[Solved] GridView is not refreshed

[xp]

we have one gridview and one textbox. when user select one row in gridview, the textbox'Text is bind to  content of one cell in selected row.
If Textbox 's Text changed, we can see the CurrentItem and ItemsSource changed, but gridView UI is not refreshed.  How to refresh it?

If I call gridview.Rebind(), the gridview UI will refresh, but selection and currentitem are gone. if there are a lot of row in gridview, rebind will take a long time.

Thanks

[Milan]

Hello sam,

I am not sure if I got your question correctly so I would like to ask you for some clarifications. When the TextBox's text changes what data do you expect to change - is it the cell value that the TextBox is bound to?

All the best,
Milan
the Telerik team

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[xp]

Hi Milan,

Here is my xaml:

...
  <telerikGrid:RadGridView Name="MyDataGrid" IsReadOnly="True"  AutoGenerateColumns="False" >
                <telerikGrid:RadGridView.Columns>
                    <telerikGrid:GridViewDataColumn HeaderText="Description" DataMemberPath="ValidationTypeDesc"/>
                <telerikGrid:RadGridView.Columns>
</telerikGrid:RadGridView>

...
                        <TextBox x:Name="txtMyDesc" Text="{Binding ElementName=MyDataGrid, Path=CurrentItem.MyDesc, Mode=TwoWay}" />

..
Codes behind:
  MyDataGrid.ItemsSource = myCollection;
  //myCollection is a ObservableCollection
....

When user select different row in DataGrid, the TextBox will display different MyDesc accordly without problem. However, when user change Textbox's Text, DataGrid's UI is not refreshed. In debug mode, I check the ItemsSource did change after user change TextBox's Text.

Do I need to set GridView's ItemsSource to a twoway binding? something like this:
            Binding b = new Binding();
            b.Mode = BindingMode.TwoWay;
            b.Source = myCollection;
            b.Path = ...;//Problem is here, how to set path to a ObservableCollection?
            MyDataGrid.SetBinding(Telerik.Windows.Controls.RadGridView.ItemsSourceProperty, b);

..

Thanks

[Milan]

Hello sam,

The grid is not updated because there is no way to detect that the MyDesc property of a particular object has changed. In order to support such scenarios your data objects should implement the INotifyPropertyChanged interface and raise PropertyChange events whenever a property value changes.

Here you can find more information about the INotifyPropertychanged interface - http://msdn.microsoft.com/en-us/library/system.componentmodel.inotifypropertychanged(VS.95).aspx

Here is a sample implementation:

public class Person : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;
    private string Fname;

    public string FName
    {
        get
        {
            return this.Fname;
        }
        set
        {
            this.Fname = value;
            this.OnPropertyChanged("FName");
        }
    }

    protected virtual void OnPropertyChanged(string propertyName)
    {
        if (this.PropertyChanged != null)
        {
            this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

Greetings,
Milan
the Telerik team

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