Question

In MVC 3 I need to bind a DropDownList to a Tuple… I receive the following error:

Could you tell what I’m doing wrong here? thanks

Error

DataBinding: 'System.Tuple`2[[System.Int32, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]' does not contain a property with the name 'Value'.

IN RAZOR

@Html.DropDownListFor(
    x => x.RemindersList,
    new SelectList(Model.RemindersList, "Value", "Text")
)

Class (instance passed to ViewModel)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace AshtonEventsMobile
{
    public class Reminders
    {
        public List<Tuple<int, string>> TimeSpanText { get; set; }


        // We are setting the default values using the Costructor
        public Reminders()
        {
            List<Tuple<int, string>> timeSpanText = new List<Tuple<int, string>>();

            Tuple<int, string> reminder0 = new Tuple<int, string>(0, "None");
            timeSpanText.Add(reminder0);

            Tuple<int, string> reminder1 = new Tuple<int, string>(300, "5 minutes before");
            timeSpanText.Add(reminder1);

            Tuple<int, string> reminder2 = new Tuple<int, string>(900, "15 minutes before");
            timeSpanText.Add(reminder2);

            Tuple<int, string> reminder3 = new Tuple<int, string>(1800, "30 minutes before");
            timeSpanText.Add(reminder3);

            Tuple<int, string> reminder4 = new Tuple<int, string>(3600, "1 hour before");
            timeSpanText.Add(reminder4);

            Tuple<int, string> reminder5 = new Tuple<int, string>(7200, "2 hours before");
            timeSpanText.Add(reminder5);

            Tuple<int, string> reminder6 = new Tuple<int, string>(86400, "1 day before");
            timeSpanText.Add(reminder6);

            Tuple<int, string> reminder7 = new Tuple<int, string>(172800, "2 day before");
            timeSpanText.Add(reminder7);

            TimeSpanText = timeSpanText;
        }

    }
}

Answer 1

The error sums it up – it does indeed not have a property named Value. A tuple of type Tuple<T1, T2> have the properties Item1 and Item2 – more info on MSDN can be found here.