AdventureWorks 数据绑定示例添加 SalesOrderDetail 窗体（EDM 示例应用程序）

AdventureWorks 数据绑定应用程序使用单独的 Windows 窗体添加一个新的 SalesOrderDetail 实体。

应用程序代码

用户单击**“Accept Order”（接受订单）**按钮时，即创建一个新的 SalesOrderDetail 并添加到存储中。然后处理将返回到主窗体和 buttonAddSalesOrder_Click 处理程序，在其中对数据网格进行更新。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using AdventureWorksModel;
using System.Data.Objects;

namespace AdWksSalesWinDataBind
{
    public partial class FormAddSalesOrderDetail : Form
    {
        ObjectContext parentObjCtx = null;
                
        public FormAddSalesOrderDetail()
        {
            InitializeComponent();
        }

        public FormAddSalesOrderDetail(ObjectContext ctx)
        {
            InitializeComponent();
            parentObjCtx = ctx;
        }

        private void buttonCancelOrder_Click(object sender, EventArgs e)
        {
            this.Dispose();
        }

        private void formAddSalesOrderDetail_Load(object sender, EventArgs e)
        {
            if (this.Owner.Controls["textBoxOrderId"].Text.Equals(""))
            {
                MessageBox.Show("Add Sales Order Header Number",
                    "No Header Number");
                this.Dispose() ;
                return;
            }

            bindingSource1.DataSource = 
                ((AdventureWorksEntities)parentObjCtx).
                           Product.Execute(MergeOption.AppendOnly);
            dataGridViewProducts.DataSource = bindingSource1;

        }

        private void buttonAcceptNewOrder_Click(object sender, EventArgs e)
        {
            using (AdventureWorksEntities objCtx = new AdventureWorksEntities())
            {
                SalesOrderDetail newSODetail = new SalesOrderDetail();
                newSODetail.ProductID =
                    Int32.Parse(dataGridViewProducts.SelectedRows[0].Cells[0].Value.ToString());

                if (textBoxQuantity.Text.Equals(""))
                {
                    MessageBox.Show("Enter quantity");
                    return;
                }
                newSODetail.OrderQty = Int16.Parse(textBoxQuantity.Text);

                try
                {
                    newSODetail.CarrierTrackingNumber = "4E0A-4F89-AE";
                    newSODetail.ModifiedDate = DateTime.Now;
                    newSODetail.SpecialOfferID = 1;
                    newSODetail.rowguid = Guid.NewGuid(); // create new guid.
                    newSODetail.UnitPrice =
                        Decimal.Parse(dataGridViewProducts.SelectedRows[0].Cells[9].Value.ToString());
                    if (!textBoxDiscount.Text.Equals(""))
                    {
                        newSODetail.UnitPriceDiscount =
                        Decimal.Parse(textBoxDiscount.Text) * (Decimal).01;
                    }
                    else
                    {
                        newSODetail.UnitPriceDiscount = 0;
                    }

                    Int32 textboxHeaderNumber = Int32.Parse(this.Owner.Controls["textBoxOrderId"].Text);

                    ObjectParameter parameter =
                    new ObjectParameter("p", textboxHeaderNumber);

                    SalesOrderHeader header =
                        objCtx.SalesOrderHeader.Where(
                        "it.SalesOrderID = @p", parameter).
                        FirstOrDefault<SalesOrderHeader>();

                    objCtx.AddToSalesOrderDetail(newSODetail);

                    header.SalesOrderDetail.Add(newSODetail);
                    objCtx.SaveChanges();
                    
                }
                catch (Exception exception)
                {
                    MessageBox.Show("Msg: " + exception.Message + "\r\nInner Exception: " +
                        exception.InnerException);
                }
            }

            
            
        }

        private void textBoxDiscount_Validating(object sender, CancelEventArgs e)
        {
            if(textBoxDiscount.Text.Equals(""))
                return;
            if (Int32.Parse(textBoxDiscount.Text) < 0 || 
                Int32.Parse(textBoxDiscount.Text) > 25 )
            {
                MessageBox.Show("Enter discount between 0 and 25");
            }
            
        }

    }
}

另请参见

概念

Adventure Works 数据绑定（EDM 示例应用程序）
AdventureWorks 数据绑定示例应用程序代码（EDM 示例应用程序）