What methods are used to import data into Entity Framework Core?

In Entity Framework Core, data import can be performed in several ways:

1. Through the database context (DbContext)
   • Create entity objects and add them to the context using Add or AddRange.
   • Then call SaveChanges() to save to the database.

using (var context = new AppDbContext())
{
    var newEntity = new Product { Name = "Product1", Price = 100 };
    context.Products.Add(newEntity);
    context.SaveChanges();
}

2. Using bulk operations via third-party libraries

   • For large volumes of data, libraries like EFCore.BulkExtensions can be used to quickly import data in batches.

3. Import from external sources

   • Data is first loaded from CSV, JSON, Excel, etc., into C# objects.
   • These objects are then added to the context and saved.

4. Using migrations and seeding

   • For initial data import, the HasData method can be used in the model configuration.

Thus, the choice of method depends on the volume of data and the source of import.