将DataGridView转为DataTable

DataTable dt = new DataTable();
            for (int i = 0; i < this.dgv_制造指令.ColumnCount; i++)
            {
                dt.Columns.Add(this.dgv_制造指令.Columns[i].Name);
            }

            for (int j = 0; j < this.dgv_制造指令.RowCount; j++)
            {
                DataRow dr = dt.NewRow();

                for (int k = 0; k < this.dgv_制造指令.ColumnCount; k++)
                {
                    dr[this.dgv_制造指令.Columns[k].Name] = this.dgv_制造指令.Rows[j].Cells[k].Value.ToString();
                }

                dt.Rows.Add(dr);
            }