c# - MVC Razor 柱模型为空

Question

可能在这里遗漏了一些明显的东西，但我发布到 Controller 的模型始终为空...模型正确传递到 View 并且我可以访问属性，但是在提交表单时，模型为空。为什么？

模型...

public class ProfileModel
{

    public MembershipUser user { get; set; }
    public ProfileSettingsModel settings { get; set; }


}

Controller ...

    [HttpPost]
    public ActionResult SaveSettings(ProfileModel model)
    {
        var x = model.user.UserName;
        return View();
    }

查看...

 @model MyApp.Models.Profile.ProfileModel

 @using(Html.BeginForm("SaveSettings","Profile"))
    {

        //Tried removing these as I shouldn't need them, but no luck.
        @Html.HiddenFor(x=>x.settings)
        @Html.HiddenFor(x=>x.user)

        @Html.CheckBoxFor(model=>model.settings.VisitorsCanAddMeAsFriend)
        @Html.LabelFor(x=>x.settings.VisitorsCanAddMeAsFriend, "Visitors can add me as a friend")
        @Html.CheckBoxFor(x=>x.settings.VisitorsCanMessageMe)
        @Html.LabelFor(x=>x.settings.VisitorsCanMessageMe, "Visitors can message me")

         <button id="save" type="submit" class="btn btn-default">Save</button>

     }

呈现的 HTML...

<form action="/Profile/SaveSettings?HttpMethod=POST&amp;InsertionMode=Replace&amp;LoadingElementDuration=0&amp;AllowCache=False" method="post" novalidate="novalidate">
    <input data-val="true" data-val-required="The VisitorsCanAddMeAsFriend field is required." id="settings_VisitorsCanAddMeAsFriend" name="settings.VisitorsCanAddMeAsFriend" type="checkbox" value="true">
    <input name="settings.VisitorsCanAddMeAsFriend" type="hidden" value="false">
    <label for="settings_VisitorsCanAddMeAsFriend">Visitors can add me as a friend</label>
    <input data-val="true" data-val-required="The VisitorsCanMessageMe field is required." id="settings_VisitorsCanMessageMe" name="settings.VisitorsCanMessageMe" type="checkbox" value="true">
    <input name="settings.VisitorsCanMessageMe" type="hidden" value="false">
    <label for="settings_VisitorsCanMessageMe">Visitors can message me</label>                 
    <button id="save" type="submit" class="btn btn-default">Save</button>
</form>

有什么明显的吗？

Answer 1

您不能在模型绑定(bind)中使用 MembershipUser。模型绑定(bind)要求所有属性都有一个公共(public)的无参数构造函数，MembershipUser 的无参数构造函数是 protected 。因此，您不能直接使用它。您将需要创建自己的 View 模型来传递属性。

因此，删除设置和用户 HiddenFor's，然后直接对这些属性进行出价将获得您想要的结果。