我似乎无法使用我的种子方法获取update-database来填充我的数据库。
我正在使用EF应用程序编写MVC4，现在正在使用EF将其升级到MVC5。以前在MVC4中我必须创建一个名为User.cs的类，但在使用Identity的MVC5中，我们需要从UserUser派生User类。
我使用的代码与我对MVC4配置文件完全相同，只是更改了：
var users = new List<User>
到
var users = new List<ApplicationUser>
和
new User{ FirstMi....
到
new ApplicationUser { FirstMi....
错误在第61行，就在这里
users.ForEach（s =＆gt; context.Users.AddOrUpdate（p =＆gt; p.FirstMidName，s））; context.SaveChanges（）
PM> Update-Database
Specify the '-Verbose' flag to view the SQL statements being applied to the target database.
No pending explicit migrations.
Running Seed method.
System.Data.Entity.Validation.DbEntityValidationException: Validation failed for one or more entities. See 'EntityValidationErrors' property for more details.
at System.Data.Entity.Internal.InternalContext.SaveChanges()
at System.Data.Entity.Internal.LazyInternalContext.SaveChanges()
at System.Data.Entity.DbContext.SaveChanges()
at RecreationalServicesTicketingSystem.Migrations.Configuration.Seed(ApplicationDbContext context) in C:\Users\Jason\Documents\Visual Studio 2015\Projects\RecreationalServicesTicketingSystem\RecreationalServicesTicketingSystem\Migrations\Configuration.cs:line 62
at System.Data.Entity.Migrations.DbMigrationsConfiguration`1.OnSeed(DbContext context)
at System.Data.Entity.Migrations.DbMigrator.SeedDatabase()
at System.Data.Entity.Migrations.Infrastructure.MigratorLoggingDecorator.SeedDatabase()
at System.Data.Entity.Migrations.DbMigrator.Upgrade(IEnumerable`1 pendingMigrations, String targetMigrationId, String lastMigrationId)
at System.Data.Entity.Migrations.Infrastructure.MigratorLoggingDecorator.Upgrade(IEnumerable`1 pendingMigrations, String targetMigrationId, String lastMigrationId)
at System.Data.Entity.Migrations.DbMigrator.UpdateInternal(String targetMigration)
at System.Data.Entity.Migrations.DbMigrator.<>c__DisplayClassc.<Update>b__b()
at System.Data.Entity.Migrations.DbMigrator.EnsureDatabaseExists(Action mustSucceedToKeepDatabase)
at System.Data.Entity.Migrations.Infrastructure.MigratorBase.EnsureDatabaseExists(Action mustSucceedToKeepDatabase)
at System.Data.Entity.Migrations.DbMigrator.Update(String targetMigration)
at System.Data.Entity.Migrations.Infrastructure.MigratorBase.Update(String targetMigration)
at System.Data.Entity.Migrations.Design.ToolingFacade.UpdateRunner.Run()
at System.AppDomain.DoCallBack(CrossAppDomainDelegate callBackDelegate)
at System.AppDomain.DoCallBack(CrossAppDomainDelegate callBackDelegate)
at System.Data.Entity.Migrations.Design.ToolingFacade.Run(BaseRunner runner)
at System.Data.Entity.Migrations.Design.ToolingFacade.Update(String targetMigration, Boolean force)
at System.Data.Entity.Migrations.UpdateDatabaseCommand.<>c__DisplayClass2.<.ctor>b__0()
at System.Data.Entity.Migrations.MigrationsDomainCommand.Execute(Action command)
Validation failed for one or more entities. See 'EntityValidationErrors' property for more details.
IdentityModel.cs（包含我的用户类的代码段）
public class ApplicationUser
: IdentityUser<int, ApplicationUserLogin,
ApplicationUserRole, ApplicationUserClaim>, IUser<int>
{
public async Task<ClaimsIdentity>
GenerateUserIdentityAsync(UserManager<ApplicationUser, int> manager)
{
var userIdentity = await manager
.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);
return userIdentity;
}
public bool IsAdministrator { get; set; }
[StringLength(50, MinimumLength = 1)]
public string LastName { get; set; }
[StringLength(50, MinimumLength = 1, ErrorMessage = "First name cannot be longer than 50 characters.")]
[Column("FirstName")]
public string FirstMidName { get; set; }
public string FullName
{
get { return FirstMidName + " " + LastName; }
}
[DataType(DataType.Date)]
[DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)]
public DateTime EnrollmentDate { get; set; }
public int DepartmentID { get; set; }
[ForeignKey("DepartmentID")]
public virtual Department Department { get; set; }
public int DepotID { get; set; }
[ForeignKey("DepotID")]
public virtual Depot Depot { get; set; }
public virtual ICollection<Ticket> Tickets { get; set; }
}
Configuration.cs（种子方法）
internal sealed class Configuration : DbMigrationsConfiguration<RecreationalServicesTicketingSystem.Models.ApplicationDbContext>
{
public Configuration()
{
AutomaticMigrationsEnabled = false;
}
protected override void Seed(ApplicationDbContext context)
{
var departments = new List<Department>
{
new Department { DepartmentID = 1, DepartmentName = "IT"},
new Department { DepartmentID = 2, DepartmentName = "Menzit Admin" },
new Department { DepartmentID = 3, DepartmentName = "Human Resources"},
new Department { DepartmentID = 4, DepartmentName = "Mechanics" },
new Department { DepartmentID = 5, DepartmentName = "Directors" },
new Department { DepartmentID = 6, DepartmentName = "Operations"}
};
departments.ForEach(s => context.Departments.AddOrUpdate(p => p.DepartmentName, s));
context.SaveChanges();
var depots = new List<Depot>
{
new Depot { DepotID = 1, DepotName = "Porana"},
new Depot { DepotID = 2, DepotName = "Far North"},
new Depot { DepotID = 3, DepotName = "Horowhenua"},
new Depot { DepotID = 4, DepotName = "Manawatu"},
new Depot { DepotID = 5, DepotName = "Silverdale"},
new Depot { DepotID = 6, DepotName = "Christchurch"},
};
depots.ForEach(s => context.Depots.AddOrUpdate(p => p.DepotName, s));
context.SaveChanges();
var users = new List<ApplicationUser>
{
new ApplicationUser { FirstMidName = "Jason", LastName = "Wan",
EnrollmentDate = DateTime.Parse("2016-02-18"), DepartmentID = 1, DepotID = 1,IsAdministrator = true},
new ApplicationUser { FirstMidName = "Andy", LastName = "Domagas",
EnrollmentDate = DateTime.Parse("2016-02-18"), DepartmentID = 1,DepotID = 1,IsAdministrator = true},
new ApplicationUser { FirstMidName = "Denis", LastName = "Djohar",
EnrollmentDate = DateTime.Parse("2016-02-18"), DepartmentID = 1 ,DepotID = 1,IsAdministrator = true },
new ApplicationUser { FirstMidName = "Christine", LastName = "West",
EnrollmentDate = DateTime.Parse("2016-02-18"), DepartmentID = 2, DepotID = 3,IsAdministrator = false},
};
users.ForEach(s => context.Users.AddOrUpdate(p => p.FirstMidName, s));
context.SaveChanges(); <--ERROR HERE
users.ForEach(s => context.Users.AddOrUpdate(p => p.LastName, s));
context.SaveChanges();
var categories = new List<Category>
{
new Category {CategoryID = 0001, CategoryName = "Desktop"},
new Category {CategoryID = 0002, CategoryName = "Mobile"},
new Category {CategoryID = 0003, CategoryName = "Menzits"},
new Category {CategoryID = 0004, CategoryName = "XMPRO"},
new Category {CategoryID = 0005, CategoryName = "Con-X"},
new Category {CategoryID = 0006, CategoryName = "Promapp"},
new Category {CategoryID = 0007, CategoryName = "QGIS"},
};
categories.ForEach(s => context.Categories.AddOrUpdate(p => p.CategoryName, s));
context.SaveChanges();
var tickets = new List<Ticket>
{
new Ticket {
UserID = users.Single(s => s.LastName == "Wan").Id, //UserID
CategoryID = categories.Single(c => c.CategoryName == "Con-X" ).CategoryID,
Issue = ("Con-X Login Error"),
Priority = Priority.High
},
new Ticket {
UserID = users.Single(s => s.LastName == "Wan").Id, //UserID
CategoryID = categories.Single(c => c.CategoryName == "Desktop" ).CategoryID,
Issue = ("Can't remote access C0123"),
Priority = Priority.Med
},
};
foreach (Ticket e in tickets)
{
var ticketInDataBase = context.Tickets.Where(
s =>
s.User.Id == e.UserID && //UserID
s.Category.CategoryID == e.CategoryID).SingleOrDefault();
if (ticketInDataBase == null)
{
context.Tickets.Add(e);
}
}
context.SaveChanges();
}
}
答案 0 :(得分：6)
因为错误说你必须检查实体验证错误，
try
{
db.Entity.Add(entity);
db.SaveChanges();
}
catch (DbEntityValidationException dbEx)
{
foreach (var validationErrors in dbEx.EntityValidationErrors)
{
foreach (var validationError in validationErrors.ValidationErrors)
{
System.Console.WriteLine("Property: {0} Error: {1}", validationError.PropertyName, validationError.ErrorMessage);
}
}
}
答案 1 :(得分：5)
一个简单的解决方案是将此行添加到监视窗口：
((System.Data.Entity.Validation.DbEntityValidationException)$exception).EntityValidationErrors
但我的猜测是错误来自 ApplicationUser 的 UserName 属性，您需要在添加新用户时给它一个值：）
我希望它有所帮助。
答案 2 :(得分：0)
只需分享我的案例-首先编写代码
我有一个context.AddOrUpdate(entity)，可以异步更新/添加实体。这意味着此后我仅在“程序包管理器控制台”窗口中收到错误，而我对此无能为力。尝试捕获未捕获到异常，因为它是事后发生的。
我只是在context.SaveChanges()之后立即添加了AddOrUpdate，这立即引发异常，然后我能够检查异常的EntityValidationErrors并找出问题所在。听起来简单/显而易见，但这确实对我有所帮助。