public static object GetPreviousSharedPropertyValue(this ApplicationSettingsBase settings, string propertyName, string previousExeConfigFilename)
{
SettingsProperty property = settings.Properties[propertyName];
if (property == null)
{
throw new ArgumentException(String.Format("The specified property does not exist: {0}", propertyName), "propertyName");
}
ISharedApplicationSettingsProvider provider = GetSharedSettingsProvider(property.Provider);
if (provider == null)
{
return(null);
}
SettingsPropertyValueCollection values = provider.GetPreviousSharedPropertyValues(settings.Context,
new SettingsPropertyCollection {
property
}, previousExeConfigFilename);
SettingsPropertyValue value = values[propertyName];
return(value == null ? null : value.PropertyValue);
}
internal static void MigrateSharedSettings(ApplicationSettingsBase settings, string previousExeConfigFilename)
{
if (settings is IMigrateSettings)
{
IMigrateSettings customMigrator = (IMigrateSettings)settings;
foreach (SettingsProvider settingsProvider in settings.Providers)
{
ISharedApplicationSettingsProvider sharedSettingsProvider = GetSharedSettingsProvider(settingsProvider);
if (sharedSettingsProvider == null || !sharedSettingsProvider.CanUpgradeSharedPropertyValues(settings.Context))
{
continue;
}
var properties = GetPropertiesForProvider(settings, settingsProvider);
var previousValues = sharedSettingsProvider.GetPreviousSharedPropertyValues(settings.Context,
properties, previousExeConfigFilename);
if (previousValues == null || previousValues.Count == 0)
{
continue;
}
var currentValues = sharedSettingsProvider.GetSharedPropertyValues(settings.Context, properties);
foreach (SettingsPropertyValue previousValue in previousValues)
{
SettingsPropertyValue currentValue = currentValues[previousValue.Name];
if (currentValue == null)
{
continue;
}
MigrateProperty(customMigrator, MigrationScope.Shared, currentValue, previousValue.PropertyValue);
}
foreach (SettingsPropertyValue property in currentValues)
{
if (!property.IsDirty)
{
continue;
}
sharedSettingsProvider.SetSharedPropertyValues(settings.Context, currentValues);
break;
}
}
}
else
{
foreach (SettingsProvider settingsProvider in settings.Providers)
{
ISharedApplicationSettingsProvider sharedSettingsProvider = GetSharedSettingsProvider(settingsProvider);
if (sharedSettingsProvider == null)
{
continue;
}
var properties = GetPropertiesForProvider(settings, settingsProvider);
sharedSettingsProvider.UpgradeSharedPropertyValues(settings.Context, properties, previousExeConfigFilename);
}
}
SaveIfDirty(settings);
//Need to call Reload because changes to shared settings aren't automatically realized by the .NET settings framework.
settings.Reload();
}