binding in rating?

[sivakanth]

Hello Telerik Team,

I have small doubt in wpf rating,
     How to bind rad rating? Bcoz i want to store the rated value in database.
our telerik version is 2010_2_0723_DEV.

[Petar Mladenov]

Hello sivakanth,

Binding the value of RadRating could be achieved by using a ViewModel like so:

<telerik:RadRating Width="120" Height="40" Value="{Binding RatingValue}" x:Name="ratingControl"/>

class RatingViewModel
    {
        public double RatingValue
        {
            get;
            set;
        }
    }

public MainWindow()
      {
          InitializeComponent();
          this.ratingControl.DataContext = new RatingViewModel() { RatingValue = 4.5 };
      }

Please let us know if this fits in your scenario.

Greetings,
Petar Mladenov
the Telerik team

[Dan]

This example is not working. the value is read from the binding, however the value is not set back to the binding. 

This is my workaround

    Private Sub RadRating1_ValueChanged(sender As Object, e As System.Windows.RoutedPropertyChangedEventArgs(Of Double?)) Handles RadRating1.ValueChanged
        CType(DataContext, MyObject).Rating = RadRating1.Value
    End Sub

Version: 2012.1.215.40

[Tina Stancheva]

Hello Dan,

You don't have to handle the ValueChanged event. Instead you can set the binding mode of the Value property to TwoWay:

<telerik:RadRating Value="{Binding Rating, Mode=TwoWay}" />

I attached a sample project demonstrating this approach. Please give it a try and let us know if it helps.

Kind regards,
Tina Stancheva
the Telerik team

[Dan]

Thank you Tina for your response.  Your suggestion works, however, Telerik should change this to the default behavior. It's more reasonable to assume 2 way binding on every control until otherwise set that way.

Thanks again for your help.