//想想18，也按这种思路改一改先标注newUserExpand.User删除再标注newUserExpand删除
//也可以达到预期
public void Method20()
{
//准备一条数据
using (var context = new DefaultDbContext())
{
var user = new SysUser()
{
UserName = "******",
Password = "******",
UserExpand = new SysUserExpand
{
ExpandValue1 = "user20的补充"
}
};
context.Entry(user).State = System.Data.Entity.EntityState.Added;
context.SaveChanges();
}
SysUserExpand newUserExpand = null;
using (var context = new DefaultDbContext())
{
newUserExpand = context.Set <SysUserExpand>().Include(p => p.User)
.SingleOrDefault(o => o.ExpandValue1 == "user20的补充");
}
using (var context = new DefaultDbContext())
{
context.Entry(newUserExpand.User).State = System.Data.Entity.EntityState.Deleted;
context.Entry(newUserExpand).State = System.Data.Entity.EntityState.Deleted;
context.SaveChanges();
}
}
//一步新增，通过UserExpand仓储
public void Method101()
{
var repo = new UserExpandRepository();
var userExpand = new SysUserExpand()
{
ExpandValue1 = "user101的补充",
User = new SysUser()
{
UserName = "******",
Password = "******"
}
};
repo.Insert(userExpand);
}
//1、2都是一次定义包含两个对象，也可以两步定义
public void Method3()
{
using (var context = new DefaultDbContext())
{
var user = new SysUser()
{
UserName = "******",
Password = "******",
};
var userExpand = new SysUserExpand()
{
ExpandValue1 = "user3的补充"
};
user.UserExpand = userExpand;
context.Entry(user).State = System.Data.Entity.EntityState.Added;
context.SaveChanges();
}
}
//通过新增UserExpand对象，然后设置UserExpand新增
//不报错，但是达不到预期效果，同时新增了新的User和新的UserExpand
//注意：这里新增UserExpand是包含id和导航User的
public void Method5()
{
//准备一条数据
using (var context = new DefaultDbContext())
{
var user = new SysUser()
{
UserName = "******",
Password = "******",
};
context.Entry(user).State = System.Data.Entity.EntityState.Added;
context.SaveChanges();
}
SysUser newUser = null;
using (var context = new DefaultDbContext())
{
newUser = context.Set <SysUser>().SingleOrDefault(o => o.UserName == "user5");
}
SysUserExpand newUserExpand = new SysUserExpand
{
Id = newUser.Id,
User = newUser,
ExpandValue1 = "user5的补充"
};
newUser.UserExpand = newUserExpand;
using (var context = new DefaultDbContext())
{
context.Entry(newUserExpand).State = System.Data.Entity.EntityState.Added;
context.SaveChanges();
}
}
