Razor中的Enum下拉值必需错误

Question

Is there any way to make an enum's dropdownlist optional? When the form posts with no value for this dropdown, ModelState.IsValid evaluates to false with an error that a value is required for this dropdown. I have not explicitly used [Required] attribute on this property.

@Html.EnumDropDownListFor(m => m.People[0].Role, "Select a role", new { @class = "form-control role" })

The enum is:

public enum RoleType { Employee, Visitor, Vendor, Witness }

Answer 1

Is the property m.People[0].Role nullable in your model. You can set the RoleType to be nullable and this should remove the validation error.

public RoleType? Role {get;set;}

Answer 2

It appears that there is a way that you can remove specific properties from the ModelState by using something like

ModelState.Remove("nameOfProperty");

This info was found on another Stackoverflow post at the following link

ModelState.IsValid does not exclude required property

Not sure if this relates directly to your issue, but hope this helps.