模板在表单发布到控制器时始终为NULL

Question

每当我提交表单时,传递给控制器​​的模型都是NULL.我花了很长时间看这个.我想我在这里缺少一些基本的东西.

@model VisitorPortal.Models.ReinviteVisitorModel
@using (Html.BeginForm("CreateMeeting", "Home", FormMethod.Post, new { @class = "form-horizontal", role = "form" }))
{
    @Html.AntiForgeryToken()
    <h3>Reinvitation Details</h3>
    <div>The information entered below will be sent to the visitors email address @Model.Info.Email</div>
    <hr />
    @Html.ValidationSummary("", new { @class = "text-danger" })
    <div class="form-group">
        @Html.LabelFor(m => m.NewMeeting.Title, new { @class = "col-md-2 control-label" })
        <div class="col-md-10">
            @Html.TextBoxFor(m => m.NewMeeting.Title, new { @class = "form-control" })
        </div>
    </div>
    <div class="form-group">
        @Html.LabelFor(m => m.NewMeeting.StartTime, new { @class = "col-md-2 control-label" })
        <div class="col-md-10">
            @Html.TextBoxFor(m => m.NewMeeting.StartTime, new { @class = "datetimepicker form-control" })
        </div>
    </div>
    <div class="form-group">
        @Html.LabelFor(m => m.NewMeeting.EndTime, new { @class = "col-md-2 control-label" })
        <div class="col-md-10">
            @Html.TextBoxFor(m => m.NewMeeting.EndTime, new { @class = "datetimepicker form-control" })
        </div>
    </div>
    <div class="form-group">
        <div class="col-md-offset-2 col-md-10">
            @Html.HiddenFor(m => m.NewMeeting.SubjectId, new { @Value = Model.Info.SubjectId })
            <input type="submit" class="btn btn-default" value="Send Invite" />
        </div>
    </div>
}

该模型是:

public class Meeting
{
    [Key]
    public int Id { get; set; }

    public string SubjectId { get; set; }

    [Required]
    [Display(Name = "Reason for invitation")]
    public string Title { get; set; }

    [Required]
    [Display(Name = "Start Time")]
    [DataType(DataType.Time)]
    public DateTime StartTime { get; set; }

    [Required]
    [Display(Name = "End Time")]
    [DataType(DataType.Time)]
    public DateTime EndTime { get; set; }

    public string HostEmail { get; set; }

    public string HostMobile { get; set; }    
}

public class MeetingsDBContext: DbContext
{
    public DbSet<Meeting> Meetings { get; set; }
}

public class ReinviteVisitorModel
{
    public Visitor Info;
    public Meeting NewMeeting;
    public List<Meeting> Meetings;
}

Controller的行动是:

    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult CreateMeeting(Meeting meeting)
    {
        return RedirectToAction("ReinviteVisitor2", "Home", new { visitorId = meeting.SubjectId });
    }

我在模型中有字段,例如Id,我期望数据库填充我将在动作CreateMeeting()中编写的内容.是否必须在表单中使用模型中的所有字段？

Answer 1

视图中的模型是typeof ReinviteVisitorModel,这意味着自发布以来POST方法的签名必须匹配ReinviteVisitorModel

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult CreateMeeting(ReinviteVisitorModel model)

或者,您可以使用Prefix属性BindAttribute来NewMeeting从您发布的表单控件的名称中去除前缀​​.

public ActionResult CreateMeeting([Bind(Prefix="NewMeeting")]Meeting model)

附注:new { @Value = Model.Info.SubjectId }从隐藏输入中删除,而是NewMeeting.SubjectId在将模型传递给视图之前设置GET方法中的值.