Questions on UI for WinForms Forum

2 answers

155 views

RadGridView filter row takes a long time to filter when the grid has many rows.

I have a grid with 60,000 records and I have the filter line at the top of the grid. When a user writes to the filter line, it takes a few minutes for the grid to be filtered.

Telerik version is 2021.2.511.40.

Are there any performance improvements in newer versions? Is there a guarantee that if we update the Telerik version this problem will be resolved?

Form

General Discussions

GridView

answered on 13 Jan 2025

2 answers

69 views

Add Grpops to List and CloseButton in Search Panel

Hello!
1. How to correctly implement adding unique groups to the list and deleting non-existent ones?
The GroupSummaryEvaluate event does not occur when deleting the last entry in a group (deleting this group). That is, it is necessary for the ListBox to display the same groups as in the Grid.

lbGroups.DataSource = lstGroups.ToList

Public Class Form1
Dim lstGroups As New SortedSet(Of String)
Private Sub grdURLs2_GroupSummaryEvaluate(sender As Object, e As GroupSummaryEvaluationEventArgs) Handles grdURLs2.GroupSummaryEvaluate
        If lstGroups.Add(e.Value) Then
' code
        End If
End Sub
End Class

2. How to remove the Close button from the Search Bar?

For Each row In grdURLs2.TableElement.VisualRows
    If TypeOf row Is GridSearchRowElement Then
        Dim searchRow = TryCast(row, GridSearchRowElement)
        searchRow.SearchCellElement.CloseButton.Visibility = False
        Exit For
    End If
Next

Doesn't work.

Thank you!

GridView

updated answer on 12 Jan 2025

2 answers

145 views

Export Spreadsheet with Sortable Excel Table

Hello,

I am trying to export a spreadsheet utilizing RadSpreadProcessing but have run up against a wall. Specifically, I want the exported excel file to contain a sortable table but have found no way of achieving this. Is this possible? Any help would be appreciated. Thanks

Update: I have discovered sorting can be achieved using a filter, but I would still like the exported data to be in a table.

Spreadsheet

answered on 27 Dec 2024

1 answer

92 views

Tab positioning in RadRibbonBar (Positionnement de l'onglet dans la RadRibbonBar)

Hello,

RadRibbonBar avec le thème Fluent (RadRibbonBar with Fluent theme)

En ajoutant la commande pour faire disparaitre le menu, l'onglet se positionne au début.

(By adding the command to make the menu disappear, the tab is positioned at the beginning.)

CAST(THIS-OBJECT:RadRibbonBar:GetChildAt(0):GetChildAt(5), Telerik.WinControls.UI.RadApplicationMenuButtonElement):Visibility = Telerik.WinControls.ElementVisibility:Hidden.

Si je change de thème (Desert) l'onglet se positionne pas au début (comme sur le thème Fluent).

(If I change the theme (Desert), the tab is not positioned at the beginning (as on the Fluent theme).)

Best regards

RibbonBar

answered on 06 Dec 2024

2 answers

133 views

Issues when trying to export a page from RadPdfViewer directly to a Bitmap, without saving the file to the computer.

I have this code, and I just want to export all pages or a specific page from the loaded PDF in the RadPdfViewer, without saving the file to the computer.

The function RadPdfViewer.ExportPage returns a Bitmap, but when I assign the result of this function to a new variable of type Bitmap, an error occurs.

'1º Option - Work
For i As Integer = 1 To RadPdfViewer1.Document.Pages.Count
Dim guid As Guid = Guid.NewGuid

RadPdfViewer1.ExportPage(i, "C:\temp\" & guid.ToString() & ".pdf", 1, True, ImageFormat.Png)

Dim bitmap As Bitmap = New Bitmap("C:\temp\" & guid.ToString() & ".pdf")

Dim reader As BarcodeReader = New BarcodeReader With {
.AutoRotate = True,
.TryInverted = True
}

Dim result As Result = reader.Decode(bitmap)

If result Is Nothing Then Continue For

Dim decoded As String = result.ToString().Trim()

If decoded Is Nothing Then Continue For

If decoded <> TextBox1.Text Then TextBox1.Text = TextBox1.Text & vbNewLine & vbNewLine & decoded

bitmap.Dispose()
My.Computer.FileSystem.DeleteFile("C:\temp\" & guid.ToString() & ".pdf")
Next

'2 Option - Dont Work
Dim bitmap As Bitmap = RadPdfViewer1.ExportPage(1, 1, False, ImageFormat.Png)

'3º Option - Dont Work
For Each bitmap As Bitmap In RadPdfViewer1.ExportPages(1, False, ImageFormat.Bmp)
Dim reader As BarcodeReader = New BarcodeReader With {
.AutoRotate = True,
.TryInverted = True
}

Dim result As Result = reader.Decode(bitmap)

If result Is Nothing Then Continue For

Dim decoded As String = result.ToString().Trim()

If decoded Is Nothing Then Continue For

If decoded <> TextBox1.Text Then TextBox1.Text = TextBox1.Text & vbNewLine & vbNewLine & decoded
Next

Accessibility

Form

General Discussions

PdfViewer and PdfViewerNavigator

answered on 04 Dec 2024

1 answer

63 views

Item appears duplicated in the popup when selected Desert Theme

Hello,

How do i make the item appear only once in the popup when the theme is Desert?

1 - Without Theme

2 - Desert Theme

Code:

List<TecnicoServicoInfo> listaTecnicos = new List<TecnicoServicoInfo>();

TecnicoServicoInfo tec = new TecnicoServicoInfo();
tec.CdFuncionario = -1;
tec.DsFuncionario = " ";
TecnicoServicoInfo tec1 = new TecnicoServicoInfo();
tec1.CdFuncionario = 80;
tec1.DsFuncionario = "robsu";
TecnicoServicoInfo tec2 = new TecnicoServicoInfo();
tec2.CdFuncionario = 1558;
tec2.DsFuncionario = "joelssu";
TecnicoServicoInfo tec4 = new TecnicoServicoInfo();
tec4.CdFuncionario = 333;
tec4.DsFuncionario = "TESTE UM NOME MAIOR QUE TODOS OS OUTROS PARA VER O TEMA";
listaTecnicos.Add(tec);
listaTecnicos.Add(tec2);
listaTecnicos.Add(tec1);
listaTecnicos.Add(tec4);
listaTecnicos = listaTecnicos.OrderBy(x => x.DsFuncionario).ToList();

ddlTecnico.DropDownStyle = RadDropDownStyle.DropDown;
ddlTecnico.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
ddlTecnico.DropDownListElement.AutoCompleteSuggest.SuggestMode = SuggestMode.Contains;
ddlTecnico.Items.Clear();

ddlTecnico.DescriptionTextMember = "DsFuncionario";
ddlTecnico.ValueMember = "CdFuncionario";
ddlTecnico.DisplayMember = "DsFuncionario";

ddlTecnico.DataSource = listaTecnicos;

ddlproxima.DropDownStyle = RadDropDownStyle.DropDown;
ddlproxima.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
ddlproxima.DropDownListElement.AutoCompleteSuggest.SuggestMode = SuggestMode.Contains;
ddlproxima.Items.Clear();

ddlproxima.DescriptionTextMember = "DsFuncionario";
ddlproxima.ValueMember = "CdFuncionario";
ddlproxima.DisplayMember = "DsFuncionario";

ddlproxima.DataSource = listaTecnicos;

ddlproxima.AutoSizeItems = false;
ddlproxima.AutoSize = false;

Telerik version: 23.2.718

Thank You!

DropDownList

Themes and Visual Style Builder

answered on 03 Dec 2024

2 answers

84 views

DropDown Dynamic loadDate

I had a question about the Dropdown element, I saw how to search for it, but I couldn't find it for dynamic
    public SearchWarehouseNP()
    {
        InitializeComponent();
        dropdownSettlement.DropDownStyle = RadDropDownStyle.DropDown;
        dropdownSettlement.AutoCompleteMode = AutoCompleteMode.Suggest;

        dropdownSettlement.DropDownListElement.AutoCompleteSuggest = new CustomAutoCompleteSuggestHelperUpdate(
            dropdownSettlement.DropDownListElement,
            async query =>
            {
                if (string.IsNullOrWhiteSpace(query) || query.Length < 3)
                    return Enumerable.Empty<DescriptionTextListDataItem>();

                var response = await _searchSettlementService.GetCityData(query);
                if (response.success && response.data.Any())
                {
                    return response.data.First().Addresses.Select(a => new DescriptionTextListDataItem
                    {
                        Text = $"{a.MainDescription} ({a.Area})",
                        Value = a.MainDescription,
                        DescriptionText = a.Area
                    });
                }

                return Enumerable.Empty<DescriptionTextListDataItem>();
            }
        );

        dropdownSettlement.SelectedIndexChanged += (s, e) =>
        {
            if (dropdownSettlement.SelectedItem is DescriptionTextListDataItem selectedItem)
            {
                Console.WriteLine($"Выбрано: {selectedItem.Text} ({selectedItem.Value})");
            }
        };
    }
}
The problem is that the data is not stored in Items

Console.WriteLine empty


using Telerik.WinControls.UI;

namespace NovaPostOrderManager.Helpers;

public class CustomAutoCompleteSuggestHelperUpdate : AutoCompleteSuggestHelper
{
    private readonly Func<string, Task<IEnumerable<DescriptionTextListDataItem>>> _fetchDataAsync;
    private CancellationTokenSource _cts = new();

    public CustomAutoCompleteSuggestHelperUpdate(RadDropDownListElement owner, Func<string, Task<IEnumerable<DescriptionTextListDataItem>>> fetchDataAsync)
        : base(owner)
    {
        _fetchDataAsync = fetchDataAsync;
    }

    protected override async void SyncItemsCore()
    {
        // Текущий текст из поля ввода
        string currentInput = Filter;

        // Проверяем, нужно ли загружать данные
        if (string.IsNullOrWhiteSpace(currentInput) || currentInput.Length < 3)
        {
            DropDownList.ListElement.Items.Clear();
            DropDownList.ClosePopup();
            return;
        }

        // Отменяем предыдущий запрос
        _cts.Cancel();
        _cts = new CancellationTokenSource();

        try
        {
            // Задержка перед началом запроса
            await Task.Delay(300, _cts.Token);

            // Загружаем данные
            var items = await _fetchDataAsync(currentInput);

            _cts.Token.ThrowIfCancellationRequested();

            DropDownList.ListElement.BeginUpdate();
            DropDownList.ListElement.Items.Clear();

            // Добавляем элементы в выпадающий список
            foreach (var item in items)
            {
                DropDownList.ListElement.Items.Add(item);
            }

            DropDownList.ListElement.EndUpdate();

            if (DropDownList.ListElement.Items.Count > 0)
            {
                DropDownList.ShowPopup(); // Показываем список, если есть элементы
            }
            else
            {
                DropDownList.ClosePopup();
            }
        }
        catch (TaskCanceledException)
        {
            // Запрос был отменён — игнорируем
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Ошибка загрузки данных: {ex.Message}");
        }
    }

    protected override bool DefaultFilter(RadListDataItem item)
    {
        if (item is not DescriptionTextListDataItem descriptionItem)
            return base.DefaultFilter(item);

        return descriptionItem.Text.Contains(Filter, StringComparison.CurrentCultureIgnoreCase) ||
               descriptionItem.DescriptionText.Contains(Filter, StringComparison.CurrentCultureIgnoreCase);
    }
}

DropDownList

answered on 29 Nov 2024

1 answer

64 views

Layout change color

The problem is that the data is not stored in Items

using Telerik.WinControls.UI;

namespace NovaPostOrderManager.Helpers;

public class CustomAutoCompleteSuggestHelperUpdate : AutoCompleteSuggestHelper
{
private readonly Func<string, Task<IEnumerable<DescriptionTextListDataItem>>> _fetchDataAsync;
private CancellationTokenSource _cts = new();

public CustomAutoCompleteSuggestHelperUpdate(RadDropDownListElement owner, Func<string, Task<IEnumerable<DescriptionTextListDataItem>>> fetchDataAsync)
: base(owner)
{
_fetchDataAsync = fetchDataAsync;
}

protected override async void SyncItemsCore()
{
// Текущий текст из поля ввода
string currentInput = Filter;

// Проверяем, нужно ли загружать данные
if (string.IsNullOrWhiteSpace(currentInput) || currentInput.Length < 3)
{
DropDownList.ListElement.Items.Clear();
DropDownList.ClosePopup();
return;
}

// Отменяем предыдущий запрос
_cts.Cancel();
_cts = new CancellationTokenSource();

try
{
// Задержка перед началом запроса
await Task.Delay(300, _cts.Token);

// Загружаем данные
var items = await _fetchDataAsync(currentInput);

_cts.Token.ThrowIfCancellationRequested();

DropDownList.ListElement.BeginUpdate();
DropDownList.ListElement.Items.Clear();

// Добавляем элементы в выпадающий список
foreach (var item in items)
{
DropDownList.ListElement.Items.Add(item);
}

DropDownList.ListElement.EndUpdate();

if (DropDownList.ListElement.Items.Count > 0)
{
DropDownList.ShowPopup(); // Показываем список, если есть элементы
}
else
{
DropDownList.ClosePopup();
}
}
catch (TaskCanceledException)
{
// Запрос был отменён — игнорируем
}
catch (Exception ex)
{
Console.WriteLine($"Ошибка загрузки данных: {ex.Message}");
}
}

protected override bool DefaultFilter(RadListDataItem item)
{
if (item is not DescriptionTextListDataItem descriptionItem)
return base.DefaultFilter(item);

return descriptionItem.Text.Contains(Filter, StringComparison.CurrentCultureIgnoreCase) ||
descriptionItem.DescriptionText.Contains(Filter, StringComparison.CurrentCultureIgnoreCase);
}
}

LayoutControl

updated question on 29 Nov 2024

1 answer

81 views

CheckedListBox in PropertyGrid

Hello Support Team.

I have an application with a PropertyGrid in C# with WinForms. Is it possible to have a CheckedListBox to allow multiple selections in the PropertyGrid?

Thank you in advance.

PropertyGrid

answered on 28 Nov 2024

1 answer

108 views

Editable DropDown list in PropertyGrid with a not-listed value

Hello, support team.

I have an application with a PropertyGrid in C# with WinForms. In this PropertyGrid I need to display a drop-down list with a predefined value list, but I need to allow also the user be able to edit a not listed value.

Thank you in advance

PropertyGrid

answered on 28 Nov 2024