Question

我正在尝试更新主/详细信息关系。目前，我的代码只更新了主表，但没有向详细信息页面添加任何内容。我可以很好地向两个表添加记录，但我希望能够更新主服务器并同时向细节添加新条目。屏幕截图显示了传递给我的Controller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，但只是主表格正在更新

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环境中，所以必须使用Attach函数，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;
 }

在您的代码中要小心宣布PPPEntities上下文，但不要使用它。您的代码正在调用未定义的db var。

Answer 2

使用Attach引发了错误，但更改为添加在我的情况下工作所以，谢谢你让我走上正轨

                AppDatabase.getInstance(getActivity()).mediaDao()
                    .getMediaByPathTest(getCurrentMedia().getPath())
                    .observeOn(Schedulers.io())
                    .subscribeOn(AndroidSchedulers.mainThread())
                    .subscribe(media -> {

                                if (media != null && media.isFavourite()) {
                                    Toast.makeText(SingleMediaActivity.this,
                                            "Bingo I m favorite", Toast.LENGTH_SHORT).show();
                                }


                            }, throwable -> {
                            }
                            , () -> {
                            });

更新MVC中的主/详细信息

2 个答案: