Problem to find column in C1Combo with IndexOf()

Problem to find column in C1Combo with IndexOf()

Posted by: thomas on 17 June 2020, 4:27 pm EST

• 

  thomas

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  Posted 17 June 2020, 4:27 pm EST

  Hi

  Can’t get this to work:
  
  Dim dc As New C1DataColumn
  
  dc.DataField = “Kflag”
  
  Dim iCol = C1Combo1.Columns.IndexOf(dc)

  iCol is -1

  This works:
  
  Dim iCol As Integer = -1
  
  For i = 0 To C1Combo1.Columns.Count - 1
  
  If C1Combo1.Columns(i).DataField = “Kflag” Then
  
  iCol = i
  
  Exit For
  
  End If
  
  Next

  iCol is correct column.

  (Datasource is datatable)

  Must say I’m not sure about the use of C1DataColumn. In other controls it’s possible to use string in IndexOf, but in C1Combo it need to be C1DataColumn.

  I’m using ComponentOne Studio for WinForms (.NET 4.0) 4.0.20183.343

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  prabhat.sharma

  

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  Posted 18 June 2020, 7:45 am EST

  Hi Thomas,

  The code snippet you used is creating a new instance of C1DataColumn which is not the part of C1Combo1. To get the correct column index use the code snippet given below:

  Dim iCol = C1Combo1.Columns.IndexOf(C1Combo1.Columns("Kflag"))
  
  

  Regards,
  
  Prabhat Sharma.

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  thomas

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  Posted 18 June 2020, 8:37 am EST

  Hi Prabhat!

  Great, thank you!

  Now I only need to check if the column exists. In other C1-components it world return -1, but not in this one. How can I check that?

  Regards
  
  Thomas Lindgren

• 

  prabhat.sharma

  

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  Posted 19 June 2020, 12:31 am EST

  Hi Thomas,

  You can use the code snippet given below to check. whether the specified column exists or not:

   Dim colExist As Boolean = False
          For i = 0 To C1Combo1.Columns.Count - 1
              If C1Combo1.Columns(i).DataField = "Field Name" Then
                  colExist = True
                  Exit For
              End If
          Next
          If colExist Then
              Console.WriteLine("Exists")
          Else
              Console.WriteLine("Does  not Exist")
          End If
  

  Regards,
  
  Prabhat Sharma.