode> _enum;
 
+            private bool _next;
             private TypedEntity _cur;
 
             internal Enumerator (TagNodeList entities)
             {
                 _enum = entities.GetEnumerator();
                 _cur = null;
+                _next = false;
             }
 
             #region IEnumerator<Entity> Members
@@ -205,7 +207,7 @@ namespace Substrate
             {
                 get 
                 {
-                    if (_cur == null) {
+                    if (_next == false) {
                         throw new InvalidOperationException();
                     } 
                     return _cur;
@@ -240,10 +242,16 @@ namespace Substrate
             public bool MoveNext ()
             {
                 if (!_enum.MoveNext()) {
+                    _next = false;
                     return false;
                 }
 
                 _cur = EntityFactory.Create(_enum.Current.ToTagCompound());
+                if (_cur == null)
+                    _cur = EntityFactory.CreateGeneric(_enum.Current.ToTagCompound());
+
+                _next = true;
+
                 return true;
             }
 
@@ -253,6 +261,7 @@ namespace Substrate
             void System.Collections.IEnumerator.Reset ()
             {
                 _cur = null;
+                _next = false;
                 _enum.Reset();
             }
 

SubstrateCS/Source/EntityFactory.cs

@@ -52,6 +52,23 @@ namespace Substrate
             return te.LoadTreeSafe(tree);
         }
 
+        /// <summary>
+        /// Creates a new instance of a nonspecific <see cref="TypedEntity"/> object by NBT node.
+        /// </summary>
+        /// <param name="tree">A <see cref="TagNodeCompound"/> representing a single Entity, containing an 'id' field.</param>
+        /// <returns>A new instance of a <see cref="TypedEntity"/> object, or null if the entity is not typed.</returns>
+        public static TypedEntity CreateGeneric (TagNodeCompound tree)
+        {
+            TagNode type;
+            if (!tree.TryGetValue("id", out type)) {
+                return null;
+            }
+
+            TypedEntity te = new TypedEntity(type.ToTagString().Data);
+
+            return te.LoadTreeSafe(tree);
+        }
+
         /// <summary>
         /// Lookup a concrete <see cref="TypedEntity"/> type by name.
         /// </summary>