Entity Framework Core database

Question

I thought that I would learn to use ASP.NET Core, instead of what I am used to, ASP.NET, because Microsoft won't update ASP.NET anymore.

But I already got problems...

My problem is that I want to connect to my localdb file, and make this code-first table, but I get an error

No database provider has been configured for this DbContext.

even though I have a connection string for it:

"ConnectionStrings": {
    "DefaultConnection": "Server=(localdb)\\mssqllocaldb;Database=api;Trusted_Connection=True;"
  },

And I do include it in the startup, that it should use that connection string:

services.AddDbContext<UserContext>(options =>
            options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));

My table class is like this:

public class User
{
    public int UserId { get; set; }
    public string UserName { get; set; }
    public string Name { get; set; }
    public int age { get; set; }
}

And here is my Context:

public class UserContext : DbContext
{
    public DbSet<User> Users { get; set; }
}

I found out! You can use EF 6.3 and newer, instead of core, because they are crossplatform now. — Mikkel Gundersen
– Mikkel Gundersen, Commented Nov 20, 2020 at 17:27

farshid jahanmanesh · Accepted Answer · 2020-11-20 18:08:33Z

1

your UserContext should have public constructor which accepts a DbContextOptions and pass it to the base constructor .

answered Nov 20, 2020 at 18:08

farshid jahanmanesh

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