mvc Html.DropDownListFor 获取值为null
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悬赏园豆：10
[待解决问题]
@Html.DropDownListFor(model => model.Birthday.Year,ViewData["year"] as SelectList)
@Html.DropDownListFor(model => model.Birthday.Month,ViewData["month"] as SelectList)
@Html.DropDownListFor(model => model.Birthday.Date,ViewData["date"] as SelectList)
将日期换为下拉框DropDownListFor，页面可以显示数据库日期的值，但点保存 model中Birthday为null，不知为何，这样写法有错误？
所有回答(1)
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传到后台的是 year,Month,data 而不是 Birthday
