Using the WPF Report Viewer in an MVVM scenario
Environment
| Product | Progress® Telerik® Reporting |
| Report Viewer | WPF |
Description
Only dependency properties of the WPF Report Viewer control, designed for the WPF technology, can be bound to properties of a model. A model can have a ReportSource property bound to the viewer's ReportSource.
Solution
- Consider the following example of a model:
class ViewModel : INotifyPropertyChanged
{
private int testCounter = 0;
public event PropertyChangedEventHandler PropertyChanged;
Telerik.Reporting.ReportSource _myReportSource;
public Telerik.Reporting.ReportSource MyReportSource
{
get { return this._myReportSource; }
set
{
if (this._myReportSource != value)
{
this._myReportSource = value;
if (null != this.PropertyChanged)
{
this.PropertyChanged(this, new PropertyChangedEventArgs("MyReportSource"));
}
}
}
}
public ViewModel()
{
this.MyReportSource = null;// new InstanceReportSource { ReportDocument = null };
_thisCommand = new Telerik.Windows.Controls.DelegateCommand(x => ChangeReport());
}
ICommand _thisCommand;
public ICommand ThisCommand
{
get
{
return _thisCommand;
}
}
public void ChangeReport()
{
if (testCounter % 2 == 1)
this.MyReportSource = new InstanceReportSource { ReportDocument = new Report1() };
else
this.MyReportSource = new InstanceReportSource { ReportDocument = new Report2() };
testCounter++;
}
}
- The above model can be related to the WPF ReportViewer as follows:
<Window.DataContext>
<vm:ViewModel />
</Window.DataContext>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="50" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<Button x:Name="ChangeReportButton" Grid.Row="0" Height="30" Width="100" Command="{Binding ThisCommand}" Content="Change Report" >
</Button>
<tr:ReportViewer Grid.Row="1" x:Name="ReportViewer1" HorizontalAlignment="Stretch" ReportSource="{Binding MyReportSource}" >
</tr:ReportViewer>
</Grid>
Notes
Reports have a general purpose and can be reused in different types of projects. Reports do not have dependency properties. If you need to change the data in a report, on trigger the change event of other control you can update data items' DataSource properties in code. Then update the model's ReportSource in order to refresh the viewer.