tenantRepository.GetListAsync return error: object reference not set to an instance of an object #4061

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• 

  0

  maliming created 4 years ago

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  hi

  Can you share the code of background worker?

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  0

  zhongfang created 4 years ago

  public class FansJoinedNotifierWorkItem : AsyncPeriodicBackgroundWorkerBase
  {
      public FansJoinedNotifierWorkItem(AbpAsyncTimer timer, IServiceScopeFactory serviceScopeFactory) : base(timer, serviceScopeFactory)
      {
          this.Timer.Period = 60 * 1000;
      }
  
      protected async override Task DoWorkAsync(PeriodicBackgroundWorkerContext workerContext)
      {
          this.Timer.Period = 1440 * 60 * 1000;
  
          扫码关注送积分 subscribPoint = new 扫码关注送积分();
          subscribPoint.LazyServiceProvider = this.LazyServiceProvider;
          await this.FansSubscribedPoint();
          
          this.Timer.Period = siteOptions.Value.UserFollowNotifyIntervalMinutes * 60 * 1000;
      }
  
      static List<Tenant> allTenants;
      public async Task FansSubscribedPoint()
      {
          Log.Information("Starting: 【扫码关注】积分发放...");
          
          IDataFilter dataFilter = this.LazyServiceProvider.LazyGetRequiredService<IDataFilter>();
  
          if (allTenants == null)
          {
              using (dataFilter.Disable<IMultiTenant>())
              {
                  ITenantRepository tenantRepository = this.LazyServiceProvider.LazyGetRequiredService<ITenantRepository>();
  
                  allTenants = await tenantRepository.GetListAsync();
              }
          }
  
          ……
  
          Log.Information("Completed: 【扫码关注】积分发放...");
      }
  }
  

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  0

  zhongfang created 4 years ago

  and I try another way,

              ICurrentTenant currentTenant = this.LazyServiceProvider.LazyGetRequiredService<ICurrentTenant>();
              ITenantRepository tenantRepository = this.LazyServiceProvider.LazyGetRequiredService<ITenantRepository>();
  
              if (allTenants == null)
              {
                  using (currentTenant.Change(null))
                  {
                      allTenants = await tenantRepository.GetListAsync();
                  }
              }
  

  got the same error again: Object reference not set to an instance of an object.

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  0

  maliming created 4 years ago

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  Object reference not set to an instance of an object.

  Full error stack?

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  0

  zhongfang created 4 years ago

  2022-11-17 11:10:23.791 +08:00 [INF] Starting: 【扫码关注】积分发放... 2022-11-17 11:10:46.619 +08:00 [ERR] Object reference not set to an instance of an object. System.NullReferenceException: Object reference not set to an instance of an object. at Yee.Change.AdminBlazorUI.WorkItems.FansJoinedNotifierWorkItem.FansSubscribedPoint() in D:\dev\abp\change\admin-blazor-ui\src\Yee.Change.AdminBlazorUI.Application\WorkItems\FansJoinedNotifierWorkItem.cs:line 97 at Yee.Change.AdminBlazorUI.WorkItems.FansJoinedNotifierWorkItem.DoWorkAsync(PeriodicBackgroundWorkerContext workerContext) in D:\dev\abp\change\admin-blazor-ui\src\Yee.Change.AdminBlazorUI.Application\WorkItems\FansJoinedNotifierWorkItem.cs:line 56 at Volo.Abp.BackgroundWorkers.AsyncPeriodicBackgroundWorkerBase.DoWorkAsync(CancellationToken cancellationToken) 2022-11-17 11:10:51.016 +08:00 [INF] Initialized all ABP modules.

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  0

  maliming created 4 years ago

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  Please set a breaking point to check which object is null/

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  0

  zhongfang created 4 years ago

  Oh...

  ITenantRepository tenantRepository = this.LazyServiceProvider.LazyGetRequiredService<ITenantRepository>();

  tenantRepository is null

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  0

  maliming created 4 years ago

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  Can you reproduce the problem in a new template project? liming.ma@volosoft.com

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  0

  zhongfang created 4 years ago

  No restrict to get the service of ITenantRepository?

  Can I get the ITenantRepository anywhere especially in backgroun worker class?

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  0

  maliming created 4 years ago

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  We need to check the project.

  https://support.abp.io/QA/Questions/4061#answer-1ab3be6e-393d-7ab9-13c2-3a0796233132

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