MVC Dropdownlist数据绑定 默认值

@Html.DropDownList("Data", (SelectList)ViewBag.Data, new { @class = "form-control chosen-select-disable_search", data_placeholder = "请选择..." })

List Data= new List();
Data.Add(new SelectListItem { Text = "AA", Value = "" });
Data.Add(new SelectListItem { Text = "BB", Value = "", Selected = true });
ViewBag.Data= Data;

按照上面的代码给Dropdownlist数据源设置了默认值，但实际上预览的时候并没有绑定默认值。后来研究发现，ViewBag的参数名和Dropdownlist的name不能重名

将cshtml中的代码改为下面这样既可。

@Html.DropDownList("Data1", (SelectList)ViewBag.Data, new { @class = "form-control chosen-select-disable_search", data_placeholder = "请选择..." })