e.CellElement.Value in UI for WinForms

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e.CellElement.Value

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This is a migrated thread and some comments may be shown as answers.

Andi asked on 22 Jun 2020, 12:11 PM

Hi

I have the following code ..

Private Sub RadGridView1_CellFormatting (sender As Object, e As UI.CellFormattingEventArgs) Handles RadGridView1.CellFormatting

If e.CellElement.ColumnInfo.Name = "Document" Then

e.CellElement.ForeColor = Color.Red

Else

e.CellElement.ResetValue (LightVisualElement.ForeColorProperty, ValueResetFlags.Local)

End if

If e.CellElement.ColumnInfo.Name = "Document" Then

If e.CellElement.RowInfo.Cells ("Document"). Value> = RadTextBox4.Text And e.CellElement.RowInfo.Cells ("Document"). Value <= RadTextBox5.Text Then

e.CellElement.DrawFill = True

e.CellElement.BackColor = Color.Yellow

e.CellElement.ForeColor = Color.Blue

e.CellElement.GradientStyle = Telerik.WinControls.GradientStyles.Radial

e.CellElement.Font = New Font ("Book Antiqua", 12.75 !, FontStyle.Bold)

End if

End Sub

works perfectly !

Now I would like to add only the sum in the "Document"

column that only e.CellElement.BackColor = Color.Yellow or also e.CellElement.GradientStyle = Telerik.WinControls.GradientStyles.Radial have.

I would like to have this sum displayed in radlabel3.text, how do I get it there?

8 Answers, 1 is accepted

answered on 24 Jun 2020, 12:34 PM

Hello Andi,

Thank you for the provided code snippet.

According to it, I suppose that the "Document" column contains numeric values and you color some rows in RadGridView based on some conditions. If I understand you correctly you would like to get the sum of rows that are colored in yellow and have GradientStyles.Radial. To do so, I can suggest to iterate the cells outside the formatting event and use the same condition that you use in the CellFormatting event to calculate the sum.

Note, since RadGridView uses UI virtualization for its cells the CellFormatting event should be fired many times and it should be used for formatting purposes only. This is why if you want to make some calculations it is suitable to do it outside this event, for example in a separate method:

Class SurroundingClass
    Public Sub New()
        InitializeComponent()
        CalculateSum()
    End Sub

    Private Sub CalculateSum()
        For Each rowInfo In Me.radGridView1.Rows
            For Each cellInfo As GridViewCellInfo In rowInfo.Cells
                If cellInfo.ColumnInfo.Name = "Document" Then
                    If CDec(cellInfo.Value) >= 50 AndAlso CDec(cellInfo.Value) <= 100 Then
                        sum += CDec(cellInfo.Value)
                    End If
                End If
            Next
        Next
        Console.WriteLine(sum)
        Me.radLabel1.Text = sum.ToString()
    End Sub
End Class

I would like to note that RadGridView offers summary rows which may be suitable for your scenario. If you don't want to sum all the cell values, you can construct a custom summary item and override its Evaluate method where you can implement the desired logic for the calculation. Additional information is available in the following help article: https://docs.telerik.com/devtools/winforms/controls/gridview/rows/summary-rows

I hope this information helps. If you have further questions please let me know.

Regards,
Nadya
Progress Telerik

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answered on 29 Jun 2020, 11:25 AM

Hi Nadya,

have a problem with the RadTextBox4.Text and RadTextBox5.Text, these should only numbers and commas

as input allow, example: "23,40 " .

Therefore, include the following code:

Private Sub RadTextBox4_KeyPress(sender As Object, e As KeyPressEventArgs) Handles RadTextBox4.KeyPress

'* This function only allows numeric and comma inputs!!

Const Numbers" = "0123456789, "

If Asc(e.KeyChar) <> 8 Then

If InStr(Numbers, Chr(Asc(e.KeyChar))) = 0 Then

e.Handled = True

Exit Sub

End If

End Sub

Private Sub RadTextBox5_KeyPress(sender As Object, e As KeyPressEventArgs) Handles RadTextBox5.KeyPress

'* This function only allows numeric input!!

Const Numbers" = "0123456789, "

If Asc(e.KeyChar) <> 8 Then

If InStr(Numbers, Chr(Asc(e.KeyChar))) = 0 Then

e.Handled = True

Exit Sub

End If

End Sub

Also works well, only I noticed that if the user accidentally after the two

comma enters another comma as here "23,40", then the program crashes off with

the following error code:

-System.InvalidCastException: "Invalid conversion from the string 23.40, to type Double."-

on this line "*"

For Each rowInfo In Me.RadGridView1.Rows

For each cellInfo as GridViewCellInfo in rowInfo.cells

If cellInfo.ColumnInfo.Name = "Document" Then

** --> If CDec(cellInfo.Value) >= RadTextBox4.Text And CDec(cellInfo.Value)

sum += CDec(cellInfo.Value)

End If

Next

Question:

Can I somehow intercept this or prevent it with another KeyPress event?

answered on 02 Jul 2020, 09:40 AM

Hi, Andi,

Following the provided information it seems that you would like to enter only numeric values in the text box and later use them in the grid. If you do so, I can suggest to consider using RadMaskedEditBox. RadMaskedEditBox is a themeable text box that formats and constrains text to a predefined pattern or a pattern you define. The MaskType property defines what type of mask would be used in the masked box.

In your case when you want to display decimal values you can set the MaskType to Numeric. I hope you will find it more useful rather than restricting RadTextBox from undesired user input. Thus, the user will be able to type only numeric values without extra commas or other symbols. Please refer to the following articles:
https://docs.telerik.com/devtools/winforms/controls/editors/maskededitbox/maskededitbox
https://docs.telerik.com/devtools/winforms/controls/editors/maskededitbox/numeric-masks

Could you give RadMaskedEditBox a try and let me know if it is suitable for you.

I am looking forward to your reply.

Regards, Author nickname Progress Telerik

answered on 02 Jul 2020, 01:38 PM

Hi Nadya,

that with the RadMaskedEditBox was a good idea as it does not allow two commas,

Works super now.

At the beginning there was only a small error because the RadMaskedEditBox when starting the application

the field is empty and I got an error message :

- System.InvalidCastException: "Invalid conversion from string to type Double. -

First tried to enter this in the Form_Load erreigniss:

Me.RadMaskedEditBox1.MaskType = Telerik.WinControls.UI.MaskType.Numeric

Me.RadMaskedEditBox1.Mask = "C"

thought that when loading the shape the Me.RadMaskedEditBox.Mask = "C" = "0.00 € " would appear

had unfortunately also not worked,field also remained empty, same error message.

Then have tried it in the RadGridView1_CellFormatting with:

Me.RadMaskedEditBox1.MaskType = Telerik.WinControls.UI.MaskType.Numeric

Me.RadMaskedEditBox1.Mask = "C"

there it has then the Me.RadMaskedEditBox.Mask = "C" at the start of the application

in the "0.00 € " field,no more error message.

So the field must not be empty when starting the application otherwise there is this error.

Many people have a different idea of how to prevent this.

But thanks again for the hint with RadMaskedEditBox..