Questions on UI for WinForms Forum

12 answers

1.4K+ views

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.

GridView

answered on 11 May 2017

13 answers

2.2K+ views

Checkbox: Disable the checking of checkbox when enter key is pressed.

When the checkbox is focused and the enter key is pressed, the checkbox then gets checked.
This is an undesired feature, and my client requested that the spacebar only will check and uncheck the checkbox.

How do I change this?

Buttons, RadioButton, CheckBox, etc

answered on 11 May 2017

1 answer

336 views

UI Winforms Update Overflow Error Crashes App

I tried to update Telerik UI for Winforms today to the latest version. Everything builds and the app runs. However, when I navigate to a form that contains Pie Charts, the app crashes with an unhandled exception and I get the below Overflow error.

What changed with the chartview control that would cause this? Is this something I can fix on my end? or do I need to wait for a bug fix release?

System.OverflowException: Overflow error.

at System.Drawing.Graphics.CheckErrorStatus(Int32 status)

at System.Drawing.Graphics.DrawRectangle(Pen pen, Single x, Single y, Single width, Single height)

at Telerik.WinControls.Paint.RadGdiGraphics.DrawRectangle(RectangleF rectangle, Color color, PenAlignment penAlignment, Single penWidth, Brush brush, DashStyle dashStyle, Single[] dashPattern)

at Telerik.WinControls.Paint.RadGdiGraphics.DrawRectangle(RectangleF rectangle, Color color, PenAlignment penAlignment, Single penWidth, DashStyle dashStyle, Single[] dashPattern)

at Telerik.WinControls.Primitives.BorderPrimitiveImpl.DrawRectangle(IGraphics graphics, RectangleF rectangle, Color[] gradientColors, Single width)

at Telerik.WinControls.Primitives.BorderPrimitiveImpl.PaintBorder(IGraphics graphics, Single angle, SizeF scale, RectangleF preferedRectangle)

at Telerik.WinControls.UI.LabelElementDrawPart.Draw()

at Telerik.WinControls.UI.PieLabelElementDrawPart.Draw()

at Telerik.WinControls.UI.PieRenderer.Draw(Object context)

at Telerik.WinControls.UI.ChartArea.Render(Object context)

at Telerik.WinControls.UI.ChartView.Draw(Object context)

at Telerik.WinControls.UI.RadChartElement.PaintElement(IGraphics graphics, Single angle, SizeF scale)

at Telerik.WinControls.RadElement.DoOwnPaint(IGraphics graphics, Single angle, SizeF scale)

at Telerik.WinControls.RadElement.Paint(IGraphics graphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)

at Telerik.WinControls.RadItem.PaintOverride(IGraphics screenRadGraphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)

at Telerik.WinControls.RadElement.PaintChild(RadElement child, IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)

at Telerik.WinControls.RadItem.PaintChild(RadElement child, IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)

at Telerik.WinControls.RadElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)

at Telerik.WinControls.VisualElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)

at Telerik.WinControls.RadElement.Paint(IGraphics graphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)

at Telerik.WinControls.RadItem.PaintOverride(IGraphics screenRadGraphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)

at Telerik.WinControls.RootRadElement.Paint(IGraphics graphics, Rectangle clipRectangle)

at Telerik.WinControls.RadControl.OnPaint(PaintEventArgs e)

at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer)

at System.Windows.Forms.Control.WmPaint(Message& m)

at System.Windows.Forms.Control.WndProc(Message& m)

at System.Windows.Forms.ScrollableControl.WndProc(Message& m)

at Telerik.WinControls.RadControl.WndProc(Message& m)

at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)

at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)

at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

General Discussions

answered on 11 May 2017

3 answers

144 views

RadGridView editing of filtered DataView

I'm writing with regard to a problem I'm encountering when a user edits RadGridView data that has been filtered.

The filtering is being done through a DataView expression, e.g. CONVERT([NumberOfStaffAvailable],'System.Decimal')>=10

The user then edits the NumberOfStaffAvailable field for one of the displayed rows to be less than 10, so that row is no longer valid as part of the filtered recordset.

When the user presses the Enter key a NullReference exception is thrown, the callstack is listed below.

I've tried calling SuspendLayout() and SuspendUpdate() in the CellBeginEdit event, and resuming them in the CellEndEdit event, but with no luck.

I'd be grateful for any advice on how get around this problem,

I'm using WinControls v. 2016.3.1024.40

Thanks and kind regards

James

System.NullReferenceException: Object reference not set to an instance of an object.
at Telerik.WinControls.UI.GridDataCellElement.set_Value(Object value)
at Telerik.WinControls.UI.GridViewEditManager.EndEditCore(Boolean validate, Boolean cancel)
at Telerik.WinControls.UI.GridViewEditManager.EndEdit()
at Telerik.WinControls.UI.GridRowBehavior.ProcessEnterKey(KeyEventArgs keys)
at Telerik.WinControls.UI.GridRowBehavior.ProcessKey(KeyEventArgs keys)
at Telerik.WinControls.UI.BaseGridBehavior.ProcessKey(KeyEventArgs keys)
at Telerik.WinControls.UI.BaseGridBehavior.ProcessKeyDown(KeyEventArgs keys)
at Telerik.WinControls.UI.BaseGridEditor.OnKeyDown(KeyEventArgs keyEventArgs)
at Telerik.WinControls.UI.RadTextBoxEditor.OnKeyDown(KeyEventArgs e)
at Telerik.WinControls.UI.RadTextBoxEditor.TextBoxItem_KeyDown(Object sender, KeyEventArgs e)
at System.Windows.Forms.KeyEventHandler.Invoke(Object sender, KeyEventArgs e)
at Telerik.WinControls.RadItem.OnKeyDown(KeyEventArgs e)
at Telerik.WinControls.UI.RadTextBoxItem.TextBoxControl_KeyDown(Object sender, KeyEventArgs e)
at System.Windows.Forms.Control.OnKeyDown(KeyEventArgs e)
at System.Windows.Forms.Control.ProcessKeyEventArgs(Message& m)
at System.Windows.Forms.Control.ProcessKeyMessage(Message& m)
at System.Windows.Forms.Control.WmKeyChar(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.TextBoxBase.WndProc(Message& m)
at System.Windows.Forms.TextBox.WndProc(Message& m)
at Telerik.WinControls.UI.HostedTextBoxBase.WndProc(Message& message)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

GridView

answered on 11 May 2017

2 answers

273 views

SQL Datasource : Integer to checkbox column

Hi,

I fill my grid with one SQL table which contains an int col "SENT".

Its values are -1 for "OK" and 0 for "Not OK".

By default, the radgridview bind checked = 1 and unchecked = 0.

Is it possible to bind the checkbox column of the radgridview with -1=checked and 0=unchecked ?

Thank you.

GridView

answered on 10 May 2017

2 answers

1.4K+ views

Update Cell Value in CellValidating Event

We have a simple datagrid where the first column contains a Vendor Number and the second is a read-only column containing the name of that vendor. Users can freely enter into the first column, and in the CellValidation event, we verify that the format of what they entered is correct and then lookup the number they entered to populate the second column with the name.

The function looks something like this:

Private Sub ValidateCell(sender As System.Object, e As Telerik.WinControls.UI.CellValidatingEventArgs)

Dim vendNum As String = ""

If e.ColumnIndex = 0 AndAlso Not String.IsNullOrWhiteSpace(e.Value) Then

vendNum = e.Value

'Format the Vendor Number

vendNum = FormatVendorNumber(vendNum)

Me.dgvVendors.CurrentCell.Value = vendNum 'dgvVendors is our data grid

'Find the name of the vendor

e.Row.Cells(1).Value = GetVendorName(vendNum)

End If

End Sub

If a cell enters edit mode and the value is changed, then the value displayed in the cell is not updated with the formatted version. However, if a cell enters edit mode and then leaves edit mode with no changes, the formatted value from our function is applied. For example, if you were to add a new row and type "1" in the cell, our format function would convert that to "00001.00", and if you put a breakpoint in the above code, you would see that both Me.dgvVendors.CurrentCell.Value and the vendNum variable would reflect this formatted value. However, once processing completes, the cell will still read "1" in the UI.

Now, after having done that, if you click the same cell to enter edit mode and then click somewhere else, the same function above will run, only this time the cell in the UI will be updated to display "00001.00" properly. Likewise, if you edit that formatted value and remove a zero, the function will fail to update the value, but if after doing that, you click on the cell and then leave it without making any changes, it will be formatted again and the missing zero will be added back. The validating event handler can only update the cell value if that value was not actually changed during editing.

Note: The last line setting e.Row.Cells(1).Value to the Vendor Name always works. We've tried this syntax to apply our updated Vendor Number to Cells(0), but get the exact same results as using Me.dgvVendors.CurrentCell.Value.

Any idea what's going on here or how to correct it?

GridView

answered on 10 May 2017

2 answers

82 views

GridView are wrong to display RadHostItem

I use RadGridView and have custom cell element.

I set row height = 300.

For custom cell element, i use RadHostItem to create childe
Ex:

protected override void CreateChildElements()

{

base.CreateChildElements();

var label = new Label();

label.Text = "test";

var layout = new TableLayoutPanel();

layout.ApplyDefaultStyles("Master layout");

layout.Dock = DockStyle.Fill;

layout.ColumnCount = 1;

layout.RowCount = 1;

layout.RowStyles.Add(new RowStyle(SizeType.Percent, 100F));

layout.ColumnStyles.Add(new ColumnStyle(SizeType.Percent, 100F));

layout.Controls.Add(label, 0, 0);

layout.AutoScroll();

var child = new RadHostItem(layout) { AutoSizeMode = RadAutoSizeMode.Auto};

Children.Add(child);

}

Result (see the picture in attachments)

Thanks and kind regards

Paul

GridView

answered on 10 May 2017

2 answers

117 views

Problem with inherited Scheduler

Hi,

I have inherited a scheduler like this:

Public Class Test
Inherits RadScheduler

End Class

All works very fine. But i have trouble with themes.

I added a application-wide theme like this:

Dim visualStudio2012LightTheme1 = New Themes.VisualStudio2012LightTheme()
ThemeResolutionService.ApplicationThemeName = visualStudio2012LightTheme1.ThemeName

The SchedulerNavigator (also in my Form) changed its style, but my inherited scheduler do not. The scrollbar on the right side has the new theme, and the appointment form and all other "subcontrols".

More details in screenshot.

Can you help me?

Scheduler and Reminder

answered on 10 May 2017

2 answers

124 views

DateTimePicker selection

Currently if you select the control by clicking on it - it makes active editable part of the date exactly where you clicked (for ex. yyyy part of the mm/dd/yyyy date). Users want to have selection to be always in the start of the date not tied to place where they clicked . How could be selection be moved to the first part of the date (mm part in our case)?

Calendar, DateTimePicker, TimePicker and Clock