Questions on UI for WinForms Forum

1 answer

200 views

Hi All,

In our WinForms application we have some hierarchival gridviews (we call them master-detail grid). This week we upgraded to the new 2010.3 10.1109 version, the last version was the 2010.2 10.914, and the application worked fine with the older verion.

But, now:
In the UserAddedRow event the e.Row.Hierarchilevel is 1 always, and not 0 in the case of new master rows.

In the UserDeletedRow event the e.Row.DataBoundItem is null, so, e.g.: e.Row.DataBoundItem.GetType().Name throws a NullReferenceException.

Any idea?

Best regards,

Peter Szintai

GridView

answered on 17 Nov 2010

13 answers

467 views

[Solved] Child nodes loaded on demand

I have a situation where I want to create a treeview that has 4 levels. I want to immediately load the first two levels, and only load levels 3 and 4 for a particular level 2 node when it is expanded. I would like all of these nodes to be bound to a datatable(s) for ease of updating the data. What would be the best way to accomplish this? I am experimenting with both related tables in a hierarchy, and a self-referencing table, but haven't seen the exact results I am looking for. Thanks for your help!

Treeview

answered on 17 Nov 2010

4 answers

358 views

[Solved] RadGridView: Loop over RowInfo: Set Row.IsVisible

Hello,

I just wanted to share this in case anyone else had the same issue.

Scenario
+ RadGridView bound to datasource.
+ Multiselect enabled

Pre Q3 2010 you were able to loop over the rows and set each SelectedRow IsVisible property to False as below

Private Sub RadButton1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadButton1.Click

    Try

        Me.Cursor = Cursors.WaitCursor

        For Each row As GridViewRowInfo In Me.RadGridView1.SelectedRows

            row.IsVisible = False

        Next

    Finally

        Me.Cursor = Cursors.Default

    End Try

End Sub

Post Q3, you can only do this if you have only 1 row selected. With multiple rows selected the RadGridView throws an InvalidOperationException (collection was modified) exception.

In order to get over this, one needs to use the BeginUpdate / EndUpdate methods of RadGridView.

The modified code is below:

Private Sub RadButton1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadButton1.Click

    Try

        Me.Cursor = Cursors.WaitCursor

        Me.RadGridView1.BeginUpdate()

        For Each row As GridViewRowInfo In Me.RadGridView1.SelectedRows

            row.IsVisible = False

        Next

        Me.RadGridView1.EndUpdate(True)

    Finally

        Me.Cursor = Cursors.Default

    End Try

End Sub

hope someone finds this useful.

Richard

EDIT: Changed the BeginUpdate and EndUpdate to outside of the loop

GridView

answered on 17 Nov 2010

6 answers

227 views

[Solved] ImageIndex issue

Hello!

I have an issue with assigning the ImageIndex of GridCellElement.

Let’s take a simple code sample. An image list with a single image is assigned to the grid view. All settings are by default.

01.public partial class Form1 : Form

02.{

03. public Form1()

04. {

05. InitializeComponent();

06.

07. for (int i = 0; i < 8; i++)

08. radGridView1.Columns.Add(new GridViewTextBoxColumn());

09.

10. for (int i = 0; i < 8; i++)

11. radGridView1.Rows.Add(radGridView1.Rows.NewRow());

12. }

13.

14. private void radGridView1_CellFormatting(object sender, CellFormattingEventArgs e)

15. {

16. if ((e.CellElement.RowIndex + e.CellElement.ColumnIndex) % 2 == 0)

17. {

18. e.CellElement.ImageIndex = 0;

19. }

20. }

21.}

When I build this sample with “RadControls for WinForms Q3 2009 SP1” it shows the “chessboard”. But when I build it with the latest “RadControls for WinForms Q2 2010 SP2” it shows an empty grid.

To have it running as expected I have to do the following workaround (see line 5):

1.private void radGridView1_CellFormatting(object sender, CellFormattingEventArgs e)

2.{

3. if ((e.CellElement.RowIndex + e.CellElement.ColumnIndex) % 2 == 0)

4. {

5. e.CellElement.ImageIndex = -1;

6. e.CellElement.ImageIndex = 0;

7. }

8.}

So, perhaps this is a bug.

Thank you.

GridView

answered on 17 Nov 2010

9 answers

2.0K+ views

A way to hide first column?

Hi,
Is there a way to hide the first column in GridView? Or at least to change it to size 0-5?

Thanks

GridView

answered on 17 Nov 2010

3 answers

207 views

Aggregates property

Hello,
I just upgraded from Q1 2010 Sp2 to Q2 2010 SP2, and it seems that the Aggregates property from the DataGroup class is gone. I don't see anything on it in the release notes or on the forum. Am I missing something? Maybe I'm just wrong, I'm new to Telerik, I'm just upgrading a software made by someone who does not work here anymore...

Thank you!

Steve

GridView

answered on 17 Nov 2010

1 answer

491 views

[Solved] Change RadTreeView BackColor

Hello,

I have applied the Office2010 theme to my WinForm application by adding the Office2010Theme to the form and setting

ThemeResolutionService.ApplicationThemeName = Properties.Settings.Default.ApplicationThemeName;

Everything works just fine and I am satisfied with the result, except for one small detail. I would like to change the background color of the RadTreeView to white instead of the default gray-ish. Setting the BackColor property of the RadTreeView control does not do the trick, so is there any other way I can do it (in code or otherwise)?

Best regards
Linus

Themes and Visual Style Builder

answered on 17 Nov 2010

7 answers

225 views

[Solved] Event on user entry validation

Hi,

I'm working in VB with 2010Q3 terik winform.

I have a RadDropDownList with some predefined items.
I wan't to give possibilty for users to enter their values if needed.

But I don't find how to trap when they have finished to enter the text.

The event IndexChanges fire only when they choose a predefined value
The event TextChange fire every time user press a key
The event SelectedValueChanged never fire !

I need to update my form when user choose a item from existing value or when user have finished to entered his own value.

Thanks for your help.

Anthony

DropDownList

answered on 17 Nov 2010

13 answers

216 views

[Solved] Support Request

Richard,

You may be aware of some support questions raised by Fathi Bellahcene at Total in Paris. He works for me. He's on a public holiday today in France so I can't contact him to get our support account details. I need to raise some support issues with you guys. Is it possible you could contact me at martin.ramsey@total.com please ?

General Discussions

answered on 17 Nov 2010

4 answers

454 views

[Solved] Customizing the Timeline View

I am looking to use the Timeline View with Resource Grouping to show a timeline of about three months, (from 2-weeks-ago to 2-months-from-now), all visible at once, and allow for scrolling beyond those visible limits.

It seems that, by default, the timeline shows only 7 days ahead of the StartDate which I have set to DateTime.Now.AddDays(-14) to set the first visible date back two weeks from today. I would like to be able to set the number of visible days to ±70, (and eventually use a radtrackBar to dynamically change the number of visible days).

Aside from that, how would I set the width of the day 'columns' in the TimeLine? Most of the appointments I will be adding to the scheduler will be several days, even weeks in duration and I will only require a month heading and a numerical day label.

Thanks,
Adam

Scheduler and Reminder

answered on 17 Nov 2010