passing value to list

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Unable to cast object of type 'System.Data.Objects.ObjectQuery`1[<>f__AnonymousType 5`2[System.String,System.String]]' to type 'System.Collections.Generic.List`

model :

CSS

public class UserProductProperty
   {

       public global::System.String PName
       {
           get
         ;
           set
          ;
       }
       public global::System.String PValue
       {
           get
          ;
           set
           ;
       }
   }
   public class UserWishListDetailModel
   {
       public global::System.String ImagePath
       {
           get
         ;
           set
          ;
       }
       public global::System.String Code
       {
           get
         ;
           set
          ;
       }

       public List<UserProductProperty> ProductPropertyList { get; set; }
   }

controller :

C#

UserWishListDetailModel model = new UserWishListDetailModel();
            var Wishproduct = (from p in db.Products where p.ProductId == ProductId select p).Single();

            model.ImagePath = Wishproduct.ImagePath;
            model.Code = Wishproduct.Code;
            model.ProductPropertyList = (List<UserProductProperty>)from prop in db.ProductSelectedPropertyValues
                                                                   where prop.ProductId == ProductId
                                                                   select
                                                                  new
                                                                  {
                                                                      PName = prop.ProductPropertyValue.ProductProperty.Name,
                                                                      PValue = prop.ProductPropertyValue.Value
                                                                  };
            return View(model);

Posted 13-Apr-14 20:38pm

Akram khan asp.net

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Fredrik Bornander · Answer 1 · 2014-04-13T21:16:00

You're casting the result of the query to a list of UserProductPropertys, and that's not going to work because of two reasons;

1. The results of the query are of an anonymous type;
Selecting like this;

C#

select new
{
  PName = prop.ProductPropertyValue.ProductProperty.Name,
  PValue = prop.ProductPropertyValue.Value
};

Will not create a UserProductProperty instance, but an instance of a new anonymous type.

2. The result might not be a List at all, all Linq is promising is that it is IEnumerable, but you can create a List from the IEnumerable.

Try changing you assignment to model.ProductPropertyList to this:

C#

model.ProductPropertyList = (from prop in db.ProductSelectedPropertyValues
                             where prop.ProductId == ProductId
                             select
                             new UserProductProperty
                             {
                               PName = prop.ProductPropertyValue.ProductProperty.Name,
                               PValue = prop.ProductPropertyValue.Value
                             }).ToList();

The call to ToList will create a List and selecting new UserProductProperty will make sure you get the type you want.

Hope this helps,
Fredrik