C# 指定的类型成员'；滴答声'；在LINQ to实体中不支持

我想将数据库保存到此对象

  var logDetail = new LogDetail()
                {
                    CreatorUserName = "RCM",
                    EntryDate = DateTime.Now,
                    LogId = desLogId,
                    FollowUpcode = ExtensionManager.Instance.GetFollowUpCode(),
                    InternalExtensionId = 1013,
                    IsSuccess = true,
                    LogDetailTime = DateTime.Now,
                    OperationId = Convert.ToInt32(ConfigurationManager.AppSettings["InternalOprationId"]),

但我得到了这个错误：

LINQ to中不支持指定的类型成员“Ticks” 实体。仅初始值设定项、实体成员和实体导航 支持属性

at System.Data.Objects.elink.ExpressionConverter.MemberAccessTranslator.TypedTranslate（ExpressionConverter父级，MemberExpression linq）
位于System.Data.Objects.Elink.ExpressionConverter.TypedTranslator`1.Translate（ExpressionConverter父级，表达式linq）
位于System.Data.Objects.Elink.ExpressionConverter.TranslateExpression（表达式linq）
位于System.Data.Objects.Elink.ExpressionConverter.EqualsTranslator.TypedTranslate（ExpressionConverter父级，二进制表达式linq）
位于System.Data.Objects.Elink.ExpressionConverter.TypedTranslator`1.Translate（ExpressionConverter父级，表达式linq）
位于System.Data.Objects.Elink.ExpressionConverter.TranslateExpression（表达式linq）
位于System.Data.Objects.Elink.ExpressionConverter.BinaryTranslator.TypedTranslate（ExpressionConverter父级，BinaryExpression linq）
位于System.Data.Objects.Elink.ExpressionConverter.TypedTranslator`1.Translate（ExpressionConverter父级，表达式linq）
位于System.Data.Objects.Elink.ExpressionConverter.TranslateExpression（表达式linq）
位于System.Data.Objects.Elink.ExpressionConverter.BinaryTranslator.TypedTranslate（ExpressionConverter父级，BinaryExpression linq）
位于System.Data.Objects.Elink.ExpressionConverter.TypedTranslator`1.Translate（ExpressionConverter父级，表达式linq）
位于System.Data.Objects.Elink.ExpressionConverter.TranslateExpression（表达式linq）
位于System.Data.Objects.elink.ExpressionConverter.TranslateLambda（LambdaExpression lambda，DbExpression input）
位于System.Data.Objects.eliq.ExpressionConverter.TranslateLambda（LambdaExpression lambda、DbExpression input、DbExpressionBinding&binding）
位于System.Data.Objects.Elink.ExpressionConverter.MethodCallTranslator.AggregateTranslator.Translate（ExpressionConverter父级，MethodCallExpression调用）
位于System.Data.Objects.Elink.ExpressionConverter.MethodCallTranslator.SequenceMethodTranslator.Translate（ExpressionConverter父级，MethodCallExpression调用，SequenceMethod SequenceMethod）
位于System.Data.Objects.Elink.ExpressionConverter.MethodCallTranslator.TypedTranslate（ExpressionConverter父级，MethodCallExpression linq）
位于System.Data.Objects.Elink.ExpressionConverter.TypedTranslator`1.Translate（ExpressionConverter父级，表达式linq）
位于System.Data.Objects.Elink.ExpressionConverter.TranslateExpression（表达式linq）
在System.Data.Objects.Elink.ExpressionConverter.Convert（）中
位于System.Data.Objects.elink.elinkQueryState.GetExecutionPlan（可为null `1 forMergeOption）
位于System.Data.Objects.ObjectQuery`1.GetResults（可为null`1 forMergeOption）
位于System.Data.Objects.ObjectQuery`1.System.Collections.Generic.IEnumerable.GetEnumerator（）
at System.Linq.Enumerable.Single[TSource]（IEnumerable`1 source）
在System.Data.Objects.Elink.ObjectQueryProvider.b__3[TResult]（IEnumerable`1序列）
在System.Data.Objects.Elink.ObjectQueryProvider.ExecuteSingle[TResult]（IEnumerable`1查询，表达式queryRoot）
位于System.Data.Objects.Elink.ObjectQueryProvider.System.Linq.IQueryProvider.Execute[S]（表达式）
位于System.Linq.Queryable.Count[TSource]（IQueryable`1源，表达式`1谓词）
位于Asa.CallCenter.DataAccess.Repository.LogDetailRepository.ExistLogDetail（Double logId，Int32 operationId，DateTime logDetailTime）
在Asa.CallCenter.Business.BusinessUnitOfWork.LogDetailUnitOfWork.ExistLogDetail（双logId，Int32 operationId，DateTime LogDetailTime）
位于Asa.CallCenter.Service.CallCenterService.ExistLogDetail（双logId，Int32 operationId，DateTime LogDetailTime）
在SyncInvokeExistLogDetail（对象，对象[]，对象[]）处
位于System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke（对象实例、对象[]输入、对象[]输出）
位于System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin（MessageRpc&rpc）
位于System.ServiceModel.Dispatcher.ImmutableDispatcheRuntime.ProcessMessage5（MessageRpc&rpc）
位于System.ServiceModel.Dispatcher.ImmutableDispatcheRuntime.ProcessMessage41（MessageRpc&rpc）
位于System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage4（MessageRpc&rpc）
位于System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage31（MessageRpc&rpc）
位于System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage3（MessageRpc&rpc）
位于System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage2（MessageRpc&rpc）
位于System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage11（MessageRpc&rpc）
位于System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage1（MessageRpc&rpc）
位于System.ServiceModel.Dispatcher.MessageRpc.Process（布尔isOperationContextSet）
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更新条目时出错。有关详细信息，请参见内部异常。
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位于System.Data.Mapping.Update.Internal.UpdateTranslator.Update（IEntityStateManager stateManager，IEntITYAAdapter适配器）
位于System.Data.EntityClient.EntityAdapter.Update（EntityStateManager entityCache）
位于System.Data.Objects.ObjectContext.SaveChanges（保存选项）
位于System.Data.Objects.ObjectContext.SaveChanges（）处
在RepoLib.RTS.Infra.UnitOfWork.EntityFrameWorkPersistAction.SaveChangeEfected（）处
在RepoLib.RTS.Infra.UnitOfWork.EntityFrameWorkPersistAction.Add[TE]（TE实体）
在RepoLib.RTS.Infra.EFDataAccessHelper.RepositoryManager.GenericRepository`1.Add[TE]（TE实体）
在Asa.CallCenter.DataAccess.Repository.LogDetailRepository.AddNewLogDetail（logdetaillogdetail）中
在Asa.CallCenter.Business.BusinessUnitOfWork.LogDetailUnitOfWork.AddNewLogDetail（LogDetailLogDetail）中
在Asa.CallCenter.Service.CallCenterService.AddNewLogDetail（L
   at System.Data.Objects.ELinq.ExpressionConverter.MemberAccessTranslator.TypedTranslate(ExpressionConverter parent, MemberExpression linq)
   at System.Data.Objects.ELinq.ExpressionConverter.TypedTranslator`1.Translate(ExpressionConverter parent, Expression linq)
   at System.Data.Objects.ELinq.ExpressionConverter.TranslateExpression(Expression linq)
   at System.Data.Objects.ELinq.ExpressionConverter.EqualsTranslator.TypedTranslate(ExpressionConverter parent, BinaryExpression linq)
   at System.Data.Objects.ELinq.ExpressionConverter.TypedTranslator`1.Translate(ExpressionConverter parent, Expression linq)
   at System.Data.Objects.ELinq.ExpressionConverter.TranslateExpression(Expression linq)
   at System.Data.Objects.ELinq.ExpressionConverter.BinaryTranslator.TypedTranslate(ExpressionConverter parent, BinaryExpression linq)
   at System.Data.Objects.ELinq.ExpressionConverter.TypedTranslator`1.Translate(ExpressionConverter parent, Expression linq)
   at System.Data.Objects.ELinq.ExpressionConverter.TranslateExpression(Expression linq)
   at System.Data.Objects.ELinq.ExpressionConverter.BinaryTranslator.TypedTranslate(ExpressionConverter parent, BinaryExpression linq)
   at System.Data.Objects.ELinq.ExpressionConverter.TypedTranslator`1.Translate(ExpressionConverter parent, Expression linq)
   at System.Data.Objects.ELinq.ExpressionConverter.TranslateExpression(Expression linq)
   at System.Data.Objects.ELinq.ExpressionConverter.TranslateLambda(LambdaExpression lambda, DbExpression input)
   at System.Data.Objects.ELinq.ExpressionConverter.TranslateLambda(LambdaExpression lambda, DbExpression input, DbExpressionBinding& binding)
   at System.Data.Objects.ELinq.ExpressionConverter.MethodCallTranslator.AggregateTranslator.Translate(ExpressionConverter parent, MethodCallExpression call)
   at System.Data.Objects.ELinq.ExpressionConverter.MethodCallTranslator.SequenceMethodTranslator.Translate(ExpressionConverter parent, MethodCallExpression call, SequenceMethod sequenceMethod)
   at System.Data.Objects.ELinq.ExpressionConverter.MethodCallTranslator.TypedTranslate(ExpressionConverter parent, MethodCallExpression linq)
   at System.Data.Objects.ELinq.ExpressionConverter.TypedTranslator`1.Translate(ExpressionConverter parent, Expression linq)
   at System.Data.Objects.ELinq.ExpressionConverter.TranslateExpression(Expression linq)
   at System.Data.Objects.ELinq.ExpressionConverter.Convert()
   at System.Data.Objects.ELinq.ELinqQueryState.GetExecutionPlan(Nullable`1 forMergeOption)
   at System.Data.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption)
   at System.Data.Objects.ObjectQuery`1.System.Collections.Generic.IEnumerable<T>.GetEnumerator()
   at System.Linq.Enumerable.Single[TSource](IEnumerable`1 source)
   at System.Data.Objects.ELinq.ObjectQueryProvider.<GetElementFunction>b__3[TResult](IEnumerable`1 sequence)
   at System.Data.Objects.ELinq.ObjectQueryProvider.ExecuteSingle[TResult](IEnumerable`1 query, Expression queryRoot)
   at System.Data.Objects.ELinq.ObjectQueryProvider.System.Linq.IQueryProvider.Execute[S](Expression expression)
   at System.Linq.Queryable.Count[TSource](IQueryable`1 source, Expression`1 predicate)
   at Asa.CallCenter.DataAccess.Repository.LogDetailRepository.ExistLogDetail(Double logId, Int32 operationId, DateTime logDetailTime)
   at Asa.CallCenter.Business.BusinessUnitOfWork.LogDetailUnitOfWork.ExistLogDetail(Double logId, Int32 operationId, DateTime LogDetailTime)
   at Asa.CallCenter.Service.CallCenterService.ExistLogDetail(Double logId, Int32 operationId, DateTime LogDetailTime)
   at SyncInvokeExistLogDetail(Object , Object[] , Object[] )
   at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs)
   at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage41(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage4(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage31(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage3(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage2(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage11(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage1(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)

***********
An error occurred while updating the entries. See the inner exception for details.
***********
   at System.Data.Mapping.Update.Internal.UpdateTranslator.Update(IEntityStateManager stateManager, IEntityAdapter adapter)
   at System.Data.EntityClient.EntityAdapter.Update(IEntityStateManager entityCache)
   at System.Data.Objects.ObjectContext.SaveChanges(SaveOptions options)
   at System.Data.Objects.ObjectContext.SaveChanges()
   at RepoLib.RTS.Infra.UnitOfWork.EntityFrameWorkPersistAction.SaveChangeEfected()
   at RepoLib.RTS.Infra.UnitOfWork.EntityFrameWorkPersistAction.Add[TE](TE entity)
   at RepoLib.RTS.Infra.EFDataAccessHelper.RepositoryManager.GenericRepository`1.Add[TE](TE entity)
   at Asa.CallCenter.DataAccess.Repository.LogDetailRepository.AddNewLogDetail(LogDetail logDetail)
   at Asa.CallCenter.Business.BusinessUnitOfWork.LogDetailUnitOfWork.AddNewLogDetail(LogDetail logDetail)
   at Asa.CallCenter.Service.CallCenterService.AddNewLogDetail(LogDetail logDetail)
   at SyncInvokeAddNewLogDetail(Object , Object[] , Object[] )
   at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs)
   at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage41(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage4(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage31(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage3(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage2(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage11(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage1(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)
***********
The INSERT statement conflicted with the FOREIGN KEY constraint "FK_LogDetail_Log". The conflict occurred in database "AgahRBS", table "clc.Log", column 'Id'.
The statement has been terminated.
***********
   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
   at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
   at System.Data.SqlClient.SqlDataReader.TryConsumeMetaData()
   at System.Data.SqlClient.SqlDataReader.get_MetaData()
   at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString)
   at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite)
   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite)
   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
   at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)
   at System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior)
   at System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior)
   at System.Data.Mapping.Update.Internal.DynamicUpdateCommand.Execute(UpdateTranslator translator, EntityConnection connection, Dictionary`2 identifierValues, List`1 generatedValues)
   at System.Data.Mapping.Update.Internal.UpdateTranslator.Update(IEntityStateManager stateManager, IEntityAdapter adapter)