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Karthik
335
override sort when click on column header
posted

Hi,

  I am using ultra grid . In that grid one of the column is drop down

vli = vl.ValueListItems.Add(dr["ColorName"].ToString(), "     ");

vli.Appearance.BackColor = myColor;

In the drop down column ,i want to display only color and no text.Thats why i changed the

display member as "   ".

Now I want to sort the column.If I set the display member as "   ".I cant sort the column when

click on header because sorting is done based on display member text

Now I want to know how to override sort(),so that sorting is based on value member

 ie here name of the colour

 Is that possible?

plz help

thanks in advance

 

  • 1590
    Suggested Answer
    posted

    You can use a SortComparer to determine your own sort logic.

    How to use:

    E.g. column "Value" has string type but it's sorted as numeric.

    1)

    private class CustomComparer : IComparer
            {
                int IComparer.Compare(object x, object y)
                {
                    UltraGridCell xCell = (UltraGridCell)x;
                    UltraGridCell yCell = (UltraGridCell)y;

                    double val1;
                    double val2;
                    double.TryParse(xCell.Value.ToString(), out val1);
                    double.TryParse(yCell.Value.ToString(), out val2);

                    return val1.CompareTo(val2);
                }

     2. Set it to column:

               UltraGridColumn valueCol = grid_.DisplayLayout.Bands[0].Columns["Value"];
                valueCol.SortComparer = new CustomComparer();

     

    Thanks,  Alex.