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$('select').val()+""
js传参的时候强行转换成字符串,然后后台再用string获取
@{
departments_list = new List<SelectListItem>();
departments_list.Add( new SelectListItem(){Text="123",Value = "1"} );
departments_list.Add( new SelectListItem(){Text="234",Value = "2"} );
departments_list.Add( new SelectListItem(){Text="345",Value = "4"} );
}
@Html.DropDownList( "department", departments_list, new
{
@class = "department",
@multiple = "multiple"
} )