Autofac ResolvedParameter/ComponentContext not working

Question

I am using asp.net core along with Entity Framework Core. My scenario here is, I want to change the connection string at runtime based on Htt

Answer 1

I have resolved this issue by doing change as Guru Stron's comment and subsequent changes. Here is my change.

Step 1: Changed Autofac Registration class as below:

public class DependencyRegistrar : IDependencyRegistrar
{
    public virtual void Register(ContainerBuilder builder)
    {
        //Removed this code
        //builder.RegisterType(typeof(DbContextOptionsFactory))
        //    .As(typeof(IDbContextOptionsFactory))
        //    .InstancePerRequest();

        //Added this code
        builder.Register(c => c.Resolve<IDbContextOptionsFactory>().Get())
            .InstancePerDependency();  // <-- Changed this line

        builder.RegisterType<AppDbContext>()
            .As(typeof(IDbContext))
            .WithParameter(
                new ResolvedParameter(
                    (pi, cc) => pi.Name == "options",
                    (pi, cc) => cc.Resolve<IDbContextOptionsFactory>().Get()))
            .InstancePerDependency();  // <-- Added this line

        builder.RegisterGeneric(typeof(Repository<>))
            .As(typeof(IRepository<>))
            .InstancePerDependency();  // <-- Changed this line
    }
}

Now, if you getting the error:

InvalidOperationException: No database provider has been configured for this DbContext. A provider can be configured by overriding the DbContext.OnConfiguring method or by using AddDbContext on the application service provider. If AddDbContext is used, then also ensure that your DbContext type accepts a DbContextOptions object in its constructor and passes it to the base constructor for DbContext.

By add below code in AppDbContext class to resolve above error.

Step 2: Modified AppDbContext (Added OnConfiguring() method)

public class AppDbContext : DbContext, IDbContext
{
    public AppDbContext(DbContextOptions<AppDbContext> options)
        : base(options)
    {

    }

    protected override void OnModelCreating(ModelBuilder builder)
    {
        base.OnModelCreating(builder);

        Assembly assemblyWithConfigurations = typeof(IDbContext).Assembly;
        builder.ApplyConfigurationsFromAssembly(assemblyWithConfigurations);
    }

    //Added this method
    protected override void OnConfiguring(DbContextOptionsBuilder dbContextOptionsBuilder)
    {
        base.OnConfiguring(dbContextOptionsBuilder);
    }

    //..
    //..
}