I am calling a panel from another form so I can re-use it without having duplicate code. This panel has a RadViewGrid, but because it is called outside of its parent form it doesn't seem to call the CellFormatting handle. I am trying to style the cells in code, but backcolor doesn't seem to do anything

'Create new form to display pnlPayment
 Dim FormPayment As Form = New Form
FormPayment.Size = New Size(1070, 652)
FormPayment.Name = "FormPayment"
FormPayment.StartPosition = FormStartPosition.CenterScreen
FormPayment.FormBorderStyle = FormBorderStyle.FixedDialog
FormPayment.ControlBox = False
FormPayment.Controls.Add(FrmCashRegister.pnlPayment)

'dynamically find this. can also be done with FrmCashRegister.pnlPayment.Visible = true but I wrote it like this to be sure and to make my life hard
Dim paymentpanel() As Control = FormPayment.Controls.Find("pnlPayment", False).

paymentpanel(0).Visible = True
FrmCashRegister.RadGridViewPayment.AutoSizeRows = True
FrmCashRegister.RadGridViewPayment.EnableAlternatingRowColor = True
For Each row As Telerik.WinControls.UI.GridViewRowInfo In FrmCashRegister.RadGridViewPayment.Rows
    For Each cell In row.Cells
        cell.Style.DrawFill = True
        cell.Style.ForeColor = Color.White 'works
        cell.Style.BackColor = Color.Blue 'doesn't work
    Next
Next

The cell.Style.ForeColor works, but cell.Style.BackColor does not.

Hello,

I have two problems with selfrefencing hierarchy in GridView. First, my test application is related to this thread, just for info and context, but I am asking question in new thread, as it was recommended to me, and I think this is separate problem not related to original design question.

https://www.telerik.com/forums/gridview---design-of-parameter-editor-with-subitems

I have created more realistic test application (TelerikTestReal in attached project) with new data structures for self referencing hierarchy binding. I can see desired output after program startup. When I add new main item programatically, GridView shows it properly. But, when I change test type of main item and subitems are changed, deleted child rows disappear, but newly added are not shown, as you can see on animation below. After some debugging, I see child rows are added to BindingList bound to DataSource of GridView, I also see ListChanged event of BindingList is properly fired, but GridView doesn't show new child rows. I can show them by calling ResetBindings() method of BindingList. What can be the problem?

The second problem is that I cannot close program after call to ResetBindings() method, I can click close button manytimes, but nothing happens.

Hi, 

I'm using RadGridView version 2022.1.222.40.

When the data table I'm using has a lot of data (15.000 for example), when I select an entire column, the cells in SelectedCells collection are normally less than 15.000 (it could be 14996 or 14997) in the SelectionChanged event. With less than 10.000 it seems that works correctly. 

Is there a bug for selected cells when the RadGridView shows more than 10.000 elements?

Regards, 

Evaristo Cuesta.

Hi!

I have a RadGridView (v2022.1.222.40) with a high amount of elements (~90000) and when trying to copy a column I see that the Copying is taking too long. Even if I do a dummy code processing the data.

I cancel all the formats except DataFormats.Text, and it still takes too much time.

I have thought about canceling all the formats and saving the data in a variable instead of the clipboard but if I cancel everything, the Pasting event won't be triggered later... Any suggestion?

Here is my code:

private void gridView_Copying(object sender, GridViewClipboardEventArgs e)
{
    if (e.Format != DataFormats.Text)
    {
        e.Cancel = true;
        return;
    }

    // Do some dummy code

    // Save it in the Clipboard
    e.DataObject.SetData(nameof(MyCustomModel), items);
}

using System.Windows.Forms;

namespace testGridViewKeyPress
{
    public partial class RadForm2 : Telerik.WinControls.UI.RadForm
    {
        private int count_;
        public RadForm2()
        {
            InitializeComponent();

            count_ = 0;
        }

        protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
        {
            count_++;
            radLabel1.Text = count_.ToString();

            radGridView2.BeginUpdate();
            radGridView2.Rows.Clear();
            //I Want to Process Row Clear And Add
            radGridView2.EndUpdate();

            return true;
        }
    }
}

When I hold down the key, I want to clear the row of the GridView and add a new row.

However, when the number of columns increases, even if rows work is performed between BeingUpdate() and EndUpdate(),

All UI is not highlighted or updated.

If the control needs processing when in the press state like this, shouldn't I use gridview?

Or, if there is another solution, please let me know.

+What I want is for all UI to update and operate when a key is pressed.

+My telerik version 2021.3.914.40(Dev)

I like to display data like above . Each row's data type could be decimal, integer, or string. Thanks!

Hello,

I've created a custom cell in a radgridview so that I can in one column either display a RadDropDownListElement or a RadTextBoxControlElement depending on if the tag of the row has a datatable or not. If it has a datatable it will show the dropdown, otherwise it shows the textbox.

This I've done pretty much according to this tutorial.

https://docs.telerik.com/devtools/winforms/controls/gridview/cells/creating-custom-cells#custom-group-cell-example

However, my problem is that the selected index changed event on the dropdown is triggered too early, i.e. before all data has been loaded. Is there a way to get around this? I would like that the selected index changed event only kicked in if all the data of the form has been loaded. This I usually achieve by checking if a flag, e.g. 'IsInitiated', is true in the  beginning of the Sub. But cannot seem to reach such a flag from the custom cell class.

Hello,

I would like to ask for help with designing parameter editor with subitems. I have editor of test items, each item has some parameters and tolerances (Min, Max). Standard tests have just main tolerances, but some tests have also subitems. More precisely, if test has subitems, only subitems have tolerances, main tolerances are not used. Columns for items and subitems are almost the same, items have parameters and subitems don't have any parameters, but there is just a name of subitem instead of test type of parent item. So first attempt of editor looks like this:

One small question to this solution, how can I show "+" only if there are some subitems?

But I am not satisfied with that design, subitems have own border, own column headers, it's little bit confusing and not very clear. I know it's standard way of master-detail views, but in this case, I would prefer design similar to self referencing hierarchy, because columns are almost the same, just some cells are empty and I have name of subitem name instead of test type.

I have made a second test with selfrefencing and changed the screenshot a little bit to show you what I am trying to achieve. Is it possible to have view similar to this?

I think I can do it with some modified data structures specialized for editor, I can use nullable properties for tolerances and parameters to hide certain cells, handle some events to have those empty cells readonly, maybe it would be tricky to show indented subitem name in test type combo box column, but I think this solution would be a little bit ugly. Is there any better way to do this?

I have attached my test project for tests.

Hi!

When using CopyingCellClipboardContent the event is fired x3 times in each cell (once for each supported format). So if I have selected 5 cells the copy will trigger the event 15 times. Is there any kind of event for multiple copies?