How set Selected on Row from source

[Anton Samarin]

How i can select row in RadGridView in SelectionChanged event (i want to cancel selection)? I set SelectedItem and CurrentItem, but grid not display that this item is selected.

May be i can make necessary inspections before call SelectionChanged (but i can find method, which call before)?

Could you help me?!

[Rosi]

Hello Anton,

I suggest you find the Record corresponding to the Row and set its IsSelected property to true.

The following code illustrates how you can cancel the selection and select another row:

void radGridViewSelection_SelectionChanged(object sender, SelectionChangeEventArgs e)
{
  if (this.radGridViewSelection.SelectedRecords.Count > 0)
  {
    this.radGridViewSelection.SelectedRecords[0].IsSelected = false;
    radGridViewSelection.Records[3].IsSelected=true; //this will always select the 4th row.

  }
}

Regards,
Rosi
the Telerik team

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[Anton Samarin]

I know about this way, but it work not fine, because if you (in your example) select row number 6 ( for example) and after that click to 4th row you again call void radGridViewSelection_SelectionChanged - it is not correct work, i think.
If you select row number 6 ( for example) and click on it again you will can to edit it, but selection will be in 4th row!

I thought you know about this feature

[Rosi]

Hi Anton Samarin,

I am sorry for the misunderstanding.

The problem that you have described is actually a bug in the RadGridView control which will be fixed for the Service Pack. The issue is that the SelectionChanged event handler is executed too early. This is the reason why the code executed in the event handler will not have an effect.

You can workaround the problem by executing the code selecting the item asynchronously.

The following code illustrates how to achieve this:

private void radGridViewSelection_SelectionChanged(object sender, SelectionChangeEventArgs e)

{

this.Dispatcher.BeginInvoke(new SelectRow(this.changeSelectedRow), System.Windows.Threading.DispatcherPriority.Background, null);

}

delegate void SelectRow();  //this is the asynchronous delegate

private void changeSelectedRow()

{                 //your logic here             if (this.radGridViewSelection.SelectedRecords.Count > 0 && this.radGridViewSelection.SelectedRecords[0] != radGridViewSelection.Records[3])

{

this.radGridViewSelection.SelectedRecords[0].IsSelected = false;

radGridViewSelection.SelectedItem = radGridViewSelection.Items[3];

}

}

You can also find the attached project for a reference.

Your Telerik points have been updated for your involvement.

Regards,
Rosi
the Telerik team

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[Anton Samarin]

ok, thank you very much. i try to make some correction for my case.

[Anton Samarin]

Hello, i can't use your sample, because after click i 'come' in EditMode.

And I have a question. Why If i set radGridViewSelection.ItemsSource in window constructor

//example from your project

public Window1()

{

InitializeComponent();

this.radGridViewSelection.ItemsSource = GetObjectData();

}

radGridViewSelection.Items set items. But if i set radGridViewSelection.ItemsSource after, for example, button click radGridViewSelection.Items.count = 0 (but radGridViewSelection.ItemsSource.count != 0)?

I hope you understand me.

[Rosi]

Hi Anton Samarin,

The Q3 Service Pack release will be released by the end of the day. I suggest you download it from your account and try it. In this case you will not need the workaround from the previous message.You can then change the SelectedItem in the SelectionChanged event handler of RadGridView without using asynchronous method.

As for the second problem I suggest you use radGridViewSelection.Records.Count instead of radGridViewSelection.Items.Count. In this way you can safety get the count of the records.

Hope this helps.

Regards,
Rosi
the Telerik team

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[Anton Samarin]

ok, thank you very much.

My second problem connected with SelectionChanged, because Q3 Service Pack solve two problems.

[Rosi]

Hi Anton,

The Service Pack is available for download now. You can try it and let us know if you experience any problems.

Regards,
Rosi
the Telerik team

Check out Telerik Trainer, the state of the art learning tool for Telerik products.