Question

i want to merge two datagridview columns into one new column.

i first change Visible property of two col to false, then i try to add new col which that value must be formatted as this which col1Value and col2Value is value of above columns:

string.Format("{0} per {1}", col1Value, col2Value);

my code

reportResultForm.dgvResult.Columns["Height"].Visible = false;
reportResultForm.dgvResult.Columns["Width"].Visible = false;
DataGridViewColumn col = new DataGridViewColumn();
col.DefaultCellStyle.Format = "{0} per {1}";
col.CellTemplate = new DataGridViewTextBoxCell();
dgvResult.Columns.Add(col);

but i dont know how do this! please help me. my way is true?

Answer 1

You can made your own implementation of the DataGridViewTextBoxCell and override GetFormattedValue method for it. There you can return the formatted value for your column below is an example:

// use custom DataGridViewTextBoxCell as columns's template
col.CellTemplate = new MyDataGridViewTextBoxCell();

…

// custom DataGridViewTextBoxCell implementation 
public class MyDataGridViewTextBoxCell : DataGridViewTextBoxCell
{
    protected override Object GetFormattedValue(Object value,
        int rowIndex,
        ref DataGridViewCellStyle cellStyle,
        TypeConverter valueTypeConverter,
        TypeConverter formattedValueTypeConverter,
        DataGridViewDataErrorContexts context)
    {
        return String.Format("{0} per {1}",
            this.DataGridView.Rows[rowIndex].Cells[0].Value,
            this.DataGridView.Rows[rowIndex].Cells[1].Value);
    }
}

hope this helps, regards