Asp.net-core – Intermittent error with EF Core: The connection does not support MultipleActiveResultSets

asp.net-coreazure-sql-databaseentity-framework-core

I have an ASP.Net Core application that uses EF Core.

I use ASP.Net Identity and share the same DBContext for my app's entities.

I have set my connection string to an Azure SQL database to have MultipleActiveResultSet=True.

It works for a day or two, but eventually it fails with the error:

The connection does not support MultipleActiveResultSets.

I don't think MARS is the real issue since it worked for the first two days it was up.

I am using ASP.Net Core's built-in DI to set my DbContext. 

services.AddDbContext<AppDbContext>(options =>
  options.UseSqlServer(appDbContextConnectionString));

My understanding is that the default lifetime for the DbContext above is Transient (per web request).

Is it alright to share the same DBContext with ASP.Net Identity or should I have a separate one for my app's entities, pointed to the same DB?

I don't know if this is an issue with EF Core, ASP.Net Core or with SQL Azure configuration.

Best Answer

I had a similar issue and I found that the problem was that I missed an await statement in front of my method.

FetchStuffFromDBAsync();

Became:

await FetchStuffFromDBAsync();

And the problem was gone.

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