C# 我正在尝试使用存储库模式和MVC获取数据库中提交的最后一条记录

我正在尝试使用存储库模式和MVC获取数据库中提交的最后一条记录。我附加了接口和类。还有控制器，你可以把代码放在那里。如果你需要更多的细节，请告诉我。谢谢

public interface IRequestRepository
{
    tblRequest GetCaseId(int caseId);     
}

public class RequestRepository: IRequestRepository
{
    helpdeskEntities context = null;
    public RequestRepository()
    {
        context = new helpdeskEntities();
    }
    public string GetCaseId(Ticket ticket)
    {
        string caseId = string.Empty;

        tblRequest tr = context.tblRequests.Where(u => u.CaseID == ticket.CaseID && u.UEmailAddress == ticket.UEmailAddress).SingleOrDefault();


        if (tr != null)
        {
            caseId = tr.CaseID;
        }

        return caseId;
    }

}

    public class Ticket
   {
    public int CaseID { get; set; }
    public string Title { get; set; }
    [Required]
    public string UFirstName { get; set; }
    [Required]
    public string ULastName { get; set; }
    //public string UDisplayName { get; set; }
    [Required]
    public string UDep_Location { get; set; }
    [Required]
    public string UEmailAddress { get; set; }
    //public string UComputerName { get; set; }
    //public string UIPAddress { get; set; }
    [Required]
    public string UPhoneNumber { get; set; }
    [Required]
    public string Priority { get; set; }
    [Required]
    public string ProbCat { get; set; }
    //public string IniDateTime { get; set; }
    //public string UpdateProbDetails { get; set; }
    //public string UpdatedBy { get; set; }
    public string InitiatedBy_tech { get; set; }
    public string AssignedBy { get; set; }
    public string TechAssigned { get; set; }
    [Required]
    [DataType(DataType.MultilineText)]
    public string ProbDetails { get; set; }


}



Controller
 public ActionResult CreateTicket(tblRequest td)
    {
    }

---

首先，您需要升级iRequestRespository并添加该方法： （我假设您正在为此使用EntityFramework）

接下来，您需要在

RequestRepository

中实现该方法：

   public class RequestRepository : IRequestRepository
   {
        /* other code here */

        public Request Latest(Ticket ticket)
        {
           // I'm also assuming you're using an auto incremented CaseId
           return this.context.tblRequests.OrderByDescending(p => p.CaseId).FirstOrDefault(p => p.UEmailAddress == ticket.UEmailAddress);
        }
    }

---

还有一件事：

您的IRequestRepository.GetCaseId实现返回一个字符串，而它应该返回一个

tblRequest

（您也可以期望它返回一个int-Id…）

---

不管怎样，我希望这有帮助

在RequestRepository类中实现IRequestRepository接口。在GetCaseId方法中使用Ticket作为参数不是接口声明的内容。

   public class RequestRepository : IRequestRepository
   {
        /* other code here */

        public Request Latest(Ticket ticket)
        {
           // I'm also assuming you're using an auto incremented CaseId
           return this.context.tblRequests.OrderByDescending(p => p.CaseId).FirstOrDefault(p => p.UEmailAddress == ticket.UEmailAddress);
        }
    }