Class cl = new Class() {   ClassName = "一年级1班" };                               TestDBEntities context = new TestDBEntities();                context.Class.Add(cl);                                Student st = new Student() { Class = cl,  Name="wangxiaoming" };                context.Student.Add(st);                context.SaveChanges();

下面给出数据库关系图

对应sql脚本：

CREATE TABLE [dbo].[Class]([ClassID] [int] IDENTITY(1,1) NOT NULL,[ClassName] [nvarchar](50) NOT NULL,CONSTRAINT [PK_Class] PRIMARY KEY CLUSTERED ([ClassID] ASC)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]) ON [PRIMARY]

 

CREATE TABLE [dbo].[Student](    [StudentID] [int] IDENTITY(1,1) NOT NULL,    [Name] [nvarchar](50) NOT NULL,    [ClassID] [int] NOT NULL, CONSTRAINT [PK_Student] PRIMARY KEY CLUSTERED (    [StudentID] ASC)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]) ON [PRIMARY]

设置class和student的主键和student的外键，并且主键为自增。