RadGridView : Refresh problem

[jv]

Hi.

I'm using RadControls for WinForms Q3 2008 SP2 and i always have problems to refresh the RadGridView.

I have a class ObjectInfo with some properties.

I have a form with a RadGridView and a BindingList :

private BindingList<ObjectInfo> _listObjects;

In Form1_Load :
radGrid.DataSource=_listObjects;

When I change one property of an object of _listObjects, the Refresh method doesn't work, the only way to refresh the GridView is to do :

radGrid.DataSource = null;
radGrid.DataSource = _listObjects;

Is there any other solution ? Because it takes time because there are many rows, rows are formatted with different colors depending on the value of a column (Event RowFormatting), and the grid scrolls on the first row so I have to call the EnsureVisible method because the user can't see anymore the selected row. And also I have to redefine columns (Width, FormatString for Date for example, etc...).

Thanks.

[Julian Benkov]

Hello jv,

Your ObjectInfo class must implement INotifyPropertyChanged interface to support automatic refresh when used in RadGridView. Please view this example:

public class OBjectInfo : INotifyPropertyChanged
{
    private string name;

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

    private void OnPropertyChanged(string propertyName)
    {
        this.OnPropertyChanged(new PropertyChangedEventArgs(propertyName));
    }

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

    #region INotifyPropertyChanged Members

    public event PropertyChangedEventHandler PropertyChanged;

    #endregion
}

Kind regards,
Julian Benkov
the Telerik team

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[jv]

It works fine, thanks for the reply.

[jv]

Hello,

To avoid implementing INotifyPropertyChanged in all classes and call this.OnPropertyChanged in all set accessors, we finally found an easiest solution : in the CellValueChanged of the RadGridView we only write this :

RadGridView.ReadOnly = !RadGridView.ReadOnly;
RadGridView.ReadOnly = !RadGridView.ReadOnly;

[Nick]

Hello jv,

Thank you for contacting us. Unfortunately, while this may work, it is certainly not the best solution as you are actually refreshing the grid using this strange shortcut. If you implement the interface, the refresh will be more accurate and you will gain performance improvement.

Do not hesitate to write us back if you have further questions.

Greetings,
Nick
the Telerik team

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[Ehab]

Hi,

Why not implementing RefreshData() method in row (like notifing manualy) or somthing like that and make your users life easier ;).
I dont want implement the INotify in all my classes (DTOs) because I cant (no time) , Pleaaaaaaaaaaaaase give me a work around to force the row or the whole grid to redraw the data.  
jv work around didnt work for me

[Ehab]

Hi,

I  found an elegant work around .
After updating row data in the data source just call   InvalidateRow() method  from the specific GridViewRowInfo.

For example:

(( IssueClass )RadGridView1.CurrentRow.DataBoundItem).Satus= "Resolved" ;
RadGridView1.CurrentRow.InvalidateRow() ; 

[Julian Benkov]

Hi Enab,

As you found out, in order to update the GridViewRowInfo you can call the InvalidateRow method. Another option is to call the Refresh method of the GridViewTemplate when you want to update all rows in the current view of the RadGridView control.

All the best,
Julian Benkov
the Telerik team

[mostafa]

Hi.

In my case just the selected rowwas changed!!!

[Hristo]

Hello Mostafa,

Thank you for writing.

Can you please provide me with some details about your actual scenario and the version of the controls you are using? 

Looking forward to your reply.

Regards,
Hristo Merdjanov
Telerik by Progress

[mostafa]

Thanks for your reply,

BindingList Class solved my problem.

[Michael]

Please provide example of using GridViewTemplate to refresh the RadGridView.  Thanks.

[Hristo]

Hello Michael,

Thank you for writing back.

You can use the GridViewTemplate.Refresh method which will refresh the associated data view: 

this.radGridView1.MasterTemplate.Refresh();

I hope this helps. Should you have further questions please do not hesitate to write back.

Regards,
Hristo
Telerik by Progress