单选按钮 – MVC 5 RadioButtonFor枚举,始终选择默认的枚举值零

public enum OrderStatusType
{
    Waiting = 0,Pending,Picked,Shipped,}

我生成单选按钮列表如下.

@Html.RadioButtonFor(m => m.Status,OrderStatusType.Shipped,new {@checked = true})
@Html.RadioButtonFor(m => m.Status,OrderStatusType.Waiting)

但等待总是被选中.输出HTML如下：

input type="radio" value="Shipped" name="Status" id="Status" checked="True"
input type="radio" value="Waiting" name="Status" id="Status" checked="checked"

为什么MVC框架自动添加“已检查”属性？
谢谢.

该模型：

public class OrderViewModel
{
    public OrderStatusType Status { get; set; }
}

风景：

@using WebApplication17.Controllers
@model WebApplication17.Models.OrderViewModel

@{
    ViewBag.Title = "Home Page";
}


@Html.RadioButtonFor(m => m.Status,OrderStatusType.Picked)
<span>@OrderStatusType.Picked</span>

@Html.RadioButtonFor(m=>m.Status,OrderStatusType.Pending)
<span>@OrderStatusType.Pending</span>

@Html.RadioButtonFor(m => m.Status,new {@checked = true})
<span>@OrderStatusType.Shipped</span>

@Html.RadioButtonFor(m => m.Status,OrderStatusType.Waiting)
<span>@OrderStatusType.Waiting</span>