[英]Linq type conversion delegate for .First method
下面使用這個方法我怎么能寫出來沒有錯誤
return _session.Query<Data.Model.User>().Select(_userMapper.CreateUser)
.AsQueryable();
但寫這個
return _session.Query<Data.Model.User>().Where(x => x.Username == username)
.First(_userMapper.CreateUser);
產生錯誤。
public User CreateUser(Data.Model.User modelUser)
{
return new User{UserId = modelUser.UserId, Username = modelUser.Username,
Email = modelUser.Email, Firstname = modelUser.Firstname,
Lastname = modelUser.lastname};
}
無論是返回集合還是單個項目,我都希望通過create user方法進行轉換。
您需要在First()
之前調用Select
:
return _session.Query<Data.Model.User>()
.Where(x => x.Username == username)
.Select(_userMapper.CreateUser)
.First();
要么:
return _session.Query<Data.Model.User>()
.Select(_userMapper.CreateUser)
.First(x => x.Username == username);
return _userMapper.CreateUser(_session.Query<Data.Model.User>().First(x => x.Username == username));
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