I came across some strange behavior of the Sharepoint Object Model (OM) when adding a new column (field) to the default view of an existing list.
Surprisingly (or not 
) the following code snippet doesn’t seem to work:
list.DefaultView.ViewFields.Add(ACCOUNT);
list.DefaultView.Update();
But what you say if the following one is working:
SPView defaultView = list.DefaultView;
defaultView.ViewFields.Add(ACCOUNT);
defaultView.Update();
Let’s take a closer look in debugger to see what happens when running this code:
The first print-screen displays the current properties of the default view object:
The following image display the properties of the defaultView object :
Looks like the SPView defaultView = list.DefaultView code line makes a copy of the default view. The defaultView has different fields after this step:
Update method seems to synchronize the information with the real view object (tried to see Update method with the reflactor but it is obfuscated):
