Questions on UI for WinForms Forum

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GridView with self referencing hierarchy problem, child rows not shown after adding programmaticaly

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.

GridView

answered on 22 Apr 2024

0 answers

2 views

GridView handling of properties with Browsable(false) attribute

Hello,

I have question about GridView handling of properties with Browsable(false) attribute. It's expected that when I add this attribute to some property, automatic generation of columns will ignore it. But why when I add this column manually, that column is empty. Is it a bug? I think that attribute means that should not be displayed in PropertyGrid, but it doesn't prevent to read / write property. It's not problem for me, that's just question, I ran into it during some other tests.

But, maybe it's not bug but expected behavior, but when I add this attribute to property used as ID for self referencing hierarchy, program freezes on startup, and I think this is a bug, isn't it?

GridView

asked on 21 Apr 2024

0 answers

2 views

GridView selection mode similar to RowHeaderSelect in WinForms DataGridView

Hello,

I am wondering if GridView really doesn't have selection mode similar to RowHeaderSelect in WinForms DataGridView, where I can select individual cells clicking on those cells or I can select row by clicking row header cell. I have read documentation and forum, and I am also wondering if somebody else really doesn't have the same question.

For example, I want to delete row only if row is selected, not if only few cells are selected in multiple rows, it's strange behavior for me. Or, second use case, I have more Copy operations depending on selection scope, if row is selected, whole data object is copied to clipboard, if individual cells are selected, just those data as text are copied, if only cells from specific columns are selected, one parameter sub-object is copied etc.

Now, I can get used to this new behavior, but users are used to DataGridView behavior, I think they will be little bit confused. Or, I know when I click to row header cell, all cells in that row are selected (also the hidden ones), so I can check if all cells in row are selected and then consider that row as selected, but it will be more processing.

GridView

updated question on 21 Apr 2024

0 answers

4 views

HTML hyperlink in cell to fire C# event

I need to create a grid that looks like this:

In the upper right there is an X that need to be a hyperlink which fires a C# event. I'm preparing the data for the grid like this:

foreach (var item in data)
{
item.Name = $"<html>{item.Name} {item.Acct}{item.TicklerDesc}</html>";
item.TicklerDate = $"<html>{string.Concat(Enumerable.Repeat(" ", 22))}X{item.TicklerDate}</html>";
}

As it stands now the X is useless. The questions is: How do I make it a hyperlink (or fake equivalent) so that I can fire a C# event?

Thanks

Carl

GridView

asked on 19 Apr 2024

0 answers

7 views

Can't change back color of RadGirdView from other form

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.

I've tried getting the CellElement and assigning styling there but that doesn't work either.

GridView

asked on 18 Apr 2024

1 answer

98 views

GridviewDateTimeColumn Remove or disable Clear button from calendar

Hi
I am using gridviewdatetime column in my gridview (winforms). When user click the cell The calendar popup to select the date. The calendar control have two default button 1. Clear 2. Today. I want to diable or remove the Clear button from calendar popup.
Please reply (Urgent)

GridView

answered on 15 Apr 2024

2 answers

29 views

RadGridView WinForms missing selected cells

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.

GridView

answered on 12 Apr 2024

1 answer

12 views

RadGridView - Copy Performance Issue

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);
}

GridView

answered on 11 Apr 2024

5 answers

19 views

key pressed Gridview UI is Freezing

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)

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