Question : Writing elegant LINQ queries using lamda expressions

Can someone help me out in writing this query using a more elegant approach? Although this query works, I would like to neaten/shorten it - using Lamda expressions if possible, except my Lamda knowledge is a little limited.

I am using Sitefinity to develop this application, and this query involves some custom tables and 2 Sitefinity built-in tables.

         
           
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          public static IQueryable GetUserDetailsById(Guid userID)
        {
            //Create an instance of the TicketRequestDataContext object.
            TicketRequestDataContext db = new TicketRequestDataContext();

            IQueryable userDetails = from u in db.telerik_UserMetaInfos
                                     where u.UserId == userID
                                     select new
                                     {
                                         FirstName = (from f in db.telerik_UserMetaInfos
                                                      where f.PropertyName == "FirstName"
                                                      select f.Text),
                                         LastName = (from l in db.telerik_UserMetaInfos
                                                     where l.PropertyName == "LastName"
                                                     select l.Text),
                                         Email = (from e in db.telerik_Users
                                                  where e.UserId == userID
                                                  select e.Email).Single(),
                                         JobTitle = (from j in db.telerik_UserMetaInfos
                                                     where j.PropertyName == "JobTitle"
                                                     select j.Text),
                                         DirectPhone = (from d in db.telerik_UserMetaInfos
                                                        where d.PropertyName == "DirectPhone"
                                                        select d.Text),
                                         MobilePhone = (from m in db.telerik_UserMetaInfos
                                                        where m.PropertyName == "MobilePhone"
                                                        select m.Text),
                                         FaxNumber = (from f in db.telerik_UserMetaInfos
                                                      where f.PropertyName == "FaxNumber"
                                                      select f.Text),
                                         Address1 = (from a in db.telerik_UserMetaInfos
                                                     where a.PropertyName == "Address1"
                                                     select a.Text),
                                         Address2 = (from a in db.telerik_UserMetaInfos
                                                     where a.PropertyName == "Address2"
                                                     select a.Text),
                                         City = (from c in db.telerik_UserMetaInfos
                                                 where c.PropertyName == "City"
                                                 select c.Text),
                                         Country = (from c in db.telerik_UserMetaInfos
                                                    where c.PropertyName == "Country"
                                                    select c.Text),
                                         Postcode = (from c in db.telerik_UserMetaInfos
                                                     where c.PropertyName == "Postcode"
                                                     select c.Text),

                                     };

            return userDetails;
        }

           
         

Attachments:

TicketRequestDataContext.PNG (65 KB) (File Type Details)

Ticket Request Data Context

telerik-UserMetaInfo.PNG (67 KB) (File Type Details)

telerik_UserMetaInfo

Answer : Writing elegant LINQ queries using lamda expressions

Hi markerasmus;

See if this fits your needs.

Fernando

                       
         
           
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             public static IQueryable GetUserDetailsById(Guid userID)
{
    //Create an instance of the TicketRequestDataContext object.
    TicketRequestDataContext db = new TicketRequestDataContext();

    IQueryable userDetails = (from u in db.telerik_UserMetaInfos
                              where u.UserId == userID
                              group u by u.UserId into ug
                              select new
                              {
                                  FirstName = ug.Where( fn => fn.PropertyName == "FirstName").Select( fn = fn.Text).First(),
                                  LastName = ug.Where( ln => ln.PropertyName == "LastName").Select( ln = ln.Text).First(),
                                  Email = db.telerik_Users.Where( u => u.UserId == userID).Select( u = u.Email).First(),
                                  JobTitle = ug.Where( j => j.PropertyName == "JobTitle").Select( j = j.Text).First(),
                                  DirectPhone = ug.Where( d => d.PropertyName == "DirectPhone").Select( d = d.Text).First(),
                                  MobilePhone = ug.Where( m => m.PropertyName == "MobilePhone").Select( m = m.Text).First(),
                                  FaxNumber = ug.Where( f => f.PropertyName == "FaxNumber").Select( f = f.Text).First(),
                                  Address1 = ug.Where( a => a.PropertyName == "Address1").Select( a = a.Text).First(),
                                  Address2 = ug.Where( a => a.PropertyName == "Address2").Select( a = a.Text).First(),
                                  City = ug.Where( c => c.PropertyName == "City").Select( c = c.Text).First(),
                                  Country = ug.Where( c => c.PropertyName == "Country").Select( c = c.Text).First(),
                                  Postcode = ug.Where( c => c.PropertyName == "Postcode").Select( c = c.Text).First()
                              }).FirstOrDefault();

    return userDetails;
}
           
         