Paginated List (Helpers) error

Mr. Bill · December 20th, 2010, 04:37 AM

Code:

Inherits="System.Web.Mvc.ViewPage<NerdDinner.Helpers.PaginatedList<NerdDinner.Models.Dinner>>"

...returns the following error for me.
The type or namespace name 'Helpers' does not exist in the namespace 'NerdDinner' (are you missing an assembly reference?)

also the "foreach" in the following statement:

Code:

<% foreach (var dinner in Model) { %>

returns the following error:
foreach statement cannot operate on variables of type 'NerdDinner.Helpers.PaginatedList<NerdDinner.Model s.Dinner>' because 'NerdDinner.Helpers.PaginatedList<NerdDinner.Model s.Dinner>' does not contain a public definition for 'GetEnumerator'

When I got to the section in the book on Paginated List's (p103-108), the book mentioned 'Helper' but gives absolutely no background on what it is. I've searched and searched looking through the book and online, tried countless fixes and I can't seem to figure out why when I click on the "Find Dinner" link on my NerdDinner application I'm receiving the above noted errors.

Mr. Bill · December 21st, 2010, 03:48 AM

in the following 'Inherits'

Code:

Inherits="System.Web.Mvc.ViewPage<NerdDinner.Helpers.PaginatedList<NerdDinner.Models.Dinner>>"

"NerdDinner.Helper..." is the name of the site/project/solution.

"NerdDinner.Helpers.Paginat..." is a folder in the solution.

"...Helpers.PaginatedList" is a .cs 'class' in the folder.

What is the correct way to use Paginated Lists as shown in the first section of the book. Please help.

flyinhawaiian · December 21st, 2010, 04:00 AM

Can you post the code for the Dinner model? Check to see if properties are public.

Mr. Bill · December 21st, 2010, 04:04 AM

Code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.ComponentModel.DataAnnotations;

namespace NerdDinner.Models
{
    [Bind(Include="Title,Description,EventDate,Address,Country,ContactPhone,Latitude,Longitude")]
    [MetadataType(typeof(Dinner_Validation))]
    public partial class Dinner
    {
        //...
    }
    public class Dinner_Validation
    {
        [Required(ErrorMessage = "Title is required")]
        [StringLength(50, ErrorMessage = "Title may not be longer than 50 characters")]
        public string Title { get; set; }

        [Required(ErrorMessage = "Description is required")]
        [StringLength(265, ErrorMessage = "Description must be 256 characters or less")]
        public string Description { get; set; }

        [Required(ErrorMessage = "Address is required")]
        public string Address { get; set; }

        [Required(ErrorMessage = "Country is required")]
        public string Country { get; set; }

        [Required(ErrorMessage = "Phone# is required")]
        public string ContactPhone { get; set; }
    }
}

Mr. Bill · December 21st, 2010, 06:31 AM

System.Web.Mvc.ViewPage<NerdDinner.Models.PaginatedList<NerdDinner.Models.Dinner>>

caof2005 · February 1st, 2011, 01:13 AM

Quote:

Originally Posted by Mr. Bill

in the following 'Inherits'

Code:

Inherits="System.Web.Mvc.ViewPage<NerdDinner.Helpers.PaginatedList<NerdDinner.Models.Dinner>>"

"NerdDinner.Helper..." is the name of the site/project/solution.

"NerdDinner.Helpers.Paginat..." is a folder in the solution.

"...Helpers.PaginatedList" is a .cs 'class' in the folder.

What is the correct way to use Paginated Lists as shown in the first section of the book. Please help.

Bill...
I have a problem within thew same chunk of code.
I have tried several ways, and although my solution compiles perfectly, when I invoke the index action method by sending a GET request in the browser (http://localhost:1799/Dinners) I get a " Server Error in '/' Application. ".

The way I see (and try to deduce) the code is:

"Helpers" is a namespace within the "NerdDinner" namespace.
So I created the "Helpers" namespace and I created the PaginatedList class within PaginatedList.cs file inside the Helpers namespace:

namespace NerdDinner.Helpers
{
public class PaginatedList<T> : List<T>
{
//--- Propiedades ---//
public int PageIndex { get; private set; }
public int PageSize { get; private set; }
public int TotalCount { get; private set; }
public int TotalPages { get; private set; }

public bool HasPreviousPage
{
get
{
return ( PageIndex > 0 );
}
}

public bool HasNextPage
{
get
{
return ( PageIndex + 1 < TotalPages );
}
}

//--- Methods ---//

public PaginatedList(IQueryable<T> fuente,
int indicePagina,
int tamanoPagina)
{
PageIndex = indicePagina;
PageSize = tamanoPagina;

//--- Query 1 ---//
TotalCount = fuente.Count( );

TotalPages = (int)Math.Ceiling( TotalCount / (double)PageSize );

//--- Query 2 ---//
this.AddRange( fuente.Skip( PageIndex * PageSize ).Take( PageSize ) );
}

}
}

Now it is up to you to create a folder called Helpers and include the Helpers namespace inside that folder.

Hope it helps in someway.
Carlos

Mr. Bill · March 4th, 2011, 06:25 AM

December 20th, 2010, 04:37 AM
↑ date thread created.

↓ date of you're response.
Good Ol' February 1st, 2011, 01:13 AM