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 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 Blogs { get; set; }

public DbSet Posts { get; set; }

public DbSet Users { get; set; }

protected override void OnModelCreating(DbModelBuilder modelBuilder) // fluent api: override onmodelcreating method

{

modelBuilder.Entity()

.Property(u => u.Displayname)

.HasColumnName("Display_name");

}

}

}

作者：incognito007 发表于2013-3-14 10:09:35 原文链接

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