Column header color

Hi Claudio,

Please try the following code snippet I tried to change the fore color and background color of a column header.

C#:

Thanks,
Princy.

Hello Claudio,

Thank you for contacting Telerik Support.

Princy's answer is in the right direction. The appropriate way to achieve your goal is to use the ViewCellFormatting event which is fired not only for data cells, but for all RadGridView cells. 
Due to the UI virtualization in RadGridView, cell elements are created only for currently visible cells and are being reused during operations like scrolling, filtering, grouping and so on.

In order to prevent applying the formatting to other columns' cell elements (because of the cell reuse) all customization should be reset for the rest of the cell elements (please see the attached picture demonstrating wrong formatting without resetting):

More information about cell formatting is available here: http://www.telerik.com/help/winforms/gridview-cells-formatting-cells.html.

I hope this information helps. Should you have further questions, I would be glad to help.

Regards, Desislava
Telerik

Thanks, this helped.

Once the color is applied, how do we get the color of the cell from the cell's rowindex and columnindex?
I have a CellDoubleClickevent set up on the grid which gives me an instance of CellFormattingEventArgs and I need to get to the cell's backcolor. I use the following code, but it doesn't give me the right color.

void CellDoubleClick(object sender, CellFormattingEventArgs e)
{
     myOpenGrid.Rows[e.RowIndex].Cells[e.ColumnIndex].Style.BackColor
}

Note: myOpenGrid is of type RadGridView. BackColor2, BackColor3, BackColor4 doesn't work either.


Here's my code to set the backcolor in myOpenGrid_ViewCellFormatting event
    e.CellElement.DrawFill = true;
    e.CellElement.ForeColor = Color.Black;
    e.CellElement.NumberOfColors = 1;
    e.CellElement.BackColor = Color.LightBlue;

Is there no way to get the current color of the cell?

Hello Claudio,

Thank you for writing back.

In order to get the cell BackColor in the CellDoubleClick event, it is appropriate to use the following code:

Note that   may throw an exception (ThrowArgumentOutOfRangeException) if you click on the header cell as its RowIndex=-1. In general you should use avoid using indexes in order to lower the chances of such errors.

I hope this information helps. Should you have further questions, I would be glad to help.

Regards, Desislava
Telerik

Hello Princy,

I have a problem with that code. If I have a horizontal scroll in the grid, to commute with him the background colors of the headers are changed uncontrollably.

any ideas?

Thanks

Sorry, did not read every post. I've already solved. thanks

how to change all raddatagrid column header color by using for loop ?

i use this code without loop just assigned what the object is :

        If (e.CellElement.ViewTemplate Is template) And (TypeOf e.CellElement Is GridHeaderCellElement) Then
            e.CellElement.BackColor = Color.PowderBlue
            e.CellElement.NumberOfColors = 1
            e.CellElement.DrawFill = True
            'e.CellElement.TableElement.TableHeaderHeight = 100
        ElseIf (e.CellElement.ViewTemplate Is template) And (TypeOf e.CellElement Is GridCellElement) Then
            e.CellElement.BackColor = Color.Honeydew
            e.CellElement.NumberOfColors = 1
            e.CellElement.DrawFill = True
        End If

        If (e.CellElement.ViewTemplate Is template1) And (TypeOf e.CellElement Is GridHeaderCellElement) Then
            e.CellElement.BackColor = Color.DarkKhaki
            e.CellElement.NumberOfColors = 1
            e.CellElement.DrawFill = True
            'e.CellElement.TableElement.TableHeaderHeight = 100
        ElseIf (e.CellElement.ViewTemplate Is template1) And (TypeOf e.CellElement Is GridCellElement) Then
            e.CellElement.BackColor = Color.LightGoldenrodYellow
            e.CellElement.NumberOfColors = 1
            e.CellElement.DrawFill = True
        End If

 

is it vb Code  Andi ?

yes it is. use ViewCellFormatting event

    Private Sub RadGridView1_ViewCellFormatting(ByVal sender As Object, ByVal e As Telerik.WinControls.UI.CellFormattingEventArgs) Handles RadGridView1.ViewCellFormatting

    End Sub

i need c# code

http://converter.telerik.com/

you can convert VB.net code to C# with this.

Hello,  

In order to customize the grid cells, it is suitable to use the ViewCellFormatting event considering the type of the CellElement that you want to customize. Due to the UI virtualization in RadGridView, cell elements are created only for currently visible cells and are being reused during operations like scrolling, filtering, grouping and so on. In order to prevent applying the formatting to other columns' cell elements (because of the cell reuse), all customization should be reset for the rest of the cell elements. Additional information is available in the following help article: https://docs.telerik.com/devtools/winforms/gridview/cells/formatting-cells

You can use the spy tool in order to inspect the cell type that you want customize: https://docs.telerik.com/devtools/winforms/tools/controlspy/controlspy

I hope this information helps. 

Regards,
Dess | Tech Support Engineer, Sr.
Progress Telerik

Hi, I tried to use the same code for cell formatting but it says could not find Telerik.WinControls.UI.. may I know which nuget package I have to install for this?

Hello, Praveena,  

In order to use RadGridView in your project and handle the CellFormatting event you need to ensure that the following references are added to your project:
-Telerik.WinControls
-Telerik.WinControls.GridView
-Telerik.WinControls.UI
-TelerikCommon
 
I hope this information helps.

Regards,
Dess | Tech Support Engineer, Sr.
Progress Telerik

If I search for Telerik.WinControls in Telerik nuget packages list, I am not getting any result. could you please tell me the exact nuget package name? I already have installed 4 nuget packages as in the attached screenshot.

 

Hello Praveena,

Based on your screenshot it seems that you have installed WPF NuGet packages in your project. 
Please note that Desislava's message is valid for UI for WinForms not WPF since this forum is related to the Telerik UI for WinForms suite.

Can you please confirm whether you are using WPF or WinForms technology so we can assist you further?

Regards,
Dimitar
Progress Telerik