private DataSourceView ConnectToDataSourceView()
{
if (!this._currentViewValid || base.DesignMode)
{
if ((this._currentView != null) && this._currentViewIsFromDataSourceID)
{
this._currentView.DataSourceViewChanged -= new EventHandler(this.OnDataSourceViewChanged);
}
IDataSource source = null;
string dataSourceID = this.DataSourceID;
if (dataSourceID.Length != 0)
{
Control control = DataBoundControlHelper.FindControl(this, dataSourceID);
if (control == null)
{
throw new HttpException(System.Web.SR.GetString("DataControl_DataSourceDoesntExist", new object[] { this.ID, dataSourceID }));
}
source = control as IDataSource;
if (source == null)
{
throw new HttpException(System.Web.SR.GetString("DataControl_DataSourceIDMustBeDataControl", new object[] { this.ID, dataSourceID }));
}
}
if (source == null)
{
source = new ReadOnlyDataSource(this.DataSource, this.DataMember);
}
else if (this.DataSource != null)
{
throw new InvalidOperationException(System.Web.SR.GetString("DataControl_MultipleDataSources", new object[] { this.ID }));
}
DataSourceView view = source.GetView(this.DataMember);
if (view == null)
{
throw new InvalidOperationException(System.Web.SR.GetString("DataControl_ViewNotFound", new object[] { this.ID }));
}
this._currentViewIsFromDataSourceID = this.IsBoundUsingDataSourceID;
this._currentView = view;
if ((this._currentView != null) && this._currentViewIsFromDataSourceID)
{
this._currentView.DataSourceViewChanged += new EventHandler(this.OnDataSourceViewChanged);
}
this._currentViewValid = true;
}
return(this._currentView);
}
/// <devdoc>
/// Connects this data bound control to the appropriate DataSourceView
/// and hooks up the appropriate event listener for the
/// DataSourceViewChanged event. The return value is the new view (if
/// any) that was connected to. An exception is thrown if there is
/// a problem finding the requested view or data source.
/// </devdoc>
private DataSourceView ConnectToDataSourceView()
{
if (_currentViewValid && !DesignMode)
{
// If the current view is correct, there is no need to reconnect
return(_currentView);
}
// Disconnect from old view, if necessary
if ((_currentView != null) && (_currentViewIsFromDataSourceID))
{
// We only care about this event if we are bound through the DataSourceID property
_currentView.DataSourceViewChanged -= new EventHandler(OnDataSourceViewChanged);
}
// Connect to new view
IDataSource ds = null;
string dataSourceID = DataSourceID;
if (dataSourceID.Length != 0)
{
// Try to find a DataSource control with the ID specified in DataSourceID
Control control = DataBoundControlHelper.FindControl(this, dataSourceID);
if (control == null)
{
throw new HttpException(SR.GetString(SR.DataControl_DataSourceDoesntExist, ID, dataSourceID));
}
ds = control as IDataSource;
if (ds == null)
{
throw new HttpException(SR.GetString(SR.DataControl_DataSourceIDMustBeDataControl, ID, dataSourceID));
}
}
if (ds == null)
{
// DataSource control was not found, construct a temporary data source to wrap the data
ds = new ReadOnlyDataSource(DataSource, DataMember);
}
else
{
// Ensure that both DataSourceID as well as DataSource are not set at the same time
if (DataSource != null)
{
throw new InvalidOperationException(SR.GetString(SR.DataControl_MultipleDataSources, ID));
}
}
// IDataSource was found, extract the appropriate view and return it
DataSourceView newView = ds.GetView(DataMember);
if (newView == null)
{
throw new InvalidOperationException(SR.GetString(SR.DataControl_ViewNotFound, ID));
}
_currentViewIsFromDataSourceID = IsBoundUsingDataSourceID;
_currentView = newView;
if ((_currentView != null) && (_currentViewIsFromDataSourceID))
{
// We only care about this event if we are bound through the DataSourceID property
_currentView.DataSourceViewChanged += new EventHandler(OnDataSourceViewChanged);
}
_currentViewValid = true;
return(_currentView);
}
