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在MVC 3中回发到控制器操作后,ViewModel集合属性丢失了值

我有我的视图模型:

public class POReceiptViewModel
{
    public virtual int PONumber { get; set; }
    public virtual string VendorCode { get; set; }

    public virtual IList<POReceiptItemViewModel> POReceiptItems { get; set; }

    public POReceiptViewModel()        
    {
        POReceiptItems = new List<POReceiptItemViewModel>();
    }
}

public class POReceiptItemViewModel
{
    public virtual string ItemCode { get; set; }
    public virtual string ItemDesription { get; set; }
    public virtual decimal OrderedQuantity { get; set; }
    public virtual decimal ReceivedQuantity { get; set; }
    public virtual DateTime ReceivedDate { get; …
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asp.net-mvc viewmodel razor asp.net-mvc-3

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