private IHierarchicalDataSource ConnectToHierarchicalDataSource()
{
if (this._currentDataSourceValid && !base.DesignMode)
{
if ((!this._currentDataSourceIsFromControl && (this.DataSourceID != null)) && (this.DataSourceID.Length != 0))
{
throw new InvalidOperationException(System.Web.SR.GetString("DataControl_MultipleDataSources", new object[] { this.ID }));
}
return(this._currentHierarchicalDataSource);
}
if ((this._currentHierarchicalDataSource != null) && this._currentDataSourceIsFromControl)
{
this._currentHierarchicalDataSource.DataSourceChanged -= new EventHandler(this.OnDataSourceChanged);
}
this._currentHierarchicalDataSource = this.GetDataSource();
this._currentDataSourceIsFromControl = base.IsBoundUsingDataSourceID;
if (this._currentHierarchicalDataSource == null)
{
this._currentHierarchicalDataSource = new ReadOnlyHierarchicalDataSource(this.DataSource);
}
else if (this.DataSource != null)
{
throw new InvalidOperationException(System.Web.SR.GetString("DataControl_MultipleDataSources", new object[] { this.ID }));
}
this._currentDataSourceValid = true;
if ((this._currentHierarchicalDataSource != null) && this._currentDataSourceIsFromControl)
{
this._currentHierarchicalDataSource.DataSourceChanged += new EventHandler(this.OnDataSourceChanged);
}
return(this._currentHierarchicalDataSource);
}
private IHierarchicalDataSource ConnectToHierarchicalDataSource()
{
if (this._currentDataSourceValid && !base.DesignMode)
{
if ((!this._currentDataSourceIsFromControl && (this.DataSourceID != null)) && (this.DataSourceID.Length != 0))
{
throw new InvalidOperationException(System.Web.SR.GetString("DataControl_MultipleDataSources", new object[] { this.ID }));
}
return this._currentHierarchicalDataSource;
}
if ((this._currentHierarchicalDataSource != null) && this._currentDataSourceIsFromControl)
{
this._currentHierarchicalDataSource.DataSourceChanged -= new EventHandler(this.OnDataSourceChanged);
}
this._currentHierarchicalDataSource = this.GetDataSource();
this._currentDataSourceIsFromControl = base.IsBoundUsingDataSourceID;
if (this._currentHierarchicalDataSource == null)
{
this._currentHierarchicalDataSource = new ReadOnlyHierarchicalDataSource(this.DataSource);
}
else if (this.DataSource != null)
{
throw new InvalidOperationException(System.Web.SR.GetString("DataControl_MultipleDataSources", new object[] { this.ID }));
}
this._currentDataSourceValid = true;
if ((this._currentHierarchicalDataSource != null) && this._currentDataSourceIsFromControl)
{
this._currentHierarchicalDataSource.DataSourceChanged += new EventHandler(this.OnDataSourceChanged);
}
return this._currentHierarchicalDataSource;
}
/// <devdoc>
/// Gets the IHierarchicalDataSource that this control is bound to, if any.
/// </devdoc>
protected virtual IHierarchicalDataSource GetDataSource()
{
if (!DesignMode && _currentDataSourceValid && (_currentHierarchicalDataSource != null))
{
return(_currentHierarchicalDataSource);
}
IHierarchicalDataSource 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.HierarchicalDataControl_DataSourceDoesntExist, ID, dataSourceID));
}
ds = control as IHierarchicalDataSource;
if (ds == null)
{
throw new HttpException(SR.GetString(SR.HierarchicalDataControl_DataSourceIDMustBeHierarchicalDataControl, ID, dataSourceID));
}
}
return(ds);
}
void Initialize()
{
if (!Page.IsPostBack || (IsViewStateEnabled && !IsDataBound))
{
RequiresDataBinding = true;
}
IHierarchicalDataSource ds = GetDataSource();
if (ds != null && DataSourceID != "")
{
ds.DataSourceChanged += new EventHandler(OnDataSourceChanged);
}
}
/// <devdoc>
/// Connects this hierarchical data bound control to the appropriate
/// HierarchicalDataSource and hooks up the appropriate event listener
/// for the DataSourceChanged event. The return value is the new data source
/// (if any) that was connected to. An exception is thrown if there is
/// a problem finding the requested data source.
/// </devdoc>
private IHierarchicalDataSource ConnectToHierarchicalDataSource()
{
if (_currentDataSourceValid && !DesignMode)
{
// Ensure that both DataSourceID as well as DataSource are not set at the same time
if (!_currentDataSourceIsFromControl && DataSourceID != null && DataSourceID.Length != 0)
{
throw new InvalidOperationException(SR.GetString(SR.DataControl_MultipleDataSources, ID));
}
// If the current view is correct, there is no need to reconnect
return(_currentHierarchicalDataSource);
}
// Disconnect from old view, if necessary
if ((_currentHierarchicalDataSource != null) && (_currentDataSourceIsFromControl))
{
// We only care about this event if we are bound through the DataSourceID property
_currentHierarchicalDataSource.DataSourceChanged -= new EventHandler(OnDataSourceChanged);
}
// Connect to new view
_currentHierarchicalDataSource = GetDataSource();
_currentDataSourceIsFromControl = IsBoundUsingDataSourceID;
if (_currentHierarchicalDataSource == null)
{
// HierarchicalDataSource control was not found, construct a temporary data source to wrap the data
_currentHierarchicalDataSource = new ReadOnlyHierarchicalDataSource(DataSource);
}
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));
}
}
_currentDataSourceValid = true;
if ((_currentHierarchicalDataSource != null) && (_currentDataSourceIsFromControl))
{
// We only care about this event if we are bound through the DataSourceID property
_currentHierarchicalDataSource.DataSourceChanged += new EventHandler(OnDataSourceChanged);
}
return(_currentHierarchicalDataSource);
}
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);
}
/// <devdoc>
/// Connects this hierarchical data bound control to the appropriate
/// HierarchicalDataSource and hooks up the appropriate event listener
/// for the DataSourceChanged event. The return value is the new data source
/// (if any) that was connected to. An exception is thrown if there is
/// a problem finding the requested data source.
/// </devdoc>
private IHierarchicalDataSource ConnectToHierarchicalDataSource() {
if (_currentDataSourceValid && !DesignMode) {
// Ensure that both DataSourceID as well as DataSource are not set at the same time
if (!_currentDataSourceIsFromControl && DataSourceID != null && DataSourceID.Length != 0) {
throw new InvalidOperationException(SR.GetString(SR.DataControl_MultipleDataSources, ID));
}
// If the current view is correct, there is no need to reconnect
return _currentHierarchicalDataSource;
}
// Disconnect from old view, if necessary
if ((_currentHierarchicalDataSource != null) && (_currentDataSourceIsFromControl)) {
// We only care about this event if we are bound through the DataSourceID property
_currentHierarchicalDataSource.DataSourceChanged -= new EventHandler(OnDataSourceChanged);
}
// Connect to new view
_currentHierarchicalDataSource = GetDataSource();
_currentDataSourceIsFromControl = IsBoundUsingDataSourceID;
if (_currentHierarchicalDataSource == null) {
// HierarchicalDataSource control was not found, construct a temporary data source to wrap the data
_currentHierarchicalDataSource = new ReadOnlyHierarchicalDataSource(DataSource);
}
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));
}
}
_currentDataSourceValid = true;
if ((_currentHierarchicalDataSource != null) && (_currentDataSourceIsFromControl)) {
// We only care about this event if we are bound through the DataSourceID property
_currentHierarchicalDataSource.DataSourceChanged += new EventHandler(OnDataSourceChanged);
}
return _currentHierarchicalDataSource;
}
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;
}
protected virtual IHierarchicalDataSource GetDataSource()
{
if ((!base.DesignMode && this._currentDataSourceValid) && (this._currentHierarchicalDataSource != null))
{
return(this._currentHierarchicalDataSource);
}
IHierarchicalDataSource 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("HierarchicalDataControl_DataSourceDoesntExist", new object[] { this.ID, dataSourceID }));
}
source = control as IHierarchicalDataSource;
if (source == null)
{
throw new HttpException(System.Web.SR.GetString("HierarchicalDataControl_DataSourceIDMustBeHierarchicalDataControl", new object[] { this.ID, dataSourceID }));
}
}
return(source);
}
