MVC Enum DropDown - Dynamic load - asp.net-mvc

Question

Am trying to Bind Dropdown in MVC using Enum and it works great !! Here is sample code
//Enum Set up
public enum Name
{
Name1,
Name2,
Name3
}
public enum Number
{
11,
12,
13
}
public Name nameDropDown { get; set; }
public Number numberDropDown { get; set; }
//Like this i have have 10 Enums
//View
#Html.EnumDropDownListFor(m => m.numberDropDown) or #Html.EnumDropDownListFor(m => m.nameDropDown)
Here is where i got struck !!I am going to load only one dropdown in my view based on the condition. I can have if else if and load the drop down based on the condition. But as i have large list it wont be that good.
Is there a alternative way i can decide which enum to bind in my view ? Like dynamically locating based on the condition. Please suggest

Answer 1

There is no easy way to achieve this. One way would be to create an extension method, something like:
public enum Name { Name1, Name2, Name3 }
public enum Number { Number1, Number2, Number3 }
public class ViewModel
{
public Name nameDropDown { get; set; }
public Number numberDropDown { get; set; }
// x number of other enum properties
}
public static class MyHtmlHelpers
{
public static MvcHtmlString MyEnumDropDownListFor(this HtmlHelper html, string propertyName)
{
var propertyInfo = typeof(ViewModel).GetProperty(propertyName);
if (propertyInfo == null) return null;
var expParam = Expression.Parameter(typeof(ViewModel));
var expProp = Expression.Property(expParam, propertyName);
var expression = Expression.Lambda(expProp, expParam);
var htmlStr = (MvcHtmlString) typeof(SelectExtensions)
.GetMethods()
.First(m => m.Name == "EnumDropDownListFor" && m.IsGenericMethod)
.MakeGenericMethod(typeof(ViewModel), propertyInfo.PropertyType)
.Invoke(null, new object[] { html, expression });
return htmlStr;
}
}
And your view could fetch the property name from the query string and based on that show the dropdown list:
#model ViewModel
#{
var propertyName = Request["property"] ?? "numberDropDown";
}
#Html.MyEnumDropDownListFor(propertyName)