Question

    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult Create([Bind(Include = "StaffID,StartDate,EndDate,LeaveType,NoOfDays,AppStatus,HiddenID,LeaveReason,UpdateDate,UpdatedBy")] CurrentApplication currentApplication, Staff staff)
    {
        if (ModelState.IsValid)
        {
            db.CurrentApplications.Add(currentApplication);
            currentApplication.UpdateDate = System.DateTime.Now;
            currentApplication.AppStatus = "PENDING";
            currentApplication.UpdatedBy = User.Identity.Name;

            var model = new LeaveIndexData();
            var userEmail = User.Identity.Name;
            model.Staffs = db.Staffs.Single(i => i.Email == userEmail);
            var userID = model.Staffs.StaffID;
            currentApplication.StaffID = userID;

            //decimal period = (currentApplication.StartDate.Date - currentApplication.EndDate.Date).TotalDays;
            //currentApplication.NoOfDays = period;

            TimeSpan tSpan = (currentApplication.EndDate.Value).Subtract(currentApplication.StartDate.Value);
            currentApplication.NoOfDays = tSpan.Days + 1;

            db.Staffs.Add(staff);
            staff.BalanceLeave = staff.BalanceLeave - currentApplication.NoOfDays; 

            db.SaveChanges();
            return RedirectToAction("Index");
        }

        return View(currentApplication);
    }

我的上面的创建给了我错误Validation failed for one or more entities. See 'EntityValidationErrors' property for more details.它很好并且完美地工作直到我添加这两行：

db.Staffs.Add（人员）;

staff.BalanceLeave = staff.BalanceLeave - currentApplication.NoOfDays;

我认为这样做会很好，因为我在db.Staffs中添加的方式与CurrentApplications相同，但它意外地给了我错误。我也不确定如何解决它。

我的员工模型如下所示：

public partial class Staff
{
    public int StaffID { get; set; }
    public string Name { get; set; }
    public string Email { get; set; }
    public Nullable<decimal> AllocatedLeave { get; set; }
    public Nullable<decimal> BalanceLeave { get; set; }
}

我知道有类似的问题，但那些是关于如何找到错误。我知道现在的错误是什么，但是我无法弄清楚为什么我会这样做，因为它对我来说似乎是正确的。请帮忙！谢谢:)）

Answer 1

我认为这可以帮助您验证确切的错误，并且您还可以向用户输出一些人类可读的消息。

 try
    {
      Db.SaveChanges();
    }
    catch(DbEntityValidationException ex){
      foreach(var property in ex.EntityValidationErrors)
      {

        string entityName=eve.Entry.Entity.GetType().Name;

        foreach(var error in property.ValidationErrors)
        {
          Debug.WriteLine("Table name: "+entityName+"  "+ error.PropertyName+" : "+error.ErrorMessage);
        }
    }
}

Answer 2

要查看EntityValidationErrors，请将以下监视表达式添加到您的wacth窗口：

((System.Data.Entity.Validation.DbEntityValidationException)$exception).EntityValidationErrors

一个或多个实体的MVC验证失败

2 个答案: