private void SetDataConnection(object newDataSource, BindingMemberInfo newDisplayMember, bool force) {
bool dataSourceChanged = dataSource != newDataSource;
bool displayMemberChanged = !displayMember.Equals(newDisplayMember);
// make sure something interesting is happening...
//
//force = force && (dataSource != null || newDataSource != null);
if (inSetDataConnection) {
return;
}
try {
if (force || dataSourceChanged || displayMemberChanged) {
inSetDataConnection = true;
IList currentList = this.DataManager != null ? this.DataManager.List : null;
bool currentManagerIsNull = this.DataManager == null;
UnwireDataSource();
dataSource = newDataSource;
displayMember = newDisplayMember;
WireDataSource();
// Provided the data source has been fully initialized, start listening to change events on its
// currency manager and refresh our list. If the data source has not yet been initialized, we will
// skip this step for now, and try again later (once the data source has fired its Initialized event).
//
if (isDataSourceInitialized) {
CurrencyManager newDataManager = null;
if (newDataSource != null && BindingContext != null && !(newDataSource == Convert.DBNull)) {
newDataManager = (CurrencyManager)BindingContext[newDataSource, newDisplayMember.BindingPath];
}
if (dataManager != newDataManager) {
if (dataManager != null) {
dataManager.ItemChanged -= new ItemChangedEventHandler(DataManager_ItemChanged);
dataManager.PositionChanged -= new EventHandler(DataManager_PositionChanged);
}
dataManager = newDataManager;
if (dataManager != null) {
dataManager.ItemChanged += new ItemChangedEventHandler(DataManager_ItemChanged);
dataManager.PositionChanged += new EventHandler(DataManager_PositionChanged);
}
}
// See if the BindingField in the newDisplayMember is valid
// The same thing if dataSource Changed
// "" is a good value for displayMember
if (dataManager != null && (displayMemberChanged || dataSourceChanged) && displayMember.BindingMember != null && displayMember.BindingMember.Length != 0) {
if (!BindingMemberInfoInDataManager(displayMember))
throw new ArgumentException(SR.ListControlWrongDisplayMember, "newDisplayMember");
}
if (dataManager != null && (dataSourceChanged || displayMemberChanged || force)) {
// if we force a new data manager, then change the items in the list control
// only if the list changed or if we go from a null dataManager to a full fledged one
// or if the DisplayMember changed
if (displayMemberChanged || (force && (currentList != this.dataManager.List || currentManagerIsNull))) {
DataManager_ItemChanged(dataManager, new ItemChangedEventArgs(-1));
}
}
}
this.displayMemberConverter = null;
}
if (dataSourceChanged) {
OnDataSourceChanged(EventArgs.Empty);
}
if (displayMemberChanged) {
OnDisplayMemberChanged(EventArgs.Empty);
}
}
finally {
inSetDataConnection = false;
}
}
