动态加载 DbSet 到 DbContext

Question

How do I dynamically load into an EF7 DbContext a X number of classes without explicitly writing them in a DbContext class ?

For example, I tried to avoid it like this:

public class MyDbContextClass : DbContext
{
    public DbSet<Category> categories {get;set;}
    public DbSet<Product> products {get;set;}
    ...
}

So it could be great to load Category and Product dynamically (without knowing if I have 2 or 20 classes).

Is it possible?

Answer 1

dbContext.Set<T>() creates an instance of DbSet<T> as long as T is a type in your model (ie you have to add the entity type in OnModelCreating ).

See the source code for .Set<T> .

Answer 2

You should use this method:

• All entities must inherit from BaseType...

   public static void RegisterAllEntities<BaseType>(this ModelBuilder modelBuilder, params Assembly[] assemblies) { var types = assemblies.SelectMany(a => a.GetExportedTypes()) .Where(c => c.IsClass && !c.IsAbstract && c.IsPublic && typeof(BaseType).IsAssignableFrom(c)); foreach (var type in types) modelBuilder.Entity(type); }