实体框架：datetime2数据类型到datetime数据类型的转换导致值C＃超出范围

Question

我有一个班级公告：

namespace WebApplication2.Models {

    public partial class Announcment {
        public int Id { get; set; }

        [DisplayName("Subject")]
        public String Subject { get; set; }

        [DataType(DataType.MultilineText)]
        [DisplayName("Content")]
        public String Text { get; set; }

        [DisplayName("Published")]
        public DateTime TimeStamp { get; set; }

        [DisplayName("Author")]
        public virtual ApplicationUser Author { get; set; }

    }
}

我就这样创建它 日期时间TimeStamp自动设置为DateTime.Now ：

 [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Create([Bind(Include = "Id,Subject,Text")] Announcment announcment) {
            if (ModelState.IsValid) {
                //MINE 
                var user = UserManager.FindById(User.Identity.GetUserId());
                Debug.WriteLine("USER" + user.Id);
                announcment.TimeStamp = DateTime.Now;
                announcment.Author = user;
                //
                db.Announcments.Add(announcment);
                db.SaveChanges();
                return RedirectToAction("Index");
            }

            return View(announcment);
        }

它的工作没有任何麻烦。 没有错误。

但是然后我要对其进行编辑。 用于编辑的视图如下所示。 这是Visual Studio 2013生成的标准Edit操作。我刚刚删除了@model.TimeStamp编辑器。

@model WebApplication2.Models.Announcment

@{
    ViewBag.Title = "Edit";
}

<h2>Edit</h2>

@using (Html.BeginForm())
{
    @Html.AntiForgeryToken()

    <div class="form-horizontal">
        <h4>Announcment</h4>
        <hr />
        @Html.ValidationSummary(true, "", new { @class = "text-danger" })
        @Html.HiddenFor(model => model.Id)

        <div class="form-group">
            @Html.LabelFor(model => model.Subject, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Subject, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Subject, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Text, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Text, new { htmlAttributes = new { @class = "form-control", rows =  8} })
                @Html.ValidationMessageFor(model => model.Text, "", new { @class = "text-danger" })
            </div>
        </div>


        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="submit" value="Save" class="btn btn-default" />
            </div>
        </div>
    </div>
}

<div>
    @Html.ActionLink("Back to List", "Index")
</div>

然后运行POST Edit方法。 我在这里所做的唯一一件事就是删除对,TimeStamp绑定,TimeStamp因为我没有对其进行编辑。 有或没有它我都得到相同的结果。

 [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Edit([Bind(Include = "Id,Subject,Text")] Announcment announcment) {
            if (ModelState.IsValid) {
                db.Entry(announcment).State = EntityState.Modified;
                db.SaveChanges();
                return RedirectToAction("Index");
            }
            return View(announcment);
        }

我得到这个邪恶的错误：

Błąd serwera w aplikacji '/'.

The conversion of a datetime2 data type to a datetime data type resulted in an out-of-range value.
The statement has been terminated. 
  Opis: Podczas wykonywania bieżącego żądania sieci Web wystąpił nieobsługiwany wyjątek. Aby uzyskać dodatkowe informacje o błędzie i miejscu jego występowania w kodzie, przejrzyj ślad stosu. 

 Szczegóły wyjątku: System.Data.SqlClient.SqlException: The conversion of a datetime2 data type to a datetime data type resulted in an out-of-range value.
The statement has been terminated.

Błąd źródła: 



Wiersz 86:                 Debug.WriteLine(announcment.TimeStamp);
Wiersz 87:                 db.Entry(announcment).State = EntityState.Modified;
Wiersz 88:                 db.SaveChanges();
Wiersz 89:                 return RedirectToAction("Index");
Wiersz 90:             }


 Plik źródłowy:  c:\Users\R\Documents\Visual Studio 2013\Projects\WebApplication2\WebApplication2\Controllers\AnnouncmentsController.cs    Wiersz:  88 

Ślad stosu: 



[SqlException (0x80131904): The conversion of a datetime2 data type to a datetime data type resulted in an out-of-range value.
The statement has been terminated.]
   System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) +1789294
   System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) +5340642
   System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) +244
   System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady) +1691
   System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) +275
   System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, SqlDataReader ds) +1421
   System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite) +177
   System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource`1 completion, String methodName, Boolean sendToPipe, Int32 timeout, Boolean asyncWrite) +208
   System.Data.SqlClient.SqlCommand.ExecuteNonQuery() +163
   System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.<NonQuery>b__0(DbCommand t, DbCommandInterceptionContext`1 c) +36
   System.Data.Entity.Infrastructure.Interception.InternalDispatcher`1.Dispatch(TTarget target, Func`3 operation, TInterceptionContext interceptionContext, Action`3 executing, Action`3 executed) +138
   System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.NonQuery(DbCommand command, DbCommandInterceptionContext interceptionContext) +476
   System.Data.Entity.Internal.InterceptableDbCommand.ExecuteNonQuery() +177
   System.Data.Entity.Core.Mapping.Update.Internal.DynamicUpdateCommand.Execute(Dictionary`2 identifierValues, List`1 generatedValues) +1382
   System.Data.Entity.Core.Mapping.Update.Internal.UpdateTranslator.Update() +236

[UpdateException: An error occurred while updating the entries. See the inner exception for details.]
   System.Data.Entity.Core.Mapping.Update.Internal.UpdateTranslator.Update() +488
   System.Data.Entity.Core.EntityClient.Internal.EntityAdapter.<Update>b__2(UpdateTranslator ut) +32
   System.Data.Entity.Core.EntityClient.Internal.EntityAdapter.Update(T noChangesResult, Func`2 updateFunction) +272
   System.Data.Entity.Core.EntityClient.Internal.EntityAdapter.Update() +143
   System.Data.Entity.Core.Objects.ObjectContext.<SaveChangesToStore>b__35() +34
   System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction(Func`1 func, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess) +448
   System.Data.Entity.Core.Objects.ObjectContext.SaveChangesToStore(SaveOptions options, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction) +219
   System.Data.Entity.Core.Objects.<>c__DisplayClass2a.<SaveChangesInternal>b__27() +71
   System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute(Func`1 operation) +211
   System.Data.Entity.Core.Objects.ObjectContext.SaveChangesInternal(SaveOptions options, Boolean executeInExistingTransaction) +408
   System.Data.Entity.Core.Objects.ObjectContext.SaveChanges(SaveOptions options) +39
   System.Data.Entity.Internal.InternalContext.SaveChanges() +320

[DbUpdateException: An error occurred while updating the entries. See the inner exception for details.]
   System.Data.Entity.Internal.InternalContext.SaveChanges() +366
   System.Data.Entity.Internal.LazyInternalContext.SaveChanges() +56
   System.Data.Entity.DbContext.SaveChanges() +52
   WebApplication2.Controllers.AnnouncmentsController.Edit(Announcment announcment) in c:\Users\R\Documents\Visual Studio 2013\Projects\WebApplication2\WebApplication2\Controllers\AnnouncmentsController.cs:88
   lambda_method(Closure , ControllerBase , Object[] ) +181
   System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters) +59
   System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +434
   System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +60
   System.Web.Mvc.Async.ActionInvocation.InvokeSynchronousActionMethod() +76
   System.Web.Mvc.Async.AsyncControllerActionInvoker.<BeginInvokeSynchronousActionMethod>b__39(IAsyncResult asyncResult, ActionInvocation innerInvokeState) +36
   System.Web.Mvc.Async.WrappedAsyncResult`2.CallEndDelegate(IAsyncResult asyncResult) +73
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +136
   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +102
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) +49
   System.Web.Mvc.Async.AsyncInvocationWithFilters.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f() +117
   System.Web.Mvc.Async.<>c__DisplayClass48.<InvokeActionMethodFilterAsynchronouslyRecursive>b__41() +323
   System.Web.Mvc.Async.<>c__DisplayClass33.<BeginInvokeActionMethodWithFilters>b__32(IAsyncResult asyncResult) +44
   System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +47
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +136
   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +102
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) +50
   System.Web.Mvc.Async.<>c__DisplayClass2b.<BeginInvokeAction>b__1c() +72
   System.Web.Mvc.Async.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult) +185
   System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +42
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +133
   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +56
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +40
   System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) +34
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +70
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +139
   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +59
   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +40
   System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +44
   System.Web.Mvc.Controller.<BeginExecute>b__15(IAsyncResult asyncResult, Controller controller) +39
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +62
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +139
   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +59
   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +40
   System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +39
   System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +39
   System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult asyncResult, ProcessRequestState innerState) +39
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +70
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +139
   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +59
   System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +40
   System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +40
   System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +38
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +9690172
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155




Informacje o wersji: Wersja Microsoft .NET Framework:4.0.30319; Wersja ASP.NET:4.0.30319.34009  

问题：什至不尝试编辑Announcment TimeStamp属性时，为什么会出现此异常？ 如何解决这个问题？

编辑：我发现即使我不尝试编辑原始日期，它也被神秘地设置为： 0001-01-01 00:00:00

Answer 1

在编辑帖子时，您还必须绑定TimeStamp属性，在空情况下，它将采用帖子中显示的值，因此如果您不希望用户更改它，请将其放在隐藏字段中：

@Html.HiddenFor(m=>m.TimeStamp)

否则，它将被发布为null，在这种情况下，它将在数据库端更改为0001-01-01 00:00:00 ，这是无效的DateTime并且您将获得异常