当我向实体添加新记录时，它会给出 DbUpdateException

Question

//这里是读取上传文件的控制器。文件上传到App_Data时它工作成功，但是当上传到MS SQL Server时它给出错误“无效对象dbo.Prescription”

using SastiDawaai.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.IO;
using System.Data.Entity.Infrastructure;
using System.Data.Entity.Validation;

namespace SastiDawaai.Controllers
{
public class MedicineController : Controller
{

    // GET: Medicine
    public ActionResult Index()
    {
        MedicineContext medctx = null;
        using(medctx=new MedicineContext())
        {
        List<Medicine> medicinelist=medctx.Medicines.ToList();
        return View(medicinelist);
        }
    }

    [HttpPost]
    public ActionResult Index(HttpPostedFileBase file)
    {
        MedicineContext medctx = null;
        Prescription pres = null;
        if(file!=null && file.ContentLength>0)
        {
            ////upolading files to App_Server
            var filename = Path.GetFileName(file.FileName);
            var path = Path.Combine(Server.MapPath("~/App_Data"), filename);
            file.SaveAs(path);

            //uploading Files to database
            var file_content=new BinaryReader(file.InputStream);
            var content=file_content.ReadBytes(file.ContentLength);

                using (medctx = new MedicineContext())
                {
                    pres = new Prescription
                    {
                        Prescription_Receipt = content,
                        File_Name = filename,
                        Submitted_Date = DateTime.Now,


                    };


                    medctx.Prescriptions.Add(pres);
                    medctx.SaveChanges();

                }



        }
        return RedirectToAction("Index");
    }






}

}

//这是处方模型

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Web;

namespace SastiDawaai.Models
{

public class Prescription
{
    [Key]
    public int Prescription_Id { get; set; }
    public byte[] Prescription_Receipt { get; set; }
    public DateTime Submitted_Date { get; set; }
    public string File_Name { get; set; }
}
}

//这里是具有 2 个 DBSet “Medicine”和“Prescription”的 DBContext 类 //在 Medicine 实体中获取记录和插入记录没有问题，仅在将记录添加到添加到上下文中的任何其他 DBSet 时才会出现问题。

using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Web;

namespace SastiDawaai.Models
{
public class MedicineContext:DbContext
{

    public virtual DbSet<Medicine> Medicines { get; set; }
    public virtual DbSet<Prescription> Prescriptions { get; set; }
}
}

Answer 1

检查数据库中的表名

您的实体是 Prescription 并且您的表名应该是 PrescriptionS，并且还要检查您的表架构，在您的实体中它是 Dbo，所以您的数据库中的表应该是相同的架构。