Issue with CollectionEditorExtensions

[garetharevans]

Hello

There appears to be a bug in GetCollectionItemIndex in your CollectionEditorExtensions.

I found I was getting a newly created GUID after postback for the second item in the collection, after a server side validation failure. The symptom was that validation messages were not being displayed due to the ID in model state not matching the re-rendered id in the partial view. You appear to be adding previous indices into a different queue from the one passed to other views in HttpContext.

It seems that your code

previousIndices = new Queue<string>();
HttpContext.Current.Items[fieldKey] = new Queue<string>();

should actually be

previousIndices = new Queue<string>();
HttpContext.Current.Items[fieldKey] = previousIndices;

Thanks