Questions on UI for WinForms Forum

1 answer

2.1K+ views

Hi.

After a date is picked I want to delete it and set the value to null on the data bound item.

The NullableValue is set to null/Nothing:

 Me.DateRadDateTimePicker.NullableValue = Nothing

The Value property is bound to an entity's nullable date field:

 Me.DateRadDateTimePicker.DataBindings.Add(New System.Windows.Forms.Binding("Value", Me.binder, "Date", True))

If I select the date text and delete it, the entity still has a 01/01/0001 date value. However, the null text correctly displays in the picker.

I've even tried to manually set the null date (in three different ways!) based on the empty text but to no avail:

Dim dtp As RadDateTimePicker = ctrl
If dtp.Text = "" Then
  dtp.NullableValue = Nothing
  dtp.DateTimePickerElement.SetToNullValue()
  dtp.Value = Nothing
End If

What am I missing?

DateTimePicker

answered on 23 Jun 2021

2 answers

446 views

After 2021.2.505.1 update, VS 2019 stops responding WinForms Converter extension?

I'm getting the following error every time I load any project in VS 2019 (16.9.4)

"Visual Studio stopped responding for 12 seconds. Disabling the extension Progress Telerik WinForms Converter 2021.2.505.1 might help."

See attached image of error.

How to resolve?

Cheers, Rob.

EDIT: for any project, WPF, UWP, etc. (not just WinForms)

Visual Studio Extensions

updated answer on 23 Jun 2021

1 answer

150 views

radgridcolumn chooser

hi,

i use a radgridcolumn chooser related to a radgrid with 2019 radtheme

is there any way to change the font used programatically

thx a lot...

GridView

answered on 22 Jun 2021

9 answers

430 views

RadWizard

Hello

I have version Q3 2010 for winforms
But I couldn't find RadWizard Control in Toolbox....

let me know Radwizard is Avoilable for Q3 2010 or not....?

Thanks

Wizard

answered on 21 Jun 2021

2 answers

169 views

What is the max value for RadChartView CategoricalDataPoint?

I add datapoints to the RadChartView using CategoricalDataPoints. The values can be quite large and then I get the following error:

Value was either too large or too small for a decimal.

Then I did this test:

radChartView->Series[0]->DataPoints->Add(gcnew Telerik::Charting::CategoricalDataPoint(Decimal::ToDouble(Decimal::MaxValue), 0));

I still get the exception: Value was either too large or too small for a decimal.

What is the max value that can be set?

ChartView

answered on 18 Jun 2021

2 answers

168 views

Custom Tokenizer in AutoCompleteBox

Hi, just a question, it is feasible to use a custom tokenizer for the autocompletebox in order to compose the text blocks?

My tokenizer currently supports a vast variety of "quoted" parts, escape sequences and separators thus would be difficult to use just separators, because if separator is , then the quoted text "Hello, World", will be considered 2 blocks instead of 1.

Best Regards

Andrea

AutoCompleteBox

answered on 18 Jun 2021

5 answers

866 views

Sneaking password in a textbox

Hi

In winforms, is it possible to have the little "eye" on the right of a RadTextbox to let the user sneak the password?

I have found https://www.telerik.com/support/kb/winforms/tools/details/showpassword-button-for-radtextbox-with-textmode-password?_ga=2.217538326.1876351049.1570721637-455345866.1542726605 which is under winforms but seems to apply to ASP.Net/Ajax.

TextBox

answered on 18 Jun 2021

1 answer

121 views

Alternating colors (red and yellow) for data points in range bar series

Hi ,

I am trying to create a range bar series . In that data points should be alternating colors red and yellow only . I found one from chart grid : https://docs.telerik.com/devtools/winforms/controls/chartview/features/chart-grid but not for data points . Are there any properties to achieve this?

Code attached:

private void LoadBarChart()
        {

            this.radChartView1.AreaType = ChartAreaType.Cartesian;
            this.radChartView1.ChartElement.AngleTransform = 90;
            RangeBarSeries rangeBarSeries = new RangeBarSeries("End Time", "Start Time", "Summarization Date");
            rangeBarSeries.CombineMode = ChartSeriesCombineMode.None;

            this.radChartView1.ChartElement.View.Margin = new Padding(40, 40, 40, 100);

            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 14, DateTime.Now.TimeOfDay.TotalMinutes + 10, "5/17/2021"));
            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 7, DateTime.Now.TimeOfDay.TotalMinutes + 5, "5/17/2021"));
            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 4, DateTime.Now.TimeOfDay.TotalMinutes + 2, "5/17/2021"));


            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 30, DateTime.Now.TimeOfDay.TotalMinutes + 10, "5/18/2021"));
            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 7, DateTime.Now.TimeOfDay.TotalMinutes + 5, "5/18/2021"));

            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 4, DateTime.Now.TimeOfDay.TotalMinutes + 2, "5/19/2021"));

            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes - 89, DateTime.Now.TimeOfDay.TotalMinutes - 100, "5/20/2021"));
            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 7, DateTime.Now.TimeOfDay.TotalMinutes + 5, "5/20/2021"));

            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes - 79, DateTime.Now.TimeOfDay.TotalMinutes - 90, "5/21/2021"));
            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 7, DateTime.Now.TimeOfDay.TotalMinutes + 5, "5/21/2021"));

            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 14, DateTime.Now.TimeOfDay.TotalMinutes + 10, "5/22/2021"));
            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 7, DateTime.Now.TimeOfDay.TotalMinutes + 5, "5/22/2021"));


            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 14, DateTime.Now.TimeOfDay.TotalMinutes + 10, "5/23/2021"));
            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 7, DateTime.Now.TimeOfDay.TotalMinutes + 5, "5/23/2021"));

            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 14, DateTime.Now.TimeOfDay.TotalMinutes + 10, "5/25/2021"));
            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 7, DateTime.Now.TimeOfDay.TotalMinutes + 5, "5/24/2021"));

            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 14, DateTime.Now.TimeOfDay.TotalMinutes + 10, "5/26/2021"));
            rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 7, DateTime.Now.TimeOfDay.TotalMinutes + 5, "5/26/2021"));


            CategoricalAxis horizontalAxis = new CategoricalAxis();

           // horizontalAxis.Title = "Summarization Days";
            horizontalAxis.ClipLabels = false;
            horizontalAxis.LabelRotationAngle = -90;
            horizontalAxis.LabelFitMode = AxisLabelFitMode.Rotate;
            horizontalAxis.BackColor = Color.Red;
            horizontalAxis.PlotMode = AxisPlotMode.BetweenTicks;
            horizontalAxis.LabelFormatProvider = new MyFormatProviderX();
            rangeBarSeries.HorizontalAxis = horizontalAxis;

            ChartTooltipController tooltipController = new ChartTooltipController();
            tooltipController.DataPointTooltipTextNeeded += tooltipController_DataPointTooltipTextNeeded;
            this.radChartView1.Controllers.Add(tooltipController);

           // rangeBarSeries.ShowLabels = true;
            this.radChartView1.Series.Add(rangeBarSeries);
            radChartView1.ShowToolTip = true;
            rangeBarSeries.CombineMode = ChartSeriesCombineMode.None;

    

            rangeBarSeries.VerticalAxis.LabelFormatProvider = new MyFormatProvider();
            rangeBarSeries.VerticalAxis.Title = "Time of the day";
            rangeBarSeries.VerticalAxis.ClipLabels = false;
            rangeBarSeries.VerticalAxis.LabelRotationAngle = -90;
            rangeBarSeries.VerticalAxis.LabelFitMode = AxisLabelFitMode.Rotate;
           

            LinearAxis verticalAxis = radChartView1.Axes.Get<LinearAxis>(1);
            verticalAxis.Minimum = 0; //Minutes 0:00
            verticalAxis.Maximum = 1380; //Minutes 23:00
            verticalAxis.MajorStep = 60; //60 minutes in an hour
         

            CartesianArea area = this.radChartView1.GetArea<CartesianArea>();
            area.ShowGrid = true;

            CartesianGrid grid = area.GetGrid<CartesianGrid>();
            grid.DrawVerticalStripes = true;
            grid.DrawHorizontalStripes = false;
        }


        private void tooltipController_DataPointTooltipTextNeeded(object sender, DataPointTooltipTextNeededEventArgs e)
        {
            RangeDataPoint dp = e.DataPoint as RangeDataPoint;
            if (dp != null)
            {
                e.Text = dp.High + " " + dp.Low;
            }
        }

    }
}

public class MyFormatProvider : IFormatProvider, ICustomFormatter
{
    public object GetFormat(Type formatType)
    {
        return this;
    }
    public string Format(string format, object arg, IFormatProvider formatProvider)
    {
        int totalminutes = Convert.ToInt32(arg);

        TimeSpan timeSpan = TimeSpan.FromMinutes(totalminutes);

        return timeSpan.ToString(@"hh\:mm");
    }
}

ChartView

answered on 16 Jun 2021

1 answer

88 views

CustomFormatter first takes in non relevant values even though min ,max and major step are set

Hi ,

I am defining the vertical axis' set of axis labels by defining min max and major step . Even though i set it , it takes some non relevant values like 100,200....1128.5 etc before starting from 0,60,120... Code attached:

            rangeBarSeries.VerticalAxis.LabelFormatProvider = new MyFormatProvider();            
            LinearAxis verticalAxis = chart.View.Axes.Get<LinearAxis>(1);
            verticalAxis.Minimum = 0; //Minutes 0:00
            verticalAxis.Maximum = 1380; //Minutes 23:00
            verticalAxis.MajorStep = 60; //60 minutes in an hour

   public class MyFormatProvider : IFormatProvider, ICustomFormatter
    {
        public object GetFormat(Type formatType)
        {
            return this;
        }
        public string Format(string format, object arg, IFormatProvider formatProvider)
        {
         
                int totalminutes = Convert.ToInt32(arg);
            TimeSpan timeSpan = TimeSpan.FromMinutes(totalminutes);
            return timeSpan.ToString(@"hh\:mm");
        }
    }

ChartView

answered on 16 Jun 2021

2 answers

210 views

Need to change height

Hi,

I need to change the height of popup as shown in attached image file, when the dropdown arrow is clicked and popup is shown along with "Close" button.

I have implemented this control exactly as per CustomDropDownList code mentioned in the link:

https://www.telerik.com/support/kb/winforms/dropdown-checkeddropdown-and-list/details/multi-select-drop-down-list

Please help me with the modification needed.

I do not want to use AutoSize, as the DataSource of dropdown is huge.

Thanks

Nishant

DropDownList

answered on 16 Jun 2021