Question
I have recently been running through the Dapper extension library for my API. the following code returns a list of users with their resptive addresses based on a single user id:
public User GetUserBicProfiles(string userId)
{
using (
var multipleResults = this.db.QueryMultiple("sp_UserPermisisons", new {userId =
userId},commandType: CommandType.StoredProcedure))
{
var user = multipleResults.Read<User>().SingleOrDefault();
var permissions= multipleResults.Read<Permissions>().ToList();
if (user != null&& permissions != null)
{
user.Permissions.AddRange(permissions);
}
return user;
}
}
this works perfectly, but when I try and use the same set of details, but without the userId as the parameter (should return all users with their respective permissions), I get an error relating to adding the range.
System.Collections.Generic.List' does not contain a definition for 'UserPermissions' and no extension method 'UserPermissions' accepting a first argument of type 'System.Collections.Generic.List' could be found (are you missing a using directive or an assembly reference?)
The method to return all is:
public List<User> GetUsers()
{
using (var multipleResults = this.db.QueryMultiple("sp_UserPermissions",commandType: CommandType.StoredProcedure))
{
var user = multipleResults.Read<User>().ToList();
var permissions = multipleResults.Read<Permissions>().ToList();
if (user != null && permissions != null)
{
user.Permissions.AddRange(permissions);
}
return user;
}
}
the User class is:
public class User
{
public User()
{
this.Permissions = new List<Permissions>();
}
public string UserId { get; set; }
public string UserName { get; set; }
public string ApplicationName { get; set; }
public string Email { get; set; }
public string Comment { get; set; }
public string Password { get; set; }
public string PasswordQuestion { get; set; }
public string PasswordAnswer { get; set; }
public bool? IsApproved { get; set; }
public DateTime LastActivityDate { get; set; }
public DateTime LastLoginDate { get; set; }
public DateTime LastPasswordChangeDate { get; set; }
public DateTime CreationDate { get; set; }
public bool? IsOnline { get; set; }
public bool? IsLockedOut { get; set; }
public DateTime LastLockedOutDate { get; set; }
public bool? FailedPasswordAttempCount { get; set; }
public DateTime FailedPasswordAttemptWithStart { get; set; }
public bool? FailedPasswordAnswerAttemptCount { get; set; }
public DateTime FailedPasswordAnsdwerAttemptWindowStart { get; set; }
public List<Permissions> Permissions { get; set; }
}
Accepted Answer
The error is because you're trying to access the Permissions object on a List<User> object, which does not exist either as property or as an extensions method.
In your first example, the variable user is of type User, you return a single User object by using the SingleOrDefault() method.
...
var user = multipleResults.Read<User>().SingleOrDefault();
var permissions= multipleResults.Read<Permissions>().ToList();
if (user != null&& permissions != null)
{
user.Permissions.AddRange(permissions);
}
return user; // --> user type is User
...
While in your second example, the variable user is of type List<User>, you return a list of User object (List<User>) using the ToList() method.
...
var user = multipleResults.Read<User>().ToList();
var permissions = multipleResults.Read<Permissions>().ToList();
if (user != null && permissions != null)
{
user.Permissions.AddRange(permissions);
}
return user; // --> user type is List<User>
...