LINQ select distinct c#

Question

I\'m trying to do a query that does not include repeated IdUser values, ​​but does not work.

this is my linq query:

var         


        

Answer 1

Note: The following can be run in LinqPad (free at http://www.linqpad.net/) - simply set the Language dropdown to "C# Program" and paste the code into the editor window.

You can use "group" to provide your distinct requirement as follows:

void Main()
{
    var db = new DataBase();
    var sql= (from u in db.USER
          join c in db.CONSULT on u.IdUser equals c.IdUser 
          group c by new { c.IdUser, c.DateCreate, c.IdTypeConsult, u.Sex } into gc
          select new UsuersViewModel 
                 {  
                    IdUser = gc.Key.IdUser, 
                    DateCreate=gc.Key.DateCreate, 
                    IdTypeConsult = gc.Key.IdTypeConsult, 
                    Sex=gc.Key.Sex 
                 })
                 .Distinct();
    sql.Dump("SQL Distinct Demo");
}
public class Consultation {
    public int  IdUser {get;set;}
    public DateTime DateCreate {get;set;}
    public int IdTypeConsult {get;set;}
}
public class UsuersViewModel : Consultation {
    public string Sex {get;set;}
}
public class DataBase {
    public IEnumerable CONSULT {
        get { 
            return new List{
                new Consultation { IdUser = 1, DateCreate=DateTime.Today, IdTypeConsult = 2},
                new Consultation { IdUser = 2, DateCreate=DateTime.Today.AddDays(1), IdTypeConsult = 4}
            };
        }}
    public IEnumerable USER {
        get {
            return new List{
                new UsuersViewModel { IdUser = 1, Sex="M"},
                new UsuersViewModel { IdUser = 1, Sex="M"},
                new UsuersViewModel { IdUser = 2, Sex="F"},
                new UsuersViewModel { IdUser = 2, Sex="F"}
            };
        }}
}