Create a drop -down list from an enumeration in ASP.NET MVC

Html.DropDownList expansion method in ASP.NET MVC provides a way to facilitate creating a drop -down list. However, using it with enumeration may be tricky.

MVC 5.1 and above versions: Use `Html.EnumDropDownListFor`

MVC 5.1 introduced the Html.EnumDropDownListFor extension method, simplifying the process of creating a drop -down list from enumeration. Examples as follows:

@Html.EnumDropDownListFor(
    x => x.YourEnumField,
    "请选择类型", 
    new { @class = "form-control" })

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MVC version 5: Use

`EnumHelper`

If you are using MVC 5, you can use the

category: Microsoft.Web.Mvc.dll in the EnumHelper program concentration

@Html.DropDownList("MyType", 
   EnumHelper.GetSelectList(typeof(MyType)) , 
   "请选择类型", 
   new { @class = "form-control" })

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MVC 5 and below versions: Use the extension method

For the previous version of MVC 5, you can create an extension method to convert to

: SelectList

namespace MyApp.Common
{
    public static class MyExtensions{
        public static SelectList ToSelectList<TEnum>(this TEnum enumObj)
            where TEnum : struct, IComparable, IFormattable, IConvertible
        {
            var values = from TEnum e in Enum.GetValues(typeof(TEnum))
                select new { Id = e, Name = e.ToString() };
            return new SelectList(values, "Id", "Name", enumObj);
        }
    }
}

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This allows you to use the

Method: ToSelectList

ViewData["taskStatus"] = task.Status.ToSelectList();

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