try ...{ object[] m_arr; this.Cursor = Cursors.WaitCursor; int iRow = ((CustomDataGridView)sender).CurrentCell.RowIndex; if (((CustomDataGridView)sender).CurrentRow.Cells[e.ColumnIndex].OwningColumn.Name == "Part_NO") ...{ DataSet ds; ServicePO.PO poBLL = new ServicePO.PO(); if (poBLL.SelectUnit(dataGridView1.Rows[iRow].Cells["Part_NO"].Value.ToString(), out m_arr, out ds)) ...{ dataGridView1.Rows[iRow].Cells["Unit_Code"].Value = m_arr[0].ToString(); dataGridView1.Rows[iRow].Cells["Unit_Name"].Value = m_arr[1].ToString(); ((DataGridViewComboBoxCell)dataGridView1.Rows[iRow].Cells["FZ_Unit_Name"]).DataSource = ds.Tables[0]; //设置主键 ds.Tables[0].PrimaryKey = new DataColumn[]...{ds.Tables[0].Columns["Unit_Code"]}; ((DataGridViewComboBoxCell)dataGridView1.Rows[iRow].Cells["FZ_Unit_Name"]).DisplayMember = "Unit_Name"; ((DataGridViewComboBoxCell)dataGridView1.Rows[iRow].Cells["FZ_Unit_Name"]).ValueMember = "Unit_Code"; } } if (((CustomDataGridView)sender).CurrentRow.Cells[e.ColumnIndex].OwningColumn.Name == "FZ_Unit_Qty" || ((CustomDataGridView)sender).CurrentRow.Cells[e.ColumnIndex].OwningColumn.Name == "FZ_Unit_Name") ...{ if (dataGridView1.Rows[iRow].Cells["FZ_Unit_Qty"].Value != System.DBNull.Value)//原料 ...{ double dUnitRate, dFZ_Unit_Qty; string sUnit_Code = dataGridView1.Rows[iRow].Cells["FZ_Unit_Name"].Value.ToString(); //根据主键获取 Unit_Rate p.unit_code,u.unit_name,p.unit_rate DataRow foundRow=((DataTable)(((DataGridViewComboBoxCell)dataGridView1.Rows[iRow].Cells["FZ_Unit_Name"])).DataSource).Rows.Find (new object[]...{sUnit_Code}); double.TryParse(foundRow["unit_rate"].ToString(), out dUnitRate); double.TryParse(dataGridView1.Rows[iRow].Cells["FZ_Unit_Qty"].Value.ToString(), out dFZ_Unit_Qty); dataGridView1["Qty", iRow].Value = dUnitRate * dFZ_Unit_Qty; } }