ASP.NET Core：在使用自定义 DbContext 的同时也使用 Identity 时出错

Question

I've created a dbContext based on an existing Azure SQL Database using Entity Framework. I added this database to my app's services as follows:

        public void ConfigureServices(IServiceCollection services)
    {
        //Identity Database Context
        services.AddDbContext<IdentityDbContext>(options =>
            options.UseSqlServer(Configuration.GetConnectionString("DataDb"),
            optionsBuilders =>
            optionsBuilders.MigrationsAssembly("WebPortal"))
        );

        services.AddIdentity<IdentityUser, IdentityRole>()
            .AddEntityFrameworkStores<IdentityDbContext>()
            .AddDefaultTokenProviders();

        //Custom Database Context
        services.AddDbContext<CustomDbContext>(options =>
            options.UseSqlServer(Configuration.GetConnectionString("CustomDb"))
        );

        services.AddMvc();

    }

When I try to run this I get the following error message:

InvalidOperationException: The DbContextOptions passed to the IdentityDbContext constructor must be a DbContextOptions. When registering multiple DbContext types make sure that the constructor for each context type has a DbContextOptions parameter rather than a non-generic DbContextOptions parameter.

The constructor for my custom Context does have a parameter:

    public CustomDbContext(DbContextOptions<CustomDbContext> options)
        : base(options)
    {
    }

Why am I getting the error?

Answer 1

I had the same problem. my scenario was that, i needed two Context ReadDataContext and WriteDataContext ,i solved that exception with bottom Contexts

public class ReadOnlyDataContext : DbContext
{
    public ReadOnlyDataContext(DbContextOptions options) : base(options)
    {
    }
    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.RemovePluralizingTableNameConvention();
        Assembly assemblyWithConfigurations = typeof(TaskConfiguration).Assembly;
        modelBuilder.ApplyConfigurationsFromAssembly(assemblyWithConfigurations);
    }
}

Pay attention to the DataContext Constructor

 public class WriteDataContext : DbContext, IContext
{
    public WriteDataContext(DbContextOptions<WriteDataContext> options)
        : base(options)
    {
    }
    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.RemovePluralizingTableNameConvention();
        Assembly assemblyWithConfigurations = typeof(TaskConfiguration).Assembly;
        modelBuilder.ApplyConfigurationsFromAssembly(assemblyWithConfigurations);
    }
}

And for registeration

 services.AddDbContext<DataContext>(opt =>
        {
            opt.UseSqlServer(configuration.GetConnectionString("CommanderConnection"));
            opt.LogTo(Console.WriteLine).EnableSensitiveDataLogging();
        });
 services.AddDbContext<ReadOnlyDataContext>(opt =>
        {
            opt.UseSqlServer(configuration.GetConnectionString("CommanderConnection"));
            opt.LogTo(Console.WriteLine).EnableSensitiveDataLogging();
        });