#constraints
为IdentityUser添加外键，创建用户时提示主表外键冲突？
var dep = _departmentRepository.Departments.FirstOrDefault(d => d.DepartmentId == Id);
user.Department = dep;
var result = await userManager.CreateAsync(user, model.Password);
虽然从主表Departments中找到了实例并赋值给了user的Department属性，但是CreateAsync的时候仍然要在主表Departments中添加此Department实例，怎么解决？急！
... 展开详请
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