//添加新的进货信息
        private void AddNewPurchase(object sender, RoutedEventArgs e)
        {
            PurchaseGoodsAddAndUpdate pgau = new PurchaseGoodsAddAndUpdate();

            pgau.ShowDialog();
            LoadData();
        }
        //编辑选中的进货单
        private void EditPurchase_Click(object sender, RoutedEventArgs e)
        {
            object item = LV_PurchaseAndSupplier.SelectedItem;

            if (item == null)
            {
                MessageBox.Show("请选择进货批次", "错误", MessageBoxButton.OK,
                                MessageBoxImage.Error);
                return;
            }
            DataRowView oneRow             = item as DataRowView;
            PurchaseGoodsAddAndUpdate pgau =
                new PurchaseGoodsAddAndUpdate(false, new Purchase(oneRow["Pno"].ToString(),
                                                                  oneRow["Sno"].ToString(),
                                                                  Convert.ToDateTime(oneRow["Pdate"].ToString())));

            pgau.ShowDialog();
            LoadData();
        }