@@abp console project System.ObjectDisposedException: Cannot access a disposed context instance. A common cause of this error is disposing a context instance that was resolved from dependency injection and then later trying to use the same context instance elsewhere in your application. This may occur if you are calling 'Dispose' on the context instance, or wrapping it in a using statement. If you are using dependency injection, you should let the dependency injection container take care of disposing context instances.

System.ObjectDisposedException: Cannot access a disposed context instance #1753

Hello

I am getting this error when I try to use a EF Core Repository which is resolved using ServiceProvider in CustomTenantResolver.

System.ObjectDisposedException: Cannot access a disposed context instance. A common cause of this error is disposing a context instance that was resolved from dependency injection and then later trying to use the same context instance elsewhere in your application. This may occur if you are calling 'Dispose' on the context instance, or wrapping it in a using statement. If you are using dependency injection, you should let the dependency injection container take care of disposing context instances.

Thanks

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8 Answer(s)

• 
  0
  EngincanV created 2 years ago Support Team

  Hi @Mohammad, can you share where you used the repository (for example, your application service method)?

   
• 
  0
  Mohammad created 2 years ago  

  Hi

  I am using it in Custom Tenant Resolver.

   public class AccessTokenTenantResolver : HttpTenantResolveContributorBase
      {
          public override string Name => "AccessToken";
  
  
  
          protected override async Task GetTenantIdOrNameFromHttpContextOrNullAsync(ITenantResolveContext context, HttpContext httpContext)
          {
             
  
              IClientCredentialRepository clientCredentialRepository = context.ServiceProvider.GetRequiredService();
  
              string accessCode = httpContext.Request.Headers["Authorization"];
  
              if (!string.IsNullOrEmpty(accessCode))
              {
                  var token = accessCode.Split(" ")[1];
                  var tokenHandler = new JwtSecurityTokenHandler();
                  var tokens = tokenHandler.ReadJwtToken(token);
                  var client_id = tokens.Claims.FirstOrDefault(x => x.Type == "client_id").Value;
                  var scopes = tokens.Claims.FirstOrDefault(x => x.Type == "scope").Value;
  
                  if (scopes.Contains("Scope"))
                  {
                      var client = await clientCredentialRepository.SingleOrDefaultAsync(x => x.ClientId == client_id);
  
                      if (client == null)
                          return await Task.FromResult(null);
  
                     
                      return await Task.FromResult(client.TenantId.Value.ToString());
                  }
              }
  
              return await Task.FromResult("37fb7b60-0ba6-8109-70b1-a049e5f25575");
          }
      }
  

   
• 
  0
  EngincanV created 2 years ago Support Team

  Can you add the [UnitOfWork] attribute to above of your method and try it again?

   
• 
  0
  Mohammad created 2 years ago  

  I am getting the same error even after adding [UnitOfWork]

  2021-08-23 16:01:08.732 +03:00 [WRN] System.ObjectDisposedException: Cannot access a disposed context instance. A common cause of this error is disposing a context instance that was resolved from dependency injection and then later trying to use the same context instance elsewhere in your application. This may occur if you are calling 'Dispose' on the context instance, or wrapping it in a using statement. If you are using dependency injection, you should let the dependency injection container take care of disposing context instances.
  Object name: 'ClientManagementDbContext'.
     at Microsoft.EntityFrameworkCore.DbContext.CheckDisposed()
     at Microsoft.EntityFrameworkCore.DbContext.get_InternalServiceProvider()
     at Microsoft.EntityFrameworkCore.DbContext.get_ChangeTracker()
     at Microsoft.EntityFrameworkCore.Query.CompiledQueryCacheKeyGenerator.GenerateCacheKeyCore(Expression query, Boolean async)
     at Microsoft.EntityFrameworkCore.Query.RelationalCompiledQueryCacheKeyGenerator.GenerateCacheKeyCore(Expression query, Boolean async)
     at Npgsql.EntityFrameworkCore.PostgreSQL.Query.Internal.NpgsqlCompiledQueryCacheKeyGenerator.GenerateCacheKey(Expression query, Boolean async)
     at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.ExecuteAsync[TResult](Expression query, CancellationToken cancellationToken)
     at Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryProvider.ExecuteAsync[TResult](Expression expression, CancellationToken cancellationToken)
     at Microsoft.EntityFrameworkCore.EntityFrameworkQueryableExtensions.ExecuteAsync[TSource,TResult](MethodInfo operatorMethodInfo, IQueryable`1 source, Expression expression, CancellationToken cancellationToken)
     at Microsoft.EntityFrameworkCore.EntityFrameworkQueryableExtensions.ExecuteAsync[TSource,TResult](MethodInfo operatorMethodInfo, IQueryable`1 source, LambdaExpression expression, CancellationToken cancellationToken)
     at Microsoft.EntityFrameworkCore.EntityFrameworkQueryableExtensions.SingleOrDefaultAsync[TSource](IQueryable`1 source, Expression`1 predicate, CancellationToken cancellationToken)
     at Zenithr.Tenant.Shared.AccessTokenTenantResolver.GetTenantIdOrNameFromHttpContextOrNullAsync(ITenantResolveContext context, HttpContext httpContext) in C:\websites\ZENITHR3.0\Zenithr.Shared.Tenant\AccessTokenTenantResolver.cs:line 43
     at Volo.Abp.AspNetCore.MultiTenancy.HttpTenantResolveContributorBase.ResolveFromHttpContextAsync(ITenantResolveContext context, HttpContext httpContext)
     at Volo.Abp.AspNetCore.MultiTenancy.HttpTenantResolveContributorBase.ResolveAsync(ITenantResolveContext context)
  

   
• 
  1
  maliming created 2 years ago Support Team

  hi Mohammad

  Can you try this:

  using (var uow = _unitOfWorkManager.Begin()
  {
      var client = await clientCredentialRepository.SingleOrDefaultAsync(x => x.ClientId == client_id);
      await uow.CompleteAsync();
  }
  
  

   
• 
  1
  Mohammad created 2 years ago  

  the using statement worked.

  Why do I need to do the using for Unitofwork for the repository to work? can you explain? Is this a workaround or an actual solution?

   
• 
  1
  maliming created 2 years ago Support Team

  hi

  The GetTenantIdOrNameFromHttpContextOrNullAsync method not in a uow because the middleware order.

  And the AccessTokenTenantResolver is created by new instead of DI, so the [UnitOfWork] won't work

  

  In this case you need to create uow manually.

  

   
• 
  0
  Mohammad created 2 years ago  

  Thanks for the Explaination and refund.