RadGridView loses format when it is updated.

[LLC]

Hi, in my program I have a RadGridView. Some of the cells are formatted with different backgroundcolor or they are disabled. The first time I bind the grid with data read from a table of a database it shows correct but If I update the grid it loses the format (All the cells are white and enabled) . 

The cells are formatted according to this approach  http://www.telerik.com/community/forums/winforms/gridview/createcell-event-cellelement-is-always-null.aspx (First it sets a tag for each cell in DataBindingComplete and subsequently depending on this value it sets backcolor and enabled properties for the cell.)

Here is the code (Cheers to Emanuel Varga for it):

void radGridView1_CellFormatting(object sender, CellFormattingEventArgs e)
{
    if (e.CellElement.RowInfo.Cells[0].Tag != null && e.CellElement.RowInfo.Cells[0].Tag.Equals(true))
    {
        e.CellElement.BackColor = Color.Red;
        e.CellElement.DrawFill = true;
    }
    else
    {
        e.CellElement.ResetValue(LightVisualElement.BackColorProperty, ValueResetFlags.Local);
        e.CellElement.ResetValue(LightVisualElement.DrawFillProperty, ValueResetFlags.Local);
    }
}

void radGridView1_DataBindingComplete(object sender, GridViewBindingCompleteEventArgs e)
{
    foreach (var row in radGridView1.Rows)
    {
        if (row.Index % 2 == 0)
        {
            row.Cells[0].Tag = true;
        }
    }
}

Thanks for the answers.

[Richard Slade]

Hello LLC,

i think this may be the same as a bug I have just reported.

Can you just try calling

e.CellElement.ResetValue(LightVisualElement.BackColorProperty, ValueResetFlags.Local);
        e.CellElement.ResetValue(LightVisualElement.DrawFillProperty, ValueResetFlags.Local);

as the first thing you do in your CellFormatting event please, and then perform the rest as you are doing there and let me know the result.

Thanks
Richard

[LLC]

Hi, Richard. Unluckily it doesn't work :(

 

 

[Richard Slade]

Sorry to hear that. If you breakpoint one.CellElement.BackColor is it ever reaching that code?
Richard

[Richard Slade]

Hello LLC,

Apologies this is in VB for now, but I've tried binding to a simple datasource, with a button on the form that re-binds to a new datasource, using your CellFormatting code and your DataBindingComplete method and I couldn't replicate your issue.

Please can you try it also and let me know if it runs ok on yours?

Imports Telerik.WinControls
Imports Telerik.WinControls.UI
Imports System.Globalization

Public Class Form1

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        Dim list As New List(Of person)
        list.Add(New person("Richard", 1))
        list.Add(New person("Bob", 2))
        list.Add(New person("Stewart", 3))
        list.Add(New person("Chris", 4))
        list.Add(New person("Leisl", 1))
        list.Add(New person("Tom", 5))
        list.Add(New person("Oly", 6))

        Me.RadGridView1.DataSource = list


    End Sub

    Private Sub RadButton1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadButton1.Click
        Dim list As New List(Of person)
        list.Add(New person("Ian", 1))
        list.Add(New person("Bert", 2))
        list.Add(New person("Brian", 3))
        list.Add(New person("Ethel", 4))
        list.Add(New person("Mabel", 1))
        list.Add(New person("Gertrude", 5))
        list.Add(New person("Molly", 6))

        Me.RadGridView1.DataSource = list
    End Sub

    Private Sub RadGridView1_CellFormatting(ByVal sender As System.Object, _
        ByVal e As Telerik.WinControls.UI.CellFormattingEventArgs) Handles RadGridView1.CellFormatting

        If e.CellElement.RowInfo.Cells(0).Tag IsNot Nothing AndAlso e.CellElement.RowInfo.Cells(0).Tag.Equals(True) Then
            e.CellElement.BackColor = Color.Red
            e.CellElement.DrawFill = True
        Else
            e.CellElement.ResetValue(LightVisualElement.BackColorProperty, ValueResetFlags.Local)
            e.CellElement.ResetValue(LightVisualElement.DrawFillProperty, ValueResetFlags.Local)
        End If

    End Sub

    Private Sub RadGridView1_DataBindingComplete(ByVal sender As System.Object, ByVal e As Telerik.WinControls.UI.GridViewBindingCompleteEventArgs) Handles RadGridView1.DataBindingComplete
        For Each row As GridViewRowInfo In RadGridView1.Rows
            If row.Index Mod 2 = 0 Then
                row.Cells(0).Tag = True
            End If
        Next
    End Sub


End Class

Public Class person
    Private m_Id As Integer
    Private m_Name As String

    Public Sub New()
    End Sub

    Public Sub New(ByVal name As String, ByVal id As Integer)
        m_Name = name
        m_Id = id
    End Sub

    Public Property Name() As String
        Get
            Return m_Name
        End Get
        Set(ByVal value As String)
            m_Name = value
        End Set
    End Property

    Public Property Id() As Integer
        Get
            Return m_Id
        End Get
        Set(ByVal value As Integer)
            m_Id = value
        End Set
    End Property
End Class

Let me know if I can help further
Richard

[LLC]

Hi, Richard. Don't worry about if the code is VB or C#. I've tested your sample code and it works (maybe due to the data are in a list?) but in my case it keeps failing (My data come from a datatable , the database is SQL SERVER 2005). The difference between your code and mine one is that after updating the table I wasn't setting datasource property of the grid to the table; I've set it  but it fails too). For the moment to sort it out I set datasource property of RadGridView to nothing and then I set it to the table which contains the data again. This way the cells are well formatted.

Thanks for your effort and assistance.

[Richard Slade]

Hi LLC,

I'm glad you solved your issue. If you feel any of the suggestions helped, please mark as answer. And if there's anything else you need just let me know.

Richard