New Post: Remove View from AllActiveRegion does not work.

Hi,

Based on my understanding, this kind of problems seems to appear when modifying a collection of items, while iterating over it using aforeach statement. In this case, you are iterating over the Views collection of the region using a foreach and modifying it inside by removing a view from the region.

This is mentioned in the following MSDN article:

• Foreach statement (C#)

A quick approach to avoid this kind of problems is to "find" what elements you want to remove (in this case a view) from the collection and remove them outside theforeach statement. For example:

var views = this.regionManager.Regions[RegionNames.MyRegion].Views;object viewToRemove = null;foreach (var view in views)
{var myView = (IMyView)view;if (myView.ViewSortHint == this.ID)
    {// We found the view we want to remove
        viewToRemove = myView;
    }
}if(viewToRemove != null)
{// We remove the view outside the foreachthis.regionManager.Regions[RegionNames.MyRegion].Remove(viewToRemove);
}

Another approach could be to use a for loop instead of a foreach loop.

I hope you find this useful,

Damian Cherubini
http://blogs.southworks.net/dcherubini