EnumDropDownListFor does not select the current value when the field is nested

[abidingotter]

Title

When using EnumDropDownListFor on a nested property on a model, the dropdown values are populated but the current selection is not selected.

Functional impact

EnumDropDownListFor is only ever useful for top level model properties.

Minimal repro steps

public class Model 
{
    public MyEnumType MyEnum { get; set; }
    public FooModel Foo { get; set; }
}

public class FooModel
{
    public MyEnumType MyEnum { get; set; }
}

public enum MyEnumType 
{
    A,
    B,
    C
}
…
model.MyEnum = MyEnumType.B;
model.Foo.MyEnum = MyEnumType.B;

@model Model
@* Works fine, B is selected *@
@Html.EnumDropDownListFor(m => m.MyEnum)
@* Does not work, B is not selected *@
@Html.EnumDropDownListFor(m => m.Foo.MyEnum)

Expected result

The value of B is selected in the dropdown in the second case above.

Actual result

The select options render with none of them being selected.

Further technical details

Using MVC 5.27 from NuGet

[mkArtakMSFT]

Thank you for contacting us. We are currently only fixing critical functional issues in the code base, and have decided to not make this change.