c# - 从数据库中检索用户并转换为用户对象

Question

我正在尝试这样做：

User user = (User)db.Users.Include("Sports").Where(a => a.UserId == currentUser.UserId);

但是我遇到了演员错误。

如何从数据库中检索用户并转换为用户对象？

解决方案：

User user = db.Users.Include("Sports").Where(a => a.UserId == currentUser.UserId).FirstOrDefault();   

或者

User user = db.Users.Include("Sports").SingleOrDefault(a => a.UserId == currentUser.UserId);            

Answer 1

您不需要显式转换。

User user = db.Users.Include("Sports").
              Where(a => a.UserId == currentUser.UserId).FirstOrDefault();

这应该可行， AsssumungUsers是 Type 的属性DbSet<User>。

Answer 2

你可以试试

 User user = (from U in db.Users.Include("Sports") where U.UserID == currentUser.UserID select U).FirstOrDefault()

Answer 3

我会尝试

     var user = (from U in db.Users.Include("Sports") 
where U.UserID == currentUser.UserID select U).Single();

因为应该只有一个匹配的用户 ID。

Answer 4

var user = db.Users.Find(currentUser.UserId);

db.Entry(user).Reference("Sports").Load();