Question

Hi folks I have the following error on line 11 in this controller code :

    public JsonResult GetChartData_IncidentsBySiteStatus(string SiteTypeId, string searchTextSite, string StartDate, string EndDate)
    {
        if (searchTextSite == null)
            searchTextSite = "";

        DateTime startDate = DateTime.Parse(StartDate);
        DateTime endDate = DateTime.Parse(EndDate);

        var sitesQry = _db.Sites;
        if (SiteTypeId != "-1")
            sitesQry = sitesQry.Where(a => a.SiteTypeId.ToString() == SiteTypeId);

        var qry = from i in _db.Incidents   
                  join s in _db.Sites on i.SiteId equals s.SiteId
                  where s.SiteDescription.Contains(searchTextSite)
                    && (i.Entered >= startDate && i.Entered <= endDate)
                  group s by s.SiteStatus.SiteStatusDescription + "[" + s.SiteTypeId.ToString() + "]"
                      into grp
                      select new
                      {
                          Site = grp.Key,
                          Count = grp.Count()
                      };

        return Json(qry.ToList()  , JsonRequestBehavior.AllowGet);
    }

………..the error is:

Error 7 Cannot implicitly convert type
‘System.Linq.IQueryable’ to
‘System.Data.Linq.Table’. An explicit conversion
exists (are you missing a cast?) C:\Documents and
Settings\Administrator\Desktop\IRenewables_EMAS\IRenewables_EMAS\Controllers\IncidentController.cs 69 28 Emas.Web

Can anyone suggest a workaround for this?

thanks

Answer 1

You are trying to assign a base class instance to a sub class instance.

Instead of

var sitesQry = _db.Sites;

try using

IQueryable<Site> sitesQry = _db.Sites;