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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" } })
ASP.NET MVC5 DropDownListFor中bool?类型赋值为null的解决办法
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原文地址：http://www.cnblogs.com/LzxHehehe/p/4427545.html
