实体框架优先代码不会创建数据库

Question

I am trying to use code-first in Entity Framework to generate the database, but it's not working. Here's my connection string in the app.config of the console application:

<add name="BlogDbContext" 
     connectionString="data source=myserver; initial catalog=CodeFirstDemo; integrated security=SSPI" 
     providerName="System.Data.SqlClient" />

and here's my program.cs file code:

using System.Data.Entity;

namespace CodeFirstDemo
{
    public class Post
    {
        public int PostId { get; set; }
        public System.DateTime DatePublished { get; set; }
        public string Title { get; set; }
        public string Body { get; set; }
    }

    public class BlogDbContext : DbContext
    {
        public DbSet<Post> Posts { get; set; }
    }

    class Program
    {
        static void Main(string[] args)
        {
        }
    }
}

In package manager console I tried: enable-migration , then add-migration , then update-database .. but nothing happened.

I tried connection string as suggested in other questions like this:

<add name="CodeFirstDemo.BlogDbContext" 
     connectionString="data source=myserver; initial catalog=CodeFirstDemo; integrated security=SSPI" 
     providerName="System.Data.SqlClient" />

Any ideas?

Answer 1

Add an empty constructor with the following signature to reference the connection string you already added to your app.config:

  public BlogDbContext()
        : base("Name=BlogDbContext")
  {
  }

You don't need to use migration to create your database.You can do what I show below in your Main method:

using (var context = new BlogDbContext())
{
    context.Database.CreateIfNotExists();
}

Answer 2

Since you are using code-first you should have these codes that look alike to the following example :

protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Entity<Post>().ToTable("Post");
            base.OnModelCreating(modelBuilder);
    }

These will create the database table of your entities.