Questions on UI for WinForms Forum

11 answers

396 views

Export to CSV

Need some help here...

I'm exporting a RadDataGrid to CSV but get the 'object reference to instance of an object' error. Every time i have a empty *.csv doc and the csvExporter.RunExport crashes...

Changing it to an Excel exporter makes it work fine.

code:

Dim exportGridView As New Telerik.WinControls.UI.RadGridView

exportGridView.DataSource = rep.GetObjectCorrespondentieGegevens(projectId)

Public Function GetObjectCorrespondentieGegevens(ByVal id As Integer) As Object Implements     ICorrespondentieRepository.GetObjectCorrespondentieGegevens

Dim model = From p In _db.tblAannemers.AsEnumerable() _

Select p.fldAannemerNaam

Return model

End Function

Private Shared Sub RunExportToCSV(ByVal fileName As String, ByRef gridView As RadGridView)

Dim csvExporter As ExportToCSV = New ExportToCSV(gridView)

'csvExporter.FileExtension = "txt"

'csvExporter.SummariesExportOption = SummariesOption.ExportAll

Try

'csvExporter.

csvExporter.SummariesExportOption = SummariesOption.DoNotExport

csvExporter.RunExport(fileName) ' this is where the exception happens :-(

Catch ex As Exception

End Try

End Sub

General Discussions

answered on 15 Mar 2011

1 answer

115 views

Order of strips to display

Hi,
I'm probably doing something wrong. But I have not find any help in documentation and in the demos.
When I prepare commandbar visually in designer, I'm able to move strips to correct order.
But how to do this in code?
I merge two commandbars together, so I add the strip to the commandCarRow, but in soe cases this second strip is displayed before the original first. And I have no clue why?

commandBarChild.Rows[0].Strips.Add(strip);

Thanks for any idea, as I said I didn't find any help in documentation or demos for that. If there is something about it, jsut point me there, please.

CommandBar

answered on 15 Mar 2011

3 answers

141 views

Invoke() on RabButtonElement ?

Hello

How can I change the properties from a RadButtonElement from another thread ?

Hervé

RibbonBar

answered on 15 Mar 2011

3 answers

258 views

Label and radmarkupeditor

I am needing to display some text on my form which has some older HTML tags, e.g. FONT, and other HTML tags.

The radlabel does not display the HTML properly even when wrapped in "<HTML>". However, if I set the value of the radmarkupeditor to the HTML, it is displayed properly. In fact, when I hit APPLY, it actually converts the older tags to more compliant versions, ala SPAN tags with STYLE attributes.

How can I get the label to display the HTML properly? Or which control does the radmarkupeditor take advantage of? Or can I call the internal "convert" method somehow?

Please advise!

TextBox

answered on 15 Mar 2011

3 answers

129 views

How to restrict user to leave a radForm in radDock.

Hello Everybody,

How to restrict users to leave from one radForm to other before completing a certain process in radDock. I tried to apply some logic on radDock_ActiveWindowChanged event but its not restraining it to change. Following code I wrote in radDock changed event.

((HostWindow)(this.radDock1.DockWindows(radDock1.ActiveWindow.Name + "1"))).Select();
((DocumentWindow)(this.RadDock1.DockWindows(windowName))).Select();

Thanks,
Saad

Dock

answered on 15 Mar 2011

1 answer

164 views

Code Share: Hide Filter row text

If you don't like the way the RadGridView adds the Filter text (e.g. Contains, Equals, etc) in the Filter row, you can use this code that I wrote. The text is unreadable in skinnier columns. Plus, it confused my users since clicking on the word "Contains" did not automatically allow them to start typing; they had to click next to the word.

Anyways, this code simply collapses the text element and adds a tooltip to the filter row's cell and button.

Private Sub RadGridView1_ToolTipTextNeeded(ByVal sender As Object, ByVal e As Telerik.WinControls.ToolTipTextNeededEventArgs) Handles RadGridView1.ToolTipTextNeeded

If TryCast(sender, GridFilterCellElement) IsNot Nothing Then

e.ToolTipText = CType(sender, GridCellElement).ToolTipText

End If

End Sub

Private Sub RadGridView1_ViewCellFormatting(ByVal sender As Object, ByVal e As Telerik.WinControls.UI.CellFormattingEventArgs) Handles RadGridView1.ViewCellFormatting

HideFilterText(e.CellElement)

End Sub

Friend Sub HideFilterText(ByVal CellElement As GridCellElement)

Dim oFilterCellElement As GridFilterCellElement

Try

If TryCast(CellElement, GridFilterCellElement) IsNot Nothing Then

oFilterCellElement = CType(CellElement, GridFilterCellElement)

oFilterCellElement.ToolTipText = oFilterCellElement.FilterOperatorText.Text.Replace(":", "")

oFilterCellElement.FilterButton.ToolTipText = oFilterCellElement.FilterOperatorText.Text.Replace(":", "")

oFilterCellElement.FilterOperatorText.Visibility = Telerik.WinControls.ElementVisibility.Collapsed

End If

Catch ex As Exception

' Do nothing

End Try

End Sub

I now use this on all my grids within my current project. It would be nice if something similar was built in. If it is already, then I've missed it in the documentation.

Feel free to offer code improvements or another way.

GridView

answered on 15 Mar 2011

1 answer

129 views

Treeview Refresh

Hi, I'm having an issue refreshing the data in my treeview. Here is the treeview.

'Build Tree View

Private Sub BuildtvOrgan()

tvOrgan.RelationBindings.Add(New RelationBinding("CompanyDepts", Me.DepartmentBindingSource))

tvOrgan.RelationBindings.Add(New RelationBinding("Department_Employee", Me.EmployeeBindingSource))

tvOrgan.RelationBindings.Item(0).DisplayMember = "DeptName"

tvOrgan.RelationBindings.Item(0).ValueMember = "id"

tvOrgan.RelationBindings.Item(0).DataSource = DepartmentBindingSource

tvOrgan.RelationBindings.Item(1).DisplayMember = "FName"

tvOrgan.RelationBindings.Item(1).ValueMember = "id"

tvOrgan.RelationBindings.Item(1).DataSource = EmployeeBindingSource

tvOrgan.DataSource = CompanyBindingSource

tvOrgan.ValueMember = "id"

SetImages(tvOrgan.Nodes)

tvOrgan.ExpandAll()

End Sub

Now, when I modify the underlying data the treeview doesn't change. It does change if I add data to the underlying tables. If I add a new Company.Department.Employee to the datatables the treeview updates, with an expandall(). However if I change department A to now be in department C instead of B it doesn't move until I reload the app. Any idea's anyone? How can I get the treeview to show changes made to the datasource.

Thanks

DropDownList

answered on 15 Mar 2011

2 answers

113 views

Custom Appointment window

Is it possible to replace the appointment window with a custom window where you will have full control?

Best R, Thomas

Scheduler and Reminder

answered on 15 Mar 2011

2 answers

130 views

Chart Y Axis Margin problem

Hi Team,

I m using radchart control in my project.
i m drawing real time chart . my Y axis AutoScale =True
But when i m setting the y axis as max of y axis scale, it is hideing the series line.
How i can give a margin for Max values?

Please refer the attachment.

Thanks and Regards
Saurabh dubey

Chart (obsolete as of Q1 2013)

answered on 15 Mar 2011

5 answers

162 views

Color blending problem

Hello, telerik community :)

While using the color blending mechanism, I noticed that if a rad control is created for the first time after the color blending takes place, that control will not have the blending changes.
In my application, as soon as I open the main form, I apply a theme and then a color blending.

If m_Theme = AvailableThemes.ControlDefault Then

m_CurrentTheme = Telerik.WinControls.ThemeResolutionService.GetTheme("ControlDefault")

name = "ControlDefault"

Else

If Not ThemeLoaded(name) Then

ThemeResolutionService.LoadPackageResource(name & ".tssp")

End If

m_CurrentTheme = Telerik.WinControls.ThemeResolutionService.GetTheme(name)

Telerik.WinControls.ThemeResolutionService.ApplicationThemeName = name

m_CurrentTheme.AddColorBlend(blend.Name, blend.BaseHslColor)

m_CurrentTheme.ThemeProperties(blend.Name) = blend.BlendHslColor

AvailableThemes is an enumeration of theme names. All other themes except ControlDefault are assembly Resources (tssp files).

As soon as the main window of the application is shown, my theme "manager" loads the last used theme and applies a color blending to that theme.

It seems that rad controls, which are not loaded before the color blend, will not get the new colors. RadPageView is even worse, even if it is loaded (in my case, my main form has a RadPageView in stack viewmode), it will only apply the color blending to new RadPageViews of the same view mode (strip or stack).

To successfully apply color bindings in controls that will be created after the initial color blending, I have to add dummy controls (for example, a RadPageView with view mode strip) on my main form's control collection (with size 0,0 show that these controls don't show up) and after the application of color blending, I remove them.

Is this the desired functionality? I thought that color blending would be available to all controls using the theme that has the color blending.

Forgot to mention that I am using the latest dev release of RadControls for WinForms Q3 2010 (2010.3.10.1326).

Themes and Visual Style Builder

answered on 15 Mar 2011