for循环中的MVC Ajax表单仅适用于第一个循环项

我有一个页面，显示要开具发票的付款列表，付款被分组到客户中，每个组周围都有一个Ajax表单。当我在页面上提交第一组发票的第一张表单时，它会正确发回，并且我会将填充模型发送给我的控制器进行处理。如果我提交任何其他表单，表单会将所有数据发回（我可以使用firebug看到它发送了所有数据），但是调用controller方法时MVC不会填充我的模型，它只会返回为null

我的看法是：

@for (int i = 0; i < Model.InvoicingReportModels.Count(); i++)
{
    @Html.EditorFor(m => m.InvoicingReportModels[i], "_InvoicingReportModel")
}

我的模型

public class InvoicingModel
{
    public List<InvoicingReportModel> InvoicingReportModels { get; set; }
    public InvoicingModel()
    {
        InvoicingReportModels = new List<InvoicingReportModel>();
    }
}

public class InvoicingReportModel
    {
        public int MasterAccountID { get; set; }
        public string DisplaySummary { get; set; }
        public string InvoiceNumber { get; set; }
        [DataType(DataType.Currency)]
        public double TotalPrice
        {
            get
            {
                if (Payments != null && Payments.Count > 0)
                {
                    return Payments.Sum(p => p.TotalPrice);
                }
                else
                {
                    return 0.0;
                }
            }
        }
        public List<PaymentListModel> Payments { get; set; }

        public InvoicingReportModel()
        {
            Payments = new List<PaymentListModel>();
        }
    }

public class PaymentListModel
{
    public int PaymentID { get; set; }
    public string DisplayPaymentID { get; set; }
    [DataType(DataType.Currency)]
    public double TotalPrice { get; set; }
    public string PaymentMethod { get; set; }
    public string InvoiceNumber { get; set; }
    public bool Selected { get; set; }
    public bool SingleSaveSelected { get; set; }
    public DateTime Date { get; set; }

    public string InvoiceNumberFieldID { get; set; }
    public PaymentType PaymentType { get; set; }
}

---

我想出了解决办法。若要对缺少的数组元素使用模型绑定器，您需要为每个名为Index的数组元素提供一个隐藏字段。将表单移动到顶层视图中，并为每个迭代添加一个隐藏的索引元素，如下所示，所有操作都正常

@for (int i = 0; i < Model.InvoicingReportModels.Count; i++ )
{   
    using (Ajax.BeginForm(new AjaxOptions() { HttpMethod = "POST", OnSuccess = "InvoiceSaved", OnFailure = "InvoiceSaveFailed" }))
    {
        @Html.Hidden("InvoicingReportModels.Index", i)
        @Html.EditorFor(m => Model.InvoicingReportModels[i], "_InvoicingReportModel")
    }
}

for（int i=0；iModel.InvoicingReportModels[i]，“\u InvoicingReportModel”） } }

public class InvoicingModel
{
    public List<InvoicingReportModel> InvoicingReportModels { get; set; }
    public InvoicingModel()
    {
        InvoicingReportModels = new List<InvoicingReportModel>();
    }
}

public class InvoicingReportModel
    {
        public int MasterAccountID { get; set; }
        public string DisplaySummary { get; set; }
        public string InvoiceNumber { get; set; }
        [DataType(DataType.Currency)]
        public double TotalPrice
        {
            get
            {
                if (Payments != null && Payments.Count > 0)
                {
                    return Payments.Sum(p => p.TotalPrice);
                }
                else
                {
                    return 0.0;
                }
            }
        }
        public List<PaymentListModel> Payments { get; set; }

        public InvoicingReportModel()
        {
            Payments = new List<PaymentListModel>();
        }
    }

public class PaymentListModel
{
    public int PaymentID { get; set; }
    public string DisplayPaymentID { get; set; }
    [DataType(DataType.Currency)]
    public double TotalPrice { get; set; }
    public string PaymentMethod { get; set; }
    public string InvoiceNumber { get; set; }
    public bool Selected { get; set; }
    public bool SingleSaveSelected { get; set; }
    public DateTime Date { get; set; }

    public string InvoiceNumberFieldID { get; set; }
    public PaymentType PaymentType { get; set; }
}

Parametersapplication/x-www-form-urlencoded
InvoicingReportModels[2]....    1316 - Some Thing Here
InvoicingReportModels[2]....    123
InvoicingReportModels[2]....    1316
InvoicingReportModels[2]....    
InvoicingReportModels[2]....    InvoicingReportModels_2__Payments_0__InvoiceNumber
InvoicingReportModels[2]....    13276
InvoicingReportModels[2]....    Standard
InvoicingReportModels[2]....    true
InvoicingReportModels[2]....    false
InvoicingReportModels[2]....    False
InvoicingReportModels[2]....    
InvoicingReportModels[2]....    InvoicingReportModels_2__Payments_1__InvoiceNumber
InvoicingReportModels[2]....    13298
InvoicingReportModels[2]....    Standard
InvoicingReportModels[2]....    true
InvoicingReportModels[2]....    false
InvoicingReportModels[2]....    False
X-Requested-With    XMLHttpRequest
submit  Save Selected
Source
submit=Save+Selected&InvoicingReportModels%5B2%5D.DisplaySummary=1316+-+Some+thing+Here&InvoicingReportModels%5B2%5D.MasterAccountID=1316&InvoicingReportModels%5B2%5D.Payments%5B0%5D.Selected=true&InvoicingReportModels%5B2%5D.Payments%5B0%5D.Selected=false&InvoicingReportModels%5B2%5D.Payments%5B0%5D.SingleSaveSelected=False&InvoicingReportModels%5B2%5D.Payments%5B0%5D.PaymentID=13276&InvoicingReportModels%5B2%5D.Payments%5B0%5D.PaymentType=Standard&InvoicingReportModels%5B2%5D.Payments%5B0%5D.InvoiceNumber=&InvoicingReportModels%5B2%5D.Payments%5B0%5D.InvoiceNumberFieldID=InvoicingReportModels_2__Payments_0__InvoiceNumber&InvoicingReportModels%5B2%5D.Payments%5B1%5D.Selected=true&InvoicingReportModels%5B2%5D.Payments%5B1%5D.Selected=false&InvoicingReportModels%5B2%5D.Payments%5B1%5D.SingleSaveSelected=False&InvoicingReportModels%5B2%5D.Payments%5B1%5D.PaymentID=13298&InvoicingReportModels%5B2%5D.Payments%5B1%5D.PaymentType=Standard&InvoicingReportModels%5B2%5D.Payments%5B1%5D.InvoiceNumber=&InvoicingReportModels%5B2%5D.Payments%5B1%5D.InvoiceNumberFieldID=InvoicingReportModels_2__Payments_1__InvoiceNumber&InvoicingReportModels%5B2%5D.InvoiceNumber=123&X-Requested-With=XMLHttpRequest

@for (int i = 0; i < Model.InvoicingReportModels.Count; i++ )
{   
    using (Ajax.BeginForm(new AjaxOptions() { HttpMethod = "POST", OnSuccess = "InvoiceSaved", OnFailure = "InvoiceSaveFailed" }))
    {
        @Html.Hidden("InvoicingReportModels.Index", i)
        @Html.EditorFor(m => Model.InvoicingReportModels[i], "_InvoicingReportModel")
    }
}