Implementing View-ViewModel

The purpose of this tutorial is to show you how to bind a RadGanttView with a ViewModel.

Before reading this tutorial you should get familiar with the Data Binding support of the RadGanttView control.

• Add a new RadGanttView declaration in your XAML:

<telerik:RadGanttView x:Name="ganttView" /> 

• Create a new class named MyViewModel:

public class MyViewModel 
{ 
} 

• In the MyViewModel class add Tasks property. We will bind the TasksSource property of the RadGanttView to this property.

public class MyViewModel : PropertyChangedBase 
{ 
    private ObservableCollection<GanttTask> tasks; 
 
    public ObservableCollection<GanttTask> Tasks 
    { 
        get 
        { 
            return tasks; 
        } 
        set 
        { 
            tasks = value; 
            OnPropertyChanged(() => Tasks); 
        } 
    } 
} 

• All we have to do is to initialize the tasks field:

public MyViewModel() 
{ 
    var date = DateTime.Now; 
 
    var ganttAPI = new GanttTask() { Start = date, End = date.AddDays(2), Title = "Design public API" }; 
    var ganttRendering = new GanttTask() { Start = date.AddDays(2).AddHours(8), End = date.AddDays(4), Title = "Gantt Rendering" }; 
    var ganttDemos = new GanttTask() { Start = date.AddDays(5), End = date.AddDays(7), Title = "Gantt Demos" }; 
 
    var milestone = new GanttTask() { Start = date.AddDays(7), End = date.AddDays(7).AddHours(1), Title = "Review", IsMilestone = true }; 
 
    ganttRendering.Dependencies.Add(new Dependency() { FromTask = ganttAPI }); 
    ganttDemos.Dependencies.Add(new Dependency() { FromTask = ganttRendering }); 
 
    var iterationTask = new GanttTask(date, date.AddDays(7), "Iteration 1") 
    { 
        Children = { ganttAPI, ganttRendering, ganttDemos, milestone } 
    }; 
 
 
    this.tasks = new ObservableCollection<GanttTask>() { iterationTask }; 
} 

• The ViewModel is complete. Now, let's return to the View. Add TasksSource property to the definition of the GanttView:

<telerik:RadGanttView x:Name="ganttView1" TasksSource="{Binding Tasks}"  /> 

• Finally, set the DataContext:
  

this.DataContext = new MyViewModel(); 

And the result is: