asp.net-mvc – MissingMethodException：“此对象没有无参数构

免责声明：是的,我已经 googled并阅读了0700和 found lots的前六个左右,但是他们都没有帮助我解决这个问题… This one,特别是 this answer,似乎非常接近,但我仍然无法弄明白.因此,即使我似乎问了一个之前被问过很多次的问题,请耐心等待.

题

当我提交表单时,我得到一个System.MissingMethodException,说“没有为此对象定义无参数构造函数”.似乎有许多不同的,相当常见的原因 – 两个最突出的原因是Controller缺少默认构造函数,并且在DI框架试图解析它时没有满足它的依赖性,分别表示输入模型在action方法上没有默认的构造函数.从我的堆栈跟踪中,我推断出后者似乎是我的问题 – 然而,我无处可去尝试解决这个问题.

背景信息

我的堆栈跟踪：

[MissingMethodException: No parameterless constructor defined for this object.]

System.RuntimeTypeHandle.CreateInstance(RuntimeType type,Boolean publicOnly,Boolean noCheck,Boolean& canBeCached,RuntimeMethodHandleInternal& ctor,Boolean& bNeedSecurityCheck) +0
System.RuntimeType.CreateInstanceSlow(Boolean publicOnly,Boolean skipCheckThis,Boolean fillCache) +117
System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly,Boolean skipVisibilityChecks,Boolean fillCache) +247
System.Activator.CreateInstance(Type type,Boolean nonPublic) +106
System.Web.Mvc.DefaultModelBinder.CreateModel(ControllerContext controllerContext,ModelBindingContext bindingContext,Type modelType) +243
System.Web.Mvc.DefaultModelBinder.BindComplexModel(ControllerContext controllerContext,ModelBindingContext bindingContext) +151
etc… it goes on for a while…

但是,我的模型确实有一个无参数构造函数(参见下面的代码)！

我的POST动作方法签名：

[HttpPost]
public ActionResult AddObject(InspectionObjectEditModel input,IUser user)
// IUser is passed with a custom model binder,that is verified to work

我的GET动作方法,显示形式：

public ActionResult CreateObject()
{
    var model = GetEditModelForID(0); // Calls new InspectionObjectEditModel()
    model.PostAction = "AddObject";
    return View(model);
}

InspectionObjectEditModel：

public class InspectionObjectEditModel : ViewModel<InspectionObject,int>,IInspectionObjectData
{
    // ReSharper warns on the constructor,because it's redundant
    public InspectionObjectEditModel() { }

    #region Properties for editing
    [Required]
    [DisplayNameLocalized("Littera")]
    public virtual string Littera { get; set; }
    [Required]
    [DisplayNameLocalized("IInspectionObjectData_Type")]
    public virtual InspectionObjectType Type { get; set; }
    [Required,NotNull]
    [DisplayNameLocalized("IInspectionObjectData_Name")]
    public virtual string Name { get; set; }
    [Required]
    [DisplayNameLocalized("IInspectionObjectData_Owner")]
    public virtual string Owner { get; set; }
    [Required]
    [DisplayNameLocalized("IInspectionObjectData_Address")]
    public virtual string Address { get; set; }
    [Required]
    [DisplayNameLocalized("IInspectionObjectData_Caretaker")]
    public virtual string Caretaker { get; set; }
    [DisplayNameLocalized("IInspectionObjectData_Remarks")]
    public virtual string Remarks { get; set; }
    [Required]
    [DisplayNameLocalized("IInspectionObjectData_X")]
    public virtual float PlacementX { get; set; }
    [Required]
    [DisplayNameLocalized("IInspectionObjectData_Y")]
    public virtual float PlacementY { get; set; }
    [Required]
    [DisplayNameLocalized("IInspectionObjectData_Z")]
    public virtual float PlacementZ { get; set; }
    #endregion

    #region Data for form elements
    public virtual List<InspectionObjectType> Types { get; set; }
    public virtual bool Geocode { get; set; }

    //public Expression<Action<InspectionController>> PostAction { get; set; }
    public virtual string PostAction { get; set; }
    #endregion

    #region Properties that won't be edited
    public virtual Project Project { get; set; }
    public virtual DateTime Created { get; set; }
    public virtual User CreatedByUser { get; set; }
    public virtual DateTime? LastUpdated { get; set; }
    public virtual User LastUpdatedByUser { get; set; }
    public IList<InspectionActivity> Activities { get; set; }
    #endregion
}