private object[] GetDataSourceControls(object instance, IContainer container)
{
ComponentCollection components = container.Components;
ArrayList dataSources = new ArrayList();
ICollection controls = null;
if (instance is Array)
{
controls = (Array)instance;
}
else
{
controls = new IBusinessObjectBoundWebControl[] { (IBusinessObjectBoundWebControl)instance }
};
for (int idxComponents = 0; idxComponents < components.Count; idxComponents++)
{
IComponent component = (IComponent)components[idxComponents];
IBusinessObjectDataSourceControl dataSource = component as IBusinessObjectDataSourceControl;
if (dataSource != null && !string.IsNullOrEmpty(dataSource.ID))
{
bool hasSelfReference = false;
foreach (IBusinessObjectBoundWebControl control in controls)
{
if (dataSource == control)
{
hasSelfReference = true;
break;
}
}
if (!hasSelfReference)
{
dataSources.Add(dataSource.ID);
}
}
}
dataSources.Sort(Comparer.Default);
return(dataSources.ToArray());
}
/// <summary> Uses the value of <see cref="DataSourceControl"/> to set <see cref="DataSource"/>. </summary>
/// <remarks>
/// Due to <b>Design Mode</b> behavior of Visual Studio .NET the <see cref="IComponent.Site"/> property is
/// utilized for finding the data source during <b>Design Mode</b>.
/// </remarks>
/// <exception cref="HttpException">
/// Thrown if the <see cref="DataSourceControl"/> is not <see langword="null "/> and could not be evaluated
/// to a valid <see cref="IBusinessObjectDataSourceControl"/> during <b>Run Time</b>.
/// </exception>
public void EnsureDataSource()
{
if (_dataSourceChanged)
{
// set _dataSource from ID in _dataSourceControl
if (string.IsNullOrEmpty(_dataSourceControl))
{
SetDataSource(null);
}
else
{
bool isDesignMode = ControlHelper.IsDesignMode(_control);
Control namingContainer = _control.NamingContainer;
if (namingContainer == null)
{
if (!isDesignMode)
{
throw new HttpException(string.Format("Cannot evaluate data source because control {0} has no naming container.", _control.ID));
}
// HACK: Designmode Naming container
// Not completely sure that Components[0] will always be the naming container.
if (_control.Site.Container.Components.Count > 0)
{
namingContainer = (_control.Site.Container.Components[0]) as Control;
}
else
{
return;
}
}
Control control = ControlHelper.FindControl(namingContainer, _dataSourceControl);
if (control == null)
{
if (!isDesignMode)
{
throw new HttpException(string.Format("Unable to find control id '{0}' referenced by the DataSourceControl property of '{1}'.", _dataSourceControl, _control.ID));
}
foreach (IComponent component in namingContainer.Site.Container.Components)
{
if (component is IBusinessObjectDataSourceControl &&
component is Control &&
((Control)component).ID == _dataSourceControl)
{
control = (Control)component;
break;
}
}
if (control == null)
{
SetDataSource(null);
_dataSourceChanged = true;
return;
}
}
IBusinessObjectDataSourceControl dataSource = control as IBusinessObjectDataSourceControl;
if (dataSource == null)
{
throw new HttpException(string.Format("The control with the id '{0}' referenced by the DataSourceControl property of '{1}' does not identify a control of type '{2}'.", _dataSourceControl, _control.ID, typeof(IBusinessObjectDataSourceControl)));
}
SetDataSource(dataSource);
}
_dataSourceChanged = false;
}
}
