c# - SaveChanges() 的验证错误

Question

我的 Asp.net mvc web 应用程序中有以下 Action 方法:-

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create(SDJoin sdj, FormCollection formValues)
{
    Try
    {
        //code goes here
        repository.InsertOrUpdateSD(sdj.StorageDevice, User.Identity.Name, assetid);
        repository.Save();
    }
    catch (Exception ex)
    {
        //code goes here
    }
    PopulateViewBagData();
    return View(sdj);
}

调用以下方法:-

public void InsertOrUpdateSD(TMSStorageDevice sd, string username, long assetid)
{
    var resource = entities.Resources.AsNoTracking().SingleOrDefault(a => a.RESOURCEID == assetid);
    if (sd.TMSStorageDeviceID == default(int))
    {
        // New entity
        int technologyypeID = GetTechnologyTypeID("Storage Device");
        Technology technology = new Technology
        {
            IsDeleted = true,
            IsCompleted = false,
            TypeID = technologyypeID,
            Tag = "SD" + GetTagMaximumeNumber2(technologyypeID).ToString(),
            StartDate = DateTime.Now,
            IT360ID = assetid
        };

        InsertOrUpdateTechnology(technology);
        Save();

        sd.TMSStorageDeviceID = technology.TechnologyID;
        tms.TMSStorageDevices.Add(sd);
    }
}

我的模型类如下:-

public partial class TMSStorageDevice
{
    public int TMSStorageDeviceID { get; set; }
    public string Name { get; set; }
    public Nullable<decimal> size { get; set; }
    public int RackID { get; set; }
    public string CustomerName { get; set; }
    public string Comment { get; set; }
    public byte[] timestamp { get; set; }

    public virtual Technology Technology { get; set; }
    public virtual TMSRack TMSRack { get; set; }
}

但如果我调用 Create 操作方法，我将得到以下异常:-

System.Data.Entity.Validation.DbEntityValidationException was caught
  HResult=-2146232032
  Message=Validation failed for one or more entities. See 'EntityValidationErrors' property for more details.
  Source=EntityFramework
  StackTrace:
       at System.Data.Entity.Internal.InternalContext.SaveChanges()
       at System.Data.Entity.Internal.LazyInternalContext.SaveChanges()
       at System.Data.Entity.DbContext.SaveChanges()
       at TMS.Models.Repository.Save() in c:\Users\Administrator\Documents\Visual Studio 2012\Projects\TMS\TMS\Models\Repository.cs:line 1926
       at TMS.Controllers.StorageDeviceController.Create(SDJoin sdj, FormCollection formValues) in c:\Users\Administrator\Documents\Visual Studio 2012\Projects\TMS\TMS\Controllers\StorageDeviceController.cs:line 160
  InnerException:

谁能告诉我出了什么问题，因为我仔细检查了我的代码，一切都应该正常工作？谢谢

Answer 1

您还没有显示 Save() 方法，但是如果您可以向其中添加这样的代码，您将得到一个异常，其中包含您要查找的所有详细信息

try
{
    _context.SaveChanges();
}
catch (System.Data.Entity.Validation.DbEntityValidationException dbEx)
{
    Exception raise = dbEx;
    foreach (var validationErrors in dbEx.EntityValidationErrors)
    {
        foreach (var validationError in validationErrors.ValidationErrors)
        {
            string message = string.Format("{0}:{1}", 
                validationErrors.Entry.Entity.ToString(),
                validationError.ErrorMessage);
            // raise a new exception nesting
            // the current instance as InnerException
            raise = new InvalidOperationException(message, raise);
        }
    }
    throw raise;
}