ASP.NET MVC5 DropDownListFor中bool?类型赋值为null的解决办法

 

使用ToString() 将null转换为string即可

@Html.DropDownListFor(model => model.AllowedPublished,
　　new List<SelectListItem> {
　　new SelectListItem() { Text = "未审核", Value = (null as bool?).ToString() },
　　new SelectListItem() { Text = "已通过", Value = "true" },
　　new SelectListItem() { Text = "未通过", Value = "false" }
})