“对象”不包含“类型”的定义

Question

Im gettin this error but i dont know what it is. I've looked for the answer but none can answer main or maybe im just missing something. Here my code:

Connection db = new Connection();

        public ActionResult Index()
        {

            ViewBag.query = from input in db.field
                            where input.ID_FIELD == 1
                            select new {
                                type = input.FIELD_TYPE 
                            };


            return View();
        }

and the view side

 @foreach (var item in ViewBag.query)
        { 
                @item.type//error here: 'object' does not contain a definition for 'type', why???
        }

And if i make a simple select with where clause, work ok public ActionResult Index() {

            ViewBag.query = from input in db.field
                            where input.ID_FIELD == 1
                            select input.FIELD_TYPE;


            return View();
        }

What could be my problem? I've seem many toturials doing the same and works great like this one i did just now: int[] number = { 1, 2, 3, 4, 5 };

            var query = from num in number
                        let x = num + num + num
                        select new {avg = x};

               foreach (var item in query)
            {
                Console.WriteLine(item.avg);

            }

Everything is ok here. Why could be the problem??

Answer 1

You can't return an anonymous type from a method. Instead, create a new type and return that type.

For example:

ViewBag.query = from input in db.field
                            where input.ID_FIELD == 1
                            select new MyType() {
                                someField = input.FIELD_TYPE 
                            };

public class MyType
{
  public int someField {get;set;}//compatible with whatever type FIELD_TYPE is.
}

Answer 2

In your Last Example you are Not using 'item.type'. Apart from that, System.Object does Not contain a property 'type'. You can use 'GetType()', though.
See here for reference.

Answer 3

The problem is that ViewBag is dynamic , but the anonymous object you're storing in it is not, so the compiler cannot access its properties directly. You could just store a collection of values in the ViewBag property rather then the whole query:

Connection db = new Connection();
public ActionResult Index()
{

    ViewBag.types = from input in db.field
                    where input.ID_FIELD == 1
                    select input.FIELD_TYPE;

    return View();
}

and then

@foreach (var type in ViewBag.types)
{ 
    @type
}