Can we have multiple DbContext?
In code first, you can have multiple DBContext and just one database. You just have to specify the connection string in the constructor.
Should I use DbContext in controller?
It is the cleanest possible option and it relieves the controller any responsibility for the lifetime of the DbContext instance. When you think about it, the controller requires an instance of a DbContext, but it really shouldn’t care about where it comes from or where it goes when it is done with it.
What are the disadvantages of using static DbContext?
If you only use one DbContext instance and lock it for thread safety, so you only have one connection to DB. If your website have hundreds of request per second then all of them have to queue to use the only connection. In that case, DbContext object became the perfomance bottleneck of your system.
Does DbContext need to be disposed?
Although the DbContext implements IDisposable , you shouldn’t manually dispose it, nor should you wrap it in a using statement. DbContext manages its own lifetime; when your data access request is completed, DbContext will automatically close the database connection for you.
How to use dbcontext in separate class library?
Now write a a service collection extension method in your class library as follows: Now in the Startup.ConfigureServices of your client application as follows:
How to work with context in dbcontext-ef6?
The recommended way to work with context is to define a class that derives from DbContext and exposes DbSet properties that represent collections of the specified entities in the context. If you are working with the EF Designer, the context will be generated for you. If you are working with Code First, you will typically write the context yourself.
How is configuration passed from adddbcontext to dbcontext?
The ApplicationDbContext class must expose a public constructor with a DbContextOptions parameter. This is how context configuration from AddDbContext is passed to the DbContext. For example: ApplicationDbContext can then be used in ASP.NET Core controllers or other services through constructor injection.
Can a dbcontext be shared across multiple threads?
The context is not thread-safe, therefore it should not be shared across multiple threads doing work on it concurrently. If an exception causes the context to be in an unrecoverable state, the whole application may terminate.