我最近一直在學習asp.net MVC 5和EF6,我已經開始爲我的視圖開發viewmodels,而不是將值填入viewbag。ViewModel「沒有定義鍵」錯誤
我,這是我的視圖模型稱爲EmployeeCreate
namespace Rota.ViewModels
{
public class EmployeeCreate
{
public string FirstName { get; set; }
public string LastName { get; set; }
public IEnumerable<SelectListItem> Departments { get; set; }
}
}
我想要做的是在創建[httpget] action method
才能夠填充一個下拉列表
這是我員工 enitity
namespace Rota.Models
{
public class Employee
{
public int ID { get; set; }
[Required]
[Display(Name = "First Name")]
public string FirstName { get; set; }
[Required]
[Display(Name = "Last Name")]
public string LastName { get; set; }
[ForeignKey("Department")]
[DisplayFormat(NullDisplayText="No Department")]
public int? DepartmentID { get; set; }
public virtual Department Department { get; set; }
public virtual ICollection<Schedule> Schedule { get; set; }
}
}
這是我的部實體
namespace Rota.Models
{
public class Department
{
[DatabaseGenerated(DatabaseGeneratedOption.None)]
public int ID { get; set; }
[Required]
public string Name { get; set; }
public virtual ICollection<Employee> Employees { get; set; }
}
}
編輯這是我的DbContext類
public class RotaContext : DbContext
{
public RotaContext() : base("RotaContext")
{
}
public DbSet<Department> Departments { get; set; }
public DbSet<Shift> Shifts { get; set; }
public DbSet<Employee> Employees { get; set; }
public DbSet<Schedule> Scheduled { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
}
public System.Data.Entity.DbSet<Rota.ViewModels.EmployeeCreate> CreateEmployeeViewModels { get; set; }
}
這是我在我的控制器
namespace Rota.Controllers
{
public class EmployeeController : Controller
{
//establish database connection
private RotaContext db = new RotaContext();
//GET: Employee/Create
[HttpGet]
public ActionResult Create()
{
EmployeeCreate ViewModel = new EmployeeCreate()
{
Departments = db.Departments.Select(department => new SelectListItem {
Value = department.ID.ToString(),
Text = department.Name
})
};
return View(ViewModel);
}
}
}
麻煩我」創建行動方法已經得到的是,我不斷收到此錯誤:模型生成過程中檢測到
一個或多個驗證錯誤:
Rota.Entities.EmployeeCreate:的EntityType「EmployeeCreate」沒有定義鍵 。定義此EntityType的關鍵字。 CreateEmployeeViewModels: EntityType:EntitySet'CreateEmployeeViewModels'基於 'EmployeeCreate',它沒有定義鍵。
我不知道爲什麼應用程序認爲我的視圖模型是一個實體,我看不到任何東西在這裏,我想我是從數據庫填充的對象與值可能顯示爲這樣,據我所知,並且因爲視圖模型與除此以外的實體完全沒有關聯,所以它不需要密鑰,因爲它不需要唯一的標識符。
完整堆棧跟蹤
[ModelValidationException:
Rota.Entities.EmployeeCreate::一個或多個驗證錯誤模型生成過程中檢測到 :的EntityType 'EmployeeCreate' 沒有定義鍵 。定義此EntityType的關鍵字。 CreateEmployeeViewModels: EntityType:EntitySet'CreateEmployeeViewModels'基於 'EmployeeCreate',它沒有定義鍵。 ]
System.Data.Entity.Core.Metadata.Edm.EdmModel.Validate()+338
System.Data.Entity.DbModelBuilder。構建(DbProviderManifest providerManifest,DbProviderInfo providerInfo)+370
System.Data.Entity.DbModelBuilder.Build(的DbConnection providerConnection)+ 288
System.Data.Entity.Internal.LazyInternalContext.CreateModel(LazyInternalContext internalContext)+94
System.Data.Entity.Internal.RetryLazy2.GetValue(TInput input) +248
1.Initialize()72
System.Data.Entity.Internal.LazyInternalContext.InitializeContext() +543 System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType) +26
System.Data.Entity.Internal.Linq.InternalSet
System.Data.Entity.Internal.Linq.InternalSet1.get_InternalContext() +21 System.Data.Entity.Infrastructure.DbQuery
1.System.Linq.IQueryable.get_Provider() 64 System.Linq的。 Queryable.Select(IQueryable1 source, Expression
1 selector)+85 Rota.Controllers.EmployeeController.Create()in d:\ Dev elopment \羅塔島\羅塔島\控制器\ EmployeeController.cs:87
lambda_method(封閉,ControllerBase,對象[])79
System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext,IDictionary的參數)+ 39
System.Web.Mvc.Async.AsyncControllerActionInvoker.b__39(IAsyncResult的 asyncResult,ActionInvocation innerInvokeState)12
System.Web.Mvc.Async.WrappedAsyncResult2.CallEndDelegate(IAsyncResult asyncResult) +139
1.CallEndDelegate(IAsyncResult的 asyncResult)111
System.Web.Mvc.Async.AsyncInvocationWithFilters.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3d() +112 System.Web.Mvc.Async.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f() +452 System.Web.Mvc.Async.<>c__DisplayClass33.<BeginInvokeActionMethodWithFilters>b__32(IAsyncResult asyncResult) +15
System.Web.Mvc.Async.<>c__DisplayClass2b.<BeginInvokeAction>b__1c() +37 System.Web.Mvc.Async.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult) +241
System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) +29
System.Web.Mvc.Async.WrappedAsyncVoid
系統。 Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult)+53 System.Web.Mvc.Async.WrappedAsyncVoid1.CallEndDelegate(IAsyncResult asyncResult) +19
1.CallEndDelegate(IAsyncResult的 asyncResult)111
System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult asyncResult, ProcessRequestState innerState) +51
System.Web.Mvc.Async.WrappedAsyncVoid
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() 606 System.Web.HttpApplication.ExecuteStep (IExecutionStep一步,布爾& completedSynchronously)+ 288
你能展示完整的堆棧嗎? –