Question

我有以下代码用于在“剃刀”页面中填充下拉菜单我想预先选择一个描述-可以在

中找到需要设置的“值”

s.User EstablishmentmentId

如何在下拉菜单中预先选择

@Html.DropDownList("drpEstablishments",
                    getEstablishments().Select(s => new SelectListItem()
                        {

                          Text = s.Description,
                          Value = s.EstablishId.ToString()
                      }),
                     new
                     {
                         @class = "dropdown form-control"
                     })

Answer 1

您正在使用linq为SelectListItem元素创建新的getEstablishments。创建SelectListItem()的每个实例时，您需要确定Selected是true还是false。只需用返回YourConditionForSelectionHere的方法或返回bool的语法替换bool，如下所示：

@Html.DropDownList("drpEstablishments",
                    getEstablishments().Select(s => new SelectListItem()
                        {
                          Selected = (YourConditionForSelectionHere),
                          Text = s.Description,
                          Value = s.EstablishId.ToString()
                      }),
                     new
                     {
                         @class = "dropdown form-control"
                     })

Answer 2

最后这样的事情奏效了

 Selected= (s.UserEstablishmentId==s.EstablishId)? true:false,

预选下拉列表剃须刀页面

2 个答案: