Flexgrid null problems

Flexgrid null problems

Posted by: p4spares on 25 November 2019, 4:13 am EST

• 

  p4spares

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  Posted 25 November 2019, 4:13 am EST

  hi,
  
  i’m converting my application from the old flexgrid 4.0.20162.188 to the latest 4.0.20193.393 and i’m facing a problem : the ToString() of my cell-object is automatically turned to null.
  
  i found some workarounds but i dont understand if it’s a bug or i’m missing something.
  
  here is my code, reduce to the minimum:

  c1FlexGrid1.EmptyAsNull = false;
  c1FlexGrid1.Cols[2].Caption = "Ula";
  c1FlexGrid1.Cols[2].DataType = typeof(WeightEditorValue); // see workaround #1
  c1FlexGrid1.Rows[1][2] = new WeightEditorValue();
  if (c1FlexGrid1.Rows[1][2] == null)
      MessageBox.Show("is null!");
  
  

  here is the data class:

  public class WeightEditorValue
      {
          public override string ToString()
          {
              return "";
              //return " "; see workaround #2..
          }
      }
  
  

  if i run this code, i get the message box.c1FlexGrid1.Rows[1][2] is null.
  
  if in the ToString() i return “”, it works as i expect.
  
  if i comment the line c1FlexGrid1.Cols[2].DataType = typeof(WeightEditorValue) it workes as expected.
  
  EmptyAsNull… seems have no effect, at least in this case.

  anybody can help me to understand what’s the best way to get the previous behaviour?
  
  thanks,
  
  David

• 

  prabhat.sharma

  

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  Posted 27 November 2019, 1:23 am EST

  Hello,

  We are discussing the case with the developers, will get back to you very soon.
  
  [Internal Tracking Id : 408439]

  Regards,
  
  Prabhat Sharma.

• 

  wknauf

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  Posted 27 November 2019, 5:30 am EST

  I had a similar discussion with support - apparently this was changed intentionally in version 4.0.20163.212 - more details in my support issue 220974.

  Best regards

  Wolfgang

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  prabhat.sharma

  

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  Posted 28 November 2019, 4:09 am EST

  Hello,

  @Wolfgang, thank you the help.

  @David, as said by the @Wolfgang this behavior was changed intentionally in version later to 4.0.20162.188 because there was a issue with deleting unbound cell content and the cause is entering empty.String value to non-nullable type and try to convert it which is later fixed as convert empty.String to null for all types.

  So it is a default behavior for current build and you can use your workaround by return the blank space as given below :

  public class WeightEditorValue
  {
     public override string ToString()
       {
              return " "
       }
  }
  

  I hope it clears.

  Regards,
  
  Prabhat Sharma.