EF基础一
EF基础，从0开始：
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Data.Entity;using System.ComponentModel.DataAnnotations;namespace CodeFirstNewDatabase{ class Program { static void Main(string[] args) { using (var db = new BloggingContext()) { Console.Write("Enter a name for a new Blog: "); var name = Console.ReadLine(); var blog = new Blog { Name = name }; db.Blogs.Add(blog); db.SaveChanges(); var query = from b in db.Blogs orderby b.Name select b; Console.WriteLine("All blogs in the database:"); foreach (var item in query) { Console.WriteLine(item.Name); } Console.WriteLine("Press any key to exit..."); Console.ReadKey(); } } } public class Blog { public int BlogID { get; set; } public string Name { get; set; } public string Url { get; set; } public virtual IList<Post> Posts { get; set; } } public class Post { public int PostID { get; set; } public string Title { get; set; } public string Content { get; set; } public int BlogId { get; set; } public virtual Blog Blog { get; set; } } public class User { [Key] // annotation: keyattribute public string Username { get; set; } public string Displayname { get; set; } } public class BloggingContext : DbContext { public DbSet<Blog> Blogs { get; set; } public DbSet<Post> Posts { get; set; } public DbSet<User> Users { get; set; } protected override void OnModelCreating(DbModelBuilder modelBuilder) // fluent api: override onmodelcreating method { modelBuilder.Entity<User>() .Property(u => u.Displayname) .HasColumnName("Display_name"); } }}