Asp.net mvc asp.net mvc选择列表

使用selectlist如何输入“请选择”。有办法吗

 GrpDown = new SelectList(_db.Groups.Where(m => m.vcr_GroupName != "SuperAdmin" && m.int_Priority >= Authorization.Priority && m.bit_Active == true).ToList(), "int_GroupId", "vcr_GroupName");

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我希望我已经理解了你的问题。试着做以下几点：

var ListOfThings = _db.Groups.Where(m => m.vcr_GroupName != "SuperAdmin" && m.int_Priority >= Authorization.Priority && m.bit_Active == true).ToList();

ListOfThings.Insert(0, "Please Select"); // <-- Here you want to enter an item that has the caption "Please Select"

GrpDown = new SelectList(ListOfThings, "int_GroupId", "vcr_GroupName"); 

var ListOfThings=\u db.Groups.Where（m=>m.vcr\u GroupName！=“SuperAdmin”&&m.int\u Priority>=Authorization.Priority&&m.bit\u Active==true）。ToList（）；
物品清单。插入（0，“请选择”）//