在 MVC 中更新 Master / Details

Question

我正在尝试更新主/详细信息关系。目前我的代码只更新主 table 但不会向详细信息页面添加任何内容。我可以将记录添加到两个 tables 中，但我希望能够同时更新母版并向详细信息中添加新条目。屏幕截图显示了传递到我的控制器的数据。

    [HttpPost]
    public JsonResult saveEdit(OMR_OrderMaster order)
    {
        bool status = false;

        {
            using (PPPEntities dc = new PPPEntities())
            {
                {

                    db.Entry(order).State = EntityState.Modified;
                    db.SaveChanges();
                    status = true;
                }
            }
        }
        return new JsonResult { Data = new { status = status } };
    }

目前没有返回任何错误，但正在更新主表

namespace PPP2.Models
{
using System;
using System.Collections.Generic;

public partial class OMR_OrderMaster
{
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
    public OMR_OrderMaster()
    {
        this.OMR_OrderDetails = new HashSet<OMR_OrderDetails>();
    }

    public int OrderID { get; set; }
    public string OrderNo { get; set; }
    public System.DateTime OrderDate { get; set; }
    public string Description { get; set; }

    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
    public virtual ICollection<OMR_OrderDetails> OMR_OrderDetails { get; set; }
}

}

namespace PPP2.Models
{
using System;
using System.Collections.Generic;

public partial class OMR_OrderDetails
{
    public int OrderDetialsID { get; set; }
    public int OrderID { get; set; }
    public decimal Rate { get; set; }
    public int Quantity { get; set; }
    public int StockID { get; set; }

    public virtual OMR_OrderMaster OMR_OrderMaster { get; set; }
    }
}

Answer 1

因为您处于 EDMX 上下文中，所以您必须使用 Attach 函数，例如：

using (PPPEntities dc = new PPPEntities())
{
     foreach(var details in order.OMR_OrderDetails)
          dc.ORM_OrderDetails.Attach(details);
     dc.Entry(order).State = EntityState.Modified;
     dc.SaveChanges();
     status = true;
 }

Be careful in your code you are declaring a PPPEntities context but you don't use it. Your code is calling an undefined db var.

Answer 2

使用 Attach 抛出错误，但更改为 add 在我的情况下有效所以，谢谢你让我走上正轨

                foreach (var details in order.OMR_OrderDetails)
                dc.OMR_OrderDetails.Add(details);
                dc.Entry(order).State = EntityState.Modified;
                dc.SaveChanges();
                status = true;

在 MVC 中更新 Master / Details

Updating Master / Details in MVC

c#

sql

model-view-controller

edmx

visual-studio