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Bug Report B204046
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Strange Behavior when setting VisibleIndex in BandedGridView after user customization

created 14 years ago

The attached sample contains a form with a grid control.
When running the sample and clicking on the button "Empty" or "Grouped" and then clicking on the button "Simple", all works fine.
If you now activate the "Simple" view and move the column colTypeText to the position before the colType and switch between the views you will get strange behaviors.
Case 1 - switching between "Simple" and "Empty":
- run the application
- click on "Empty" and back to "Simple" -> all fine
- move colTypeText to the position before colType
- click on "Empty" and back to "Simple" -> the colTypeText re-appears at the position where it has been moved to manually. The explicit setting of the VisibleIndex seems to be overridden somehow. If you debug the code which sets the VisibleIndex you will recognize that the VisibleIndex of colTypeText is reset to 1 when setting it to 2 and the VisibleIndex of colType is somehow changed to 2.
Case 2 - switching between "Simple" and "Grouped":
- run the application
- set a break point in ActivateView right after hiding all columns
- click on "Grouped" and back to "Simple" -> this.bandedGridView1.VisibleColumns.Count is 0 but the VisibleIndex of colType is 0. This is really strange because ClearGrouping() has been called and all VisibleColumns have explicitly been set to Visible = false
It looks to me like there is kind of a cache which stores the user customizations and this one is somehow overriding the executed code.
For me it looks like a bug.
Kind regards,
Alex

Comments (1)
DevExpress Support Team 14 years ago

    Hi Alex,
    This behavior is by design. As it is described in the BandedGridColumn.VisibleIndex article, assigning values greater than -1 has no effect. To change the column's position among visible columns in Banded Grid Views, use the GridBandColumnCollection.MoveTo method in the following manner:

    C#
    case "Simple":  
{  
  this.gridBand1.Visible = true;  
  //this.colID.VisibleIndex = 0;  
  //this.colType.VisibleIndex = 1;  
  //this.colTypeText.VisibleIndex = 2;  
  this.colID.Visible = true;  
  this.colType.Visible = true;  
  this.colTypeText.Visible = true;  
  gridBand1.Columns.MoveTo(0, colID);  
  gridBand1.Columns.MoveTo(1, colType);  
  gridBand1.Columns.MoveTo(2, colTypeText);  

  this.gridBand2.Visible = true;  
  //this.colNumber.VisibleIndex = 3;  
  //this.colText.VisibleIndex = 4;  
  this.colNumber.Visible = true;  
  this.colText.Visible = true;  
  gridBand1.Columns.MoveTo(3, colNumber);  
  gridBand1.Columns.MoveTo(4, colText);  
  break;  
}

    I hope this information will help you.
    Thanks,
    John.

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