HierarchicalDataSourceView IHierarchicalDataSource.GetHierarchicalView(string viewPath)
{
IHierarchicalDataSource source = this._dataSource as IHierarchicalDataSource;
if (source != null)
{
return(source.GetHierarchicalView(viewPath));
}
IHierarchicalEnumerable dataSource = this._dataSource as IHierarchicalEnumerable;
if (((dataSource != null) && (viewPath != null)) && (viewPath.Length != 0))
{
throw new InvalidOperationException(System.Web.SR.GetString("ReadOnlyHierarchicalDataSourceView_CantAccessPathInEnumerable"));
}
return(new ReadOnlyHierarchicalDataSourceView(dataSource));
}
/// <devdoc>
/// Check for IHierarchicalDataSource and IHierarchicalEnumerable, and
/// return an approprite HierarchicalDataSourceView.
/// </devdoc>
HierarchicalDataSourceView IHierarchicalDataSource.GetHierarchicalView(string viewPath)
{
// Check first for IHierarchicalDataSource
IHierarchicalDataSource ds = _dataSource as IHierarchicalDataSource;
if (ds != null)
{
return(ds.GetHierarchicalView(viewPath));
}
IHierarchicalEnumerable enumerable = _dataSource as IHierarchicalEnumerable;
if (enumerable != null && viewPath != null && viewPath.Length != 0)
{
throw new InvalidOperationException(SR.GetString(SR.ReadOnlyHierarchicalDataSourceView_CantAccessPathInEnumerable));
}
return(new ReadOnlyHierarchicalDataSourceView(enumerable));
}
/// <devdoc>
/// Gets the HierarchicalDataSourceView of the IHierarchicalDataSource
/// that this control is bound to, if any.
/// </devdoc>
protected virtual HierarchicalDataSourceView GetData(string viewPath)
{
string currentViewPath = viewPath;
IHierarchicalDataSource ds = ConnectToHierarchicalDataSource();
Debug.Assert(_currentDataSourceValid);
Debug.Assert(ds != null);
// IHierarchicalDataSource was found, extract the appropriate view and return it
HierarchicalDataSourceView view = ds.GetHierarchicalView(currentViewPath);
if (view == null)
{
throw new InvalidOperationException(SR.GetString(SR.HierarchicalDataControl_ViewNotFound, ID));
}
return(view);
}
protected virtual HierarchicalDataSourceView GetData(string viewPath)
{
if (DataSource != null && DataSourceID != "")
{
throw new HttpException();
}
IHierarchicalDataSource ds = GetDataSource();
if (ds != null)
{
return(ds.GetHierarchicalView(viewPath));
}
if (DataSource is IHierarchicalEnumerable)
{
return(new ReadOnlyDataSourceView((IHierarchicalEnumerable)DataSource));
}
return(null);
}
protected void ASPxCallback1_Callback(object sender, CallbackEventArgs e)
{
int newsID = int.Parse(e.Parameter);
IHierarchicalDataSource dataSource = (IHierarchicalDataSource)XmlDataSource1;
HierarchicalDataSourceView view = dataSource.GetHierarchicalView("");
IHierarchicalEnumerable enumerable = view.Select();
int index = 1;
string text = "";
foreach (object obj in enumerable)
{
if (newsID == index)
{
IHierarchyData data = enumerable.GetHierarchyData(obj);
PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(data);
PropertyDescriptor descriptor = properties.Find("Text", true);
text = descriptor.GetValue(obj).ToString();
break;
}
index++;
}
e.Result = text;
}
