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0

I need help with a DataGridView please.

I have a Form with a DataGridView and I have a Class, that creates and fills a DataGridView. But the data isn't shown in the Form. The DataGridView gets filled with DataSource.

Code of the Form:

Public Class Form1
Public Sub New()
 InitializeComponent()

 Dim dgv As Class1 = New Class1

 DataGridView1 = dgv.Initialize()
End Sub
End Class

Code of the Class:

Public Class Class1
Private dgv As DataGridView

Public Sub New()
 dgv = New DataGridView
End Sub

Public Function Initialize() As DataGridView
 Dim ColumnName As String = "ABC"
 dgv.Columns.Add(ColumnName, "Text")
 dgv.Columns(ColumnName).DataPropertyName = ColumnName

 Dim sqlcmd As String = "select ABC from TABLE"
 'abstracted
 Dim TBL_Daten As DataTable = GetData(sqlcmd)

 dgv.DataSource = TBL_Daten

 Return dgv
End Function
End Class

In Debug I can see the DataGridView is filled.

vb.net datagridview

share|improve this question

asked Mar 8 at 8:19

JensJens

1

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Think about it. You have a DataGridView control that is displayed on the form because it has been added to the form's Controls collection. That same DataGridView is also assigned to the DataGridView1 field. You are then creating another DataGridView and assigning it to that variable. Whgy should that magically display the other DataGridView in the form's Controls collection too?
  
  – jmcilhinney
  Mar 8 at 8:44
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Basically, that class is dodgy. It shouldn't know anything about any grid. It should simply return the DataTable that it created and populated. The form can then assign that DataTable to the DataSource property of the existing DataGridView. Anything to do with the controls on a form are the responsibility of that form.
  
  – jmcilhinney
  Mar 8 at 8:45
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  "Whgy should that magically display the other DataGridView in the form's Controls collection too?" I thought, when I can work with the data with DataGridView1.DataSource, I could also work with the whole object. "It should simply return the DataTable." I would like to do the settings of the DataGridView in the class. If I later use the DataGridView in 10 Forms, I would have to do the settings in the 10 Forms. @jmcilhinney
  
  – Jens
  Mar 8 at 9:09
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Then you should be passing the DataGridView in from the form, not creating a new one.
  
  – jmcilhinney
  Mar 8 at 10:23
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I would prefer, if it would be a return value, but I changed it now to a Reference. I changed to dgv.Initialize(DataGridView1) and Public Sub Initialize(ByRef dgv As DataGridView). Thanks @jmcilhinney
  
  – Jens
  Mar 8 at 14:00
  

  
  
  
  

 | 
show 1 more comment

0

I need help with a DataGridView please.

I have a Form with a DataGridView and I have a Class, that creates and fills a DataGridView. But the data isn't shown in the Form. The DataGridView gets filled with DataSource.

Code of the Form:

Public Class Form1
Public Sub New()
 InitializeComponent()

 Dim dgv As Class1 = New Class1

 DataGridView1 = dgv.Initialize()
End Sub
End Class

Code of the Class:

Public Class Class1
Private dgv As DataGridView

Public Sub New()
 dgv = New DataGridView
End Sub

Public Function Initialize() As DataGridView
 Dim ColumnName As String = "ABC"
 dgv.Columns.Add(ColumnName, "Text")
 dgv.Columns(ColumnName).DataPropertyName = ColumnName

 Dim sqlcmd As String = "select ABC from TABLE"
 'abstracted
 Dim TBL_Daten As DataTable = GetData(sqlcmd)

 dgv.DataSource = TBL_Daten

 Return dgv
End Function
End Class

In Debug I can see the DataGridView is filled.

vb.net datagridview

share|improve this question

asked Mar 8 at 8:19

JensJens

1

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Think about it. You have a DataGridView control that is displayed on the form because it has been added to the form's Controls collection. That same DataGridView is also assigned to the DataGridView1 field. You are then creating another DataGridView and assigning it to that variable. Whgy should that magically display the other DataGridView in the form's Controls collection too?
  
  – jmcilhinney
  Mar 8 at 8:44
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Basically, that class is dodgy. It shouldn't know anything about any grid. It should simply return the DataTable that it created and populated. The form can then assign that DataTable to the DataSource property of the existing DataGridView. Anything to do with the controls on a form are the responsibility of that form.
  
  – jmcilhinney
  Mar 8 at 8:45
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  "Whgy should that magically display the other DataGridView in the form's Controls collection too?" I thought, when I can work with the data with DataGridView1.DataSource, I could also work with the whole object. "It should simply return the DataTable." I would like to do the settings of the DataGridView in the class. If I later use the DataGridView in 10 Forms, I would have to do the settings in the 10 Forms. @jmcilhinney
  
  – Jens
  Mar 8 at 9:09
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Then you should be passing the DataGridView in from the form, not creating a new one.
  
  – jmcilhinney
  Mar 8 at 10:23
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I would prefer, if it would be a return value, but I changed it now to a Reference. I changed to dgv.Initialize(DataGridView1) and Public Sub Initialize(ByRef dgv As DataGridView). Thanks @jmcilhinney
  
  – Jens
  Mar 8 at 14:00
  

  
  
  
  

 | 
show 1 more comment

I need help with a DataGridView please.

I have a Form with a DataGridView and I have a Class, that creates and fills a DataGridView. But the data isn't shown in the Form. The DataGridView gets filled with DataSource.

Code of the Form:

Public Class Form1
Public Sub New()
 InitializeComponent()

 Dim dgv As Class1 = New Class1

 DataGridView1 = dgv.Initialize()
End Sub
End Class

Code of the Class:

Public Class Class1
Private dgv As DataGridView

Public Sub New()
 dgv = New DataGridView
End Sub

Public Function Initialize() As DataGridView
 Dim ColumnName As String = "ABC"
 dgv.Columns.Add(ColumnName, "Text")
 dgv.Columns(ColumnName).DataPropertyName = ColumnName

 Dim sqlcmd As String = "select ABC from TABLE"
 'abstracted
 Dim TBL_Daten As DataTable = GetData(sqlcmd)

 dgv.DataSource = TBL_Daten

 Return dgv
End Function
End Class

In Debug I can see the DataGridView is filled.

vb.net datagridview

share|improve this question

asked Mar 8 at 8:19

JensJens

1

Public Class Form1
Public Sub New()
 InitializeComponent()

 Dim dgv As Class1 = New Class1

 DataGridView1 = dgv.Initialize()
End Sub
End Class

Public Class Class1
Private dgv As DataGridView

Public Sub New()
 dgv = New DataGridView
End Sub

Public Function Initialize() As DataGridView
 Dim ColumnName As String = "ABC"
 dgv.Columns.Add(ColumnName, "Text")
 dgv.Columns(ColumnName).DataPropertyName = ColumnName

 Dim sqlcmd As String = "select ABC from TABLE"
 'abstracted
 Dim TBL_Daten As DataTable = GetData(sqlcmd)

 dgv.DataSource = TBL_Daten

 Return dgv
End Function
End Class

share|improve this question

asked Mar 8 at 8:19

JensJens

1

share|improve this question

asked Mar 8 at 8:19

JensJens

1

asked Mar 8 at 8:19

JensJens

1

asked Mar 8 at 8:19

JensJens

1