Question

I’m having some problems with the following:

• I want to get the first visible AND frozen column of a column collection.

I think this will do it:

DataGridViewColumnCollection dgv = myDataGridView.Columns; dgv.GetFirstColumn(      DataGridViewElementStates.Visible | DataGridViewElementStates.Frozen); 

• Is it also possible to make a bitmask to get the first frozen OR visible column?

Answer 1

The implementation is, AFAIK, ‘all of these’ – it uses:

((this.State & elementState) == elementState); 

Which is ‘all of’. If you wanted to write an ‘any of’, perhaps add a helper method: (add the ‘this’ before DataGridViewColumnCollection to make it a C# 3.0 extension method in)

    public static DataGridViewColumn GetFirstColumnWithAny(         DataGridViewColumnCollection columns, // optional 'this'         DataGridViewElementStates states)     {         foreach (DataGridViewColumn column in columns)         {             if ((column.State & states) != 0) return column;         }         return null;     } 

Or with LINQ:

        return columns.Cast<DataGridViewColumn>()             .FirstOrDefault(col => (col.State & states) != 0);