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Arjen
560
Grouping and expand all rows
posted

Hi!

We have a xamWebGrid in our application with grouping enabled. For this grid we have a button for expanding all rows. I copied the code for expanding all rows from the samples browser: 

    public void ExpandRows(RowCollection rows)
    {
      foreach (Row row in rows)
      {
        row.IsExpanded = true;

        if (row.HasChildren)
        {
          ExpandRows(row.ChildBands[0].Rows);
        }
      }
    }

When I click Expand I get an exception in the ExpandRows method on this line: ExpandRows(row.ChildBands[0].Rows);

The exception:

-           row.ChildBands    'row.ChildBands' threw an exception of type 'System.InvalidCastException'      Infragistics.Silverlight.Controls.Primitives.ChildBandCollection {System.InvalidCastException} 

-           base  {System.InvalidCastException: Unable to cast object of type 'Infragistics.Silverlight.Controls.RowCollection' to type 'Infragistics.Silverlight.Controls.Primitives.ChildBandCollection'.

   at Infragistics.Silverlight.Controls.Row.get_ChildBands()

   at Infragistics.Silverlight.Controls.Primitives.GroupByRow.get_ChildBands()}      System.SystemException {System.InvalidCastException}

Do you have any idea how this can be solved?

Thanks,

Arjen

 

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  • 40030
    Verified Answer
    Offline posted

    Hi Arjen, 

    The exeption you're getting, is b/c GroupByRows have a Rows, and wouldn't have ChildBands.  Here is a modified version of that function:

               private void ExpandRows(RowCollection rows)

                {

                      if (rows.Count > 0)

                      {

                            if (rows[0].RowType == RowType.GroupByRow)

                            {

                                  // Expand GroupByRows

                                  foreach (GroupByRow row in rows)

                                  {

                                        row.IsExpanded = true;

                                        if (row.HasChildren)

                                              this.ExpandRows(row.Rows);

                                  }

                            }

                            else

                            {

                                  // Expand DataRows

                                  foreach (Row row in rows)

                                  {

                                        row.IsExpanded = true;

                                        if (row.HasChildren)

                                              this.ExpandRows(row.ChildBands[0].Rows);

                                  }

                            }

                      }

                }

     

    Hope this helps, 

    -SteveZ

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