FeatureLayer Update method does not work

Question

When I try and run the update method on all feature layers in the map I get an error that the object in null.  when i debug this is not the case and all of the information looks correct. I am I using this method right?

FeatureLayer f = new FeatureLayer();
foreach (Layer _layer in MyMap.Layers)
{
   if (_layer is FeatureLayer)
   {
       f = _layer as FeatureLayer;
       f.Update();
    }
 }

BrianGustafson · Answer

The issue was that the layer was never initialized.  When I only run update on initialized layers it works.  I am using version 2.1 of the API so I don't know if this will work with 2.2.

Thanks.

DominiqueBroux · Answer

I am wondering now if the issue is that the layer is never initialized because that tab was never opened. Could that be the case?

That's a good point.
After some research, I found that this may have been fixed in 2.2. Which version are you using?
 
With 2.1, the workaround might be to test if(layer.IsInitialized) before calling Update.

BrianGustafson · Answer

I included the code to create one of the layers below. However, I had an idea. The application I am creating is a tabbed application. So if a tab with a map on it is not opened is the layer ever initialized? I am wondering now if the issue is that the layer is never initialized because that tab was never opened. Could that be the case? OBJECTID COMMENTS GLOBALID