下拉菜单未选择正确的值

Question

以下代码有什么问题？

    @Html.DropDownListFor(model => model.title, new List<SelectListItem>
  {
      new SelectListItem { Text = "Other" , Value = "Other"},
      new SelectListItem { Text = "Mr", Value = "Mr" },
      new SelectListItem { Text = "Mrs", Value = "Mrs" },
      new SelectListItem { Text = "Ms", Value = "Ms" },
      new SelectListItem { Text = "Miss", Value = "Miss" }
    }, 
      new { @class = "form-control" })

上面允许我 select 并将值保存到 table，但是当涉及到编辑时，保存的值不是 selected

例如，现有数据在编辑时使用 "Mr" 保存，显示 "Other"

为什么？

Answer 1

尝试使用 SelectList with this overload 以下方式：

@Html.DropDownListFor(model => model.title, new SelectList(new List<SelectListItem>
  {
      new SelectListItem { Text = "Other" , Value = "Other"},
      new SelectListItem { Text = "Mr", Value = "Mr" },
      new SelectListItem { Text = "Mrs", Value = "Mrs" },
      new SelectListItem { Text = "Ms", Value = "Ms" },
      new SelectListItem { Text = "Miss", Value = "Miss" }
    },
    "Value",
    "Text",
     Model.Title), 
     new { @class = "form-control" })

SelectList Constructor (IEnumerable, String, String, String, Object)

public SelectList(
    IEnumerable items,
    string dataValueField,
    string dataTextField,
    string dataGroupField,
    Object selectedValue
)

Answer 2

这是最糟糕的

它在这个原因中起作用，但不是上面的那个

  @Html.DropDownListFor(model => model.PreferredContact, new List<SelectListItem>
                                            {
                                            new SelectListItem { Text = "Other" },
                                            new SelectListItem { Text = "Telephone", Value = "Telephone" } ,
                                            new SelectListItem { Text = "Email", Value = "Email" },
                                            new SelectListItem { Text = "Post", Value = "Post" }
                                            }, new { @class = "form-control" })

Answer 3

好的

我发现了问题

您不能使用 "title" 作为名称。标题是 HTML5 上的属性。我将该字段重命名为 dTitle 并且有效

下拉菜单未选择正确的值

Dropdown not selecting correct value

c#

asp.net-mvc

razor