This is a very simple case of saving a list of settings to Silverlight Isolated storage during an Application Exit event:
IsolatedStorageSettings.ApplicationSettings[key] = settings;
When the application restarted, the ApplicationSettings were empty. I did not received any errors until an explicit save was added:
IsolatedStorageSettings.ApplicationSettings[key] = settings;
IsolatedStorageSettings.ApplicationSettings.Save();
The save is normally not needed since the application settings are saved implicitly by the IsolatedStorageSettings class. After the save was added, the following helpful exception was thrown:
The collection data contract type ‘System.Collections.Generic.List`1[[… ColumnSetting, … ‘ cannot be deserialized because it does not have a public parameterless constructor. Adding a public parameterless constructor will fix this error. …
Well, (duh) it turns out the problem had nothing to do with Isolated Storage. Rather, it was the inadvertent omission of the public constructor that was causing the problem.
Jersey Dude 