Repository - открыть DataReader, связанный с этой командой, которая должна быть закрыта первой

Question

У меня есть метод для запуска игры написанной в MVC с Entity Framework, и это было по Repository и блоку работ:

public Team StartTeam(Message message, out string result) 
    { 
     try 
     { 
      var player = GetPlayer(message); 
      if (player.StatusId == (int)Status.Playing) 
      { 
       result = Mesages.CantStartGameDuringAnotherGame; 
       return null; 
      } 
      var team = Uow.TeamContext.FindBy(q => q.Name == message.Text).FirstOrDefault(); 
      if (team == null) 
      { 
       result = Mesages.UnexpectedError; 
       return null; 
      } 
      var members = Uow.MembershipContext.FindBy(q => q.TeamId == team.Id); 
      var players = new List<Player>(); 
      foreach (var member in members.Where(q => q.PlayerId != player.Id)) 
      { 
       var pl = Uow.PlayerContext.GetSingle(member.PlayerId); 
       if (player.StatusId == (int)Status.Active) 
        players.Add(pl); 
      } 
      players.Add(player); 
      player.StatusId = (int)Status.Active; 
      if (players.Count < 2) 
      { 
       result = Mesages.NotEnoughPlayers; 
       return null; 
      } 
      var race = new Race() 
      { 
       TeamId = team.Id, 
       PlayDate = DateTime.Now 
      }; 
      race = Uow.RaceContext.Add(race); 
      Uow.Save(); 
      team.CurrentRaceId = race.Id; 
      foreach (var playr in players) 
      { 
       playr.StatusId = 
        members.First(q => q.PlayerId == playr.Id).StatusId 
         = (int)Status.Playing; 
       playr.CurrentTeamId = team.Id; 
      } 
      result = Mesages.TeamStartedSuccessfuly; 
      player.StatusId = (int)Status.Playing; 
      return team; 
     } 
     catch (Exception ex) 
     { 
      SaveException(ex); 
      return null; 
     } 
    } 

Каждых вещи кажется, будет хорошо, и я могу запустить его в мой местный, но когда я публикую его я дал эту ошибку:

There is already an open DataReader associated with this Command which must be closed first. 

Это полный трассировки стека:

System.Data.Entity.Core.EntityCommandExecutionException: An error occurred while executing the command definition. See the inner exception for details. ---> System.InvalidOperationException: There is already an open DataReader associated with this Command which must be closed first. 
    at System.Data.SqlClient.SqlInternalConnectionTds.ValidateConnectionForExecute(SqlCommand command) 
    at System.Data.SqlClient.SqlConnection.ValidateConnectionForExecute(String method, SqlCommand command) 
    at System.Data.SqlClient.SqlCommand.ValidateCommand(String method, Boolean async) 
    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.Entity.Infrastructure.Interception.DbCommandDispatcher.<Reader>b__c(DbCommand t, DbCommandInterceptionContext`1 c) 
    at System.Data.Entity.Infrastructure.Interception.InternalDispatcher`1.Dispatch[TTarget,TInterceptionContext,TResult](TTarget target, Func`3 operation, TInterceptionContext interceptionContext, Action`3 executing, Action`3 executed) 
    at System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.Reader(DbCommand command, DbCommandInterceptionContext interceptionContext) 
    at System.Data.Entity.Internal.InterceptableDbCommand.ExecuteDbDataReader(CommandBehavior behavior) 
    at System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior) 
    at System.Data.Entity.Core.EntityClient.Internal.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior) 
    --- End of inner exception stack trace --- 
    at System.Data.Entity.Core.EntityClient.Internal.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior) 
    at System.Data.Entity.Core.Objects.Internal.ObjectQueryExecutionPlan.Execute[TResultType](ObjectContext context, ObjectParameterCollection parameterValues) 
    at System.Data.Entity.Core.Objects.ObjectQuery`1.<>c__DisplayClass7.<GetResults>b__6() 
    at System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction[T](Func`1 func, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess) 
    at System.Data.Entity.Core.Objects.ObjectQuery`1.<>c__DisplayClass7.<GetResults>b__5() 
    at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute[TResult](Func`1 operation) 
    at System.Data.Entity.Core.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption) 
    at System.Data.Entity.Core.Objects.ObjectQuery`1.<System.Collections.Generic.IEnumerable<T>.GetEnumerator>b__0() 
    at System.Data.Entity.Internal.LazyEnumerator`1.MoveNext() 
    at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source) 
    at System.Data.Entity.Core.Objects.ELinq.ObjectQueryProvider.<GetElementFunction>b__1[TResult](IEnumerable`1 sequence) 
    at System.Data.Entity.Core.Objects.ELinq.ObjectQueryProvider.ExecuteSingle[TResult](IEnumerable`1 query, Expression queryRoot) 
    at System.Data.Entity.Core.Objects.ELinq.ObjectQueryProvider.System.Linq.IQueryProvider.Execute[TResult](Expression expression) 
    at System.Data.Entity.Internal.Linq.DbQueryProvider.Execute[TResult](Expression expression) 
    at System.Linq.Queryable.FirstOrDefault[TSource](IQueryable`1 source, Expression`1 predicate) 
    at EsmFamilWebHoook.Models.PlayerRepository.GetSingle(Int32 playerId) 
    at EsmFamilWebHoook.DatabaseService.StartTeam(Message message, String& result) 

Что случилось? Я видел this post, но не помог мне!

Answer 1

Может быть, что ваш запрос:

var pl = Uow.PlayerContext.GetSingle(member.PlayerId); 

помещается внутри Еогеасп какие перебирает результат другого запроса (но этот запрос может все еще быть активным - может это прочитать только первую партию строк или делать некоторые отложенная загрузка):

foreach (var member in Uow.MembershipContext.FindBy(q => q.TeamId == team.Id).Where(q => q.PlayerId != player.Id)) 

Попытка заставить результат первого запроса, чтобы быть полностью загружена в память сначала с помощью .ToArray(), например:

foreach (var member in Uow.MembershipContext.FindBy(q => q.TeamId == team.Id).Where(q => q.PlayerId != player.Id).ToArray()) 

Обычно у вас может быть 1 запрос активным во времени.