SelectorAttribute

This package will allow you to generate an editor for simple values that represent multiple choice lists on your view models

Installation

Available on NuGet as the SelectorAttribute package https://nuget.org/packages/SelectorAttribute/

Install-Package SelectorAttribute 

Usage

Create classes inheriting from SelectorAttributeBase to define the choices for a property of a view model.

Enum Example:

public class ExampleEnumSelectorAttribute : SelectorAttributeBase
{
	public ExampleSelectorAttribute()
	{
		this.BulkSelectionThreshold = 1;  // The editor will change to a dropdown when this limit is exceeded
	}

	public override IEnumerable<SelectListItem> GetItems()
	{
		// You can use the Description attribute on enum items to change the displayed text
		return SelectorHelpers.CreateItemsFromEnum<ExampleChoicesEnum>();
	}
}

Options Loaded from Database:

public class RoleSelectorAttribute : SelectorAttributeBase
    {
        public RoleSelectorAttribute()
        {
            this.BulkSelectionThreshold = 100; 
        }

        public override IEnumerable<SelectListItem> GetItems()
        {
            var options = DependencyResolver.Current.GetService<DBContext>()
                .Roles
                .OrderBy(x => x.AccessLevel)
                .ToList();

            return options.ToSelectList(m => m.Id, m => m.Name);
        }
    }

Annotate properties of your view model with these selectors

public class EditViewModel
{
	[ExampleEnumSelector]
	public ExampleEnum Example { get; set; }
	[RoleSelector]
	public int RoleId { get; set; }            
}

In your view, use Html.EditorFor or EditorForModel to create the selector control.

Credit

This code is based on code by Matt Hidinger as part of his MVC Grab bag project. http://www.matthidinger.com/archive/2012/01/23/adding-rich-selector-support-for-mvc.aspx http://mvcgrabbag.codeplex.com/