MVC Razor - Enum Drop List

To Bind Enum value in Drop Down use the following

CSHTML

To display list of enum and select the value

@Html.EnumDropDownList(model => model.State, new { Id = "ddlState" })

To display list of enum item and keep binding when save/modify

@Html.EnumDropDownListFor(model => model.StateSelected, Model.State, new { Id = "ddlState" })

Note: model.StateSelected is int value.

Model

private int _StateSelected = 1;

public int StateSelected

{

  get { return _StateSelected; }

  set { _StateSelected = value; }

}

private State _State = 1;

public State State 

{

  get { return _State; }

  set { _State= value; }

}

Note: State is enum

public enum State

        {

            Tamilnadu =1,

            Karnadaka,

            ..

       

        }

Helper Class

  /// <summary>

        /// Enums the drop down list for.

        /// </summary>

        /// <typeparam name="TModel">The type of the model.</typeparam>

        /// <typeparam name="TEnum">The type of the enum.</typeparam>

        /// <param name="htmlHelper">The HTML helper.</param>

        /// <param name="expression">The expression.</param>

        /// <param name="htmlAttributes">The HTML attributes.</param>

        /// <returns></returns>

        public static MvcHtmlString EnumDropDownList<TModel, TEnum>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TEnum>> expression, object htmlAttributes = null)

        {

            ModelMetadata metadata = ModelMetadata.FromLambdaExpression(expression, htmlHelper.ViewData);

            Type enumType = GetNonNullableModelType(metadata);

            Type baseEnumType = Enum.GetUnderlyingType(enumType);

            IEnumerable<SelectListItem> items = from value in enumType.GetFields(BindingFlags.Static | BindingFlags.GetField | BindingFlags.Public)

                                                select new SelectListItem()

                                                {

                                                    Text = GetEnumDisplayValue(value),

                                                    Value = Convert.ChangeType(value.GetValue(null), baseEnumType).ToString(),

                                                    Selected = (value.GetValue(null).Equals(metadata.Model))

                                                };

            return SelectExtensions.DropDownList(htmlHelper, "EnumDropDown", items, htmlAttributes);

        }

        /// <summary>

        /// Enums the drop down list for.

        /// </summary>

        /// <typeparam name="TModel">The type of the model.</typeparam>

        /// <typeparam name="TEnum">The type of the enum.</typeparam>

        /// <typeparam name="TProperty">The type of the property.</typeparam>

        /// <param name="htmlHelper">The HTML helper.</param>

        /// <param name="expression">The expression.</param>

        /// <param name="enumType">Type of the enum.</param>

        /// <param name="htmlAttributes">The HTML attributes.</param>

        /// <returns></returns>

        public static MvcHtmlString EnumDropDownListFor<TModel, TEnum, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TEnum>> expression, TProperty enumType, object htmlAttributes = null)

        {

            ModelMetadata metadata = ModelMetadata.FromLambdaExpression(expression, htmlHelper.ViewData);

            Type baseEnumType = Enum.GetUnderlyingType(typeof(TProperty));

            IEnumerable<SelectListItem> items = from value in typeof(TProperty).GetFields(BindingFlags.Static | BindingFlags.GetField | BindingFlags.Public)

                                                select new SelectListItem()

                                                {

                                                    Text = GetEnumDisplayValue(value),

                                                    Value = Convert.ChangeType(value.GetValue(null), baseEnumType).ToString(),

                                                    Selected = (value.GetValue(null).Equals(metadata.Model))

                                                };

            return SelectExtensions.DropDownListFor(htmlHelper, expression, items, htmlAttributes);

        }

        /// Gets the enum display value.

        /// </summary>

        /// <param name="field">The field.</param>

        /// <returns></returns>

        private static string GetEnumDisplayValue(FieldInfo field)

        {

            string text;

            DescriptionAttribute[] attributes =

           (DescriptionAttribute[])field.GetCustomAttributes(

           typeof(DescriptionAttribute),

           false);

            if (attributes != null &&

                attributes.Length > 0)

            {

                text = attributes[0].Description;

            }

            else

            {

                text = field.Name;

            }

            return text;

        }

        /// <summary>

        /// Gets the type of the non nullable model.

        /// </summary>

        /// <param name="modelMetadata">The model metadata.</param>

        /// <returns></returns>

        private static Type GetNonNullableModelType(ModelMetadata modelMetadata)

        {

            Type realModelType = modelMetadata.ModelType;

            Type underlyingType = Nullable.GetUnderlyingType(realModelType);

            if (underlyingType != null)

            {

                realModelType = underlyingType;

            }

            return realModelType;

        }