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请不要将此标记为重复，因为这似乎与其他堆栈溢出问题不同。

我的代码看起来很完美，也可以按预期工作，但有时会引发异常。这是代码

try
{
    using (var db = new ClubrContext())
    {
        var notificationService = new PushNotificationService(_logger);
        var sendMailService = new SendMailService(_logger);
        var smsService = new SMSService(_logger, sendMailService);
        var reminderService = new GuestQuestionReminderService(notificationService, _logger, db, smsService);
        await reminderService.SendReminders();
    }
}
catch (Exception ex)
{

}

SendReminder 函数的代码如下所示 -

public class GuestQuestionReminderService : BaseReminderService
{
    public GuestQuestionReminderService(IPushNotificationService notificationService, ILoggerService loggerService, ClubrContext dbContext, ISMSService smsService) :
        base(notificationService, loggerService, dbContext, smsService)
    {            
    }
    public async Task SendReminders()
    {
        try
        {
            var groups = DbContext.Groups
                .Include("Messages")
                .Include("Admin")
                .Include("Admin.Profile")
                .Include("Promoter")
                .Include("Promoter.Profile")
                .Where(x => !x.Deleted && x.PartyDate >= DateTime.Today && x.Offers.Any() && x.Offers.Any(offer => offer.IsAccepted && !offer.Deleted))
                .ToList();

            foreach (var group in groups)
            {
                var offer = group.Offers.FirstOrDefault(x => x.IsAccepted && !x.Deleted);
                var lastPromoterMessageDate = offer.Messages.OrderByDescending(x => x.MessageDate).FirstOrDefault(x => x.FromUserId == group.PromoterId)?.MessageDate;
               lastPromoterMessageDate = lastPromoterMessageDate ?? DateTime.MinValue;
                var recentAdminMessages = offer.Messages.Where(x => x.FromUserId == group.AdminId && x.MessageDate > lastPromoterMessageDate).ToList();            
            }
        }
        catch (Exception ex)
        {
            LoggerService.Error(ex, ex.StackTrace);
        }
    }
}

乍一看，一切似乎都是正确的。所有对数据库的调用都在 using 语句中，但抛出异常！

我在一个论坛上读到这可能是因为连接字符串不正确，但我不确定这是否正确。仍然在这里提供连接字符串 -

Data Source=[Data Source];Initial Catalog=[Database];User ID=[User Id];Password=[Password];MultipleActiveResultSets=true;

这是异常堆栈跟踪 -

System.InvalidOperationException: The operation cannot be completed because the DbContext has been disposed.
System.InvalidOperationException: The operation cannot be completed because the DbContext has been disposed.
at System.Data.Entity.Internal.LazyInternalContext.InitializeContext()at System.Data.Entity.Internal.LazyInternalContext.GetObjectContextWithoutDatabaseInitialization()
at System.Data.Entity.Internal.InternalContext.UpdateEntitySetMappingsForType(Type entityType)
at System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType)
at System.Data.Entity.Internal.Linq.InternalSet`1.Initialize()
at System.Data.Entity.Internal.Linq.InternalSet`1.Include(String path)
at System.Data.Entity.Infrastructure.DbQuery`1.Include(String path)     
at System.Data.Entity.Internal.LazyInternalContext.InitializeContext()
at System.Data.Entity.Internal.LazyInternalContext.GetObjectContextWithoutDatabaseInitialization()
at System.Data.Entity.Internal.InternalContext.UpdateEntitySetMappingsForType(Type entityType)
at System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType)
at System.Data.Entity.Internal.Linq.InternalSet`1.Initialize()
at System.Data.Entity.Internal.Linq.InternalSet`1.Include(String path)
at System.Data.Entity.Infrastructure.DbQuery`1.Include(String path)
at Clubr.WebJobs.ClubListingSchedule.Services.GuestQuestionReminderService.<SendReminders>d__1.MoveNext() in C:\sourcecode\clbr\Source\Clubr.WebJobs.ClubListingSchedule\Services\GuestQuestionReminderService.cs:line 24at System.Data.Entity.Internal.LazyInternalContext.InitializeContext()
at System.Data.Entity.Internal.LazyInternalContext.GetObjectContextWithoutDatabaseInitialization()
at System.Data.Entity.Internal.InternalContext.UpdateEntitySetMappingsForType(Type entityType)
at System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType)
at System.Data.Entity.Internal.Linq.InternalSet`1.Initialize()
at System.Data.Entity.Internal.Linq.InternalSet`1.Include(String path)
at System.Data.Entity.Infrastructure.DbQuery`1.Include(String path)
at Clubr.WebJobs.ClubListingSchedule.Services.GuestQuestionReminderService.<SendReminders>d__1.MoveNext() in C:\sourcecode\clbr\Source\Clubr.WebJobs.ClubListingSchedule\Services\GuestQuestionReminderService.cs:line 24     at System.Data.Entity.Internal.LazyInternalContext.InitializeContext()
at System.Data.Entity.Internal.LazyInternalContext.GetObjectContextWithoutDatabaseInitialization()
at System.Data.Entity.Internal.InternalContext.UpdateEntitySetMappingsForType(Type entityType)
at System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType)
at System.Data.Entity.Internal.Linq.InternalSet`1.Initialize()
at System.Data.Entity.Internal.Linq.InternalSet`1.Include(String path)
at System.Data.Entity.Infrastructure.DbQuery`1.Include(String path)
at Clubr.WebJobs.ClubListingSchedule.Services.GuestQuestionReminderService.<SendReminders>d__1.MoveNext() in C:\sourcecode\clbr\Source\Clubr.WebJobs.ClubListingSchedule\Services\GuestQuestionReminderService.cs:line 24

和 BaseService 代码 -

public class BaseReminderService
{
    protected static IPushNotificationService NotificationService;
    protected static ILoggerService LoggerService;
    protected static ISMSService SmsService;
    protected static ClubrContext DbContext;

    public BaseReminderService(IPushNotificationService notificationService, ILoggerService loggerService, ClubrContext dbContext,
        ISMSService smsService)
    {
        NotificationService = notificationService;
        LoggerService = loggerService;
        DbContext = dbContext;
        SmsService = smsService;
    }
}`

现在看BaseService的代码，似乎问题是因为使用了静态变量！

我保持问题开放，所以我知道我的想法是正确的。（另外，如果你能回答，因为它是一个静态变量，它是否在可能并行运行的多个进程/线程之间共享！

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0 回答 0