救命啊！Ｃ＃DataGridView问题！！

Question

dataGridView1.Rows[counter].Cells[19].Value = (balance + deposit - withdrawal).ToString();
又触发dataGridView1_CellValueChanged加个全局变量判断
  
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Answer 1

dataGridView有个虚拟模式（VirtualMode=true）。用这个做计算是最好的。去查一下VirtualMode的资料

Answer 2

dataGridView.VirtualMode=true
private void dataGridView_CellValueNeeded(object sender, DataGridViewCellValueEventArgs e)
        {
            switch (dataGridView.Columns[e.ColumnIndex].Name)
            {
                case "":
                    e.Value = (decimal)dataGridView.Rows[e.RowIndex].Cells[""].Value +
                        (decimal)dataGridView.Rows[e.RowIndex].Cells[""].Value;
                    break;
                case "":
                    e.Value = (decimal)dataGridView.Rows[e.RowIndex].Cells[""].Value *
                    (decimal)dataGridView.Rows[e.RowIndex].Cells[""].Value;
                    break;
            }
        }        private void dataGridView_CellValidated(object sender, DataGridViewCellEventArgs e)
        {
            switch (dataGridView.Columns[e.ColumnIndex].Name)
            {
                case "":
                    dataGridView.UpdateCellValue(dataGridView.Columns[""].Index, e.RowIndex);
                    dataGridView.UpdateCellValue(dataGridView.Columns[""].Index, e.RowIndex);
                    break;
                case "":
                    dataGridView.UpdateCellValue(dataGridView.Columns[""].Index, e.RowIndex);
                    break;
          }
        }