.Net BinaryFormater System.ArgumentNullException：对象图不能为空。参数名称：图

Question

我试图序列化对象的System.Collections.Generic.List，但运行到我无法弄清楚的错误。

我试图序列化的对象是相当香草，只是很多字符串和整数属性。

我正在使用以下代码来序列化对象列表。

private static Boolean WriteItemDataList(List<ItemData> itemDataList) 
    { 
     try 
     { 
      using (Stream stream = File.Open(@"H:\1.cache", FileMode.Create)) 
      { 
       BinaryFormatter binaryFormatter = new BinaryFormatter(); 
       binaryFormatter.Serialize(stream, itemDataList); 
      } 
     } 
     catch (Exception exception) 
     { 
      Trace.WriteLine(exception.ToString()); 

      return false; 
     } 

     return true; 
    } 

我得到这个错误。

A first chance exception of type 'System.ArgumentNullException' occurred in mscorlib.dll 
System.ArgumentNullException: Object Graph cannot be null. 
Parameter name: graph 
at System.Runtime.Serialization.Formatters.Binary.ObjectWriter.Serialize(Object graph, Header[] inHeaders, __BinaryWriter serWriter, Boolean fCheck) 
at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(Stream serializationStream, Object graph, Header[] headers, Boolean fCheck) 
at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(Stream serializationStream, Object graph) 
at A.B.C.Program.WriteItemDataList(List`1 itemDataList) in z:\dev\Projects\\\Program.cs:line 46 

这是在列表中的对象，我试图序列

using System; 
using System.IO; 
using System.Runtime.Serialization.Formatters.Binary; 


namespace A.B.ClassLibrary 
{ 
[Serializable()] 
public class ItemData 
{ 
    //FIELDS 
    protected String abcCode; 

    protected Decimal averageCost; 

    protected String basicUnitOfMeasure; 

    protected Int32 basicUnitOfMeasureOrderQuantity; 

    protected String businessArea; 

    protected String businessAreaDescription; 

    protected String buyer; 

    protected Decimal concraftsPrice; 

    protected String description; 

    protected String domesticImport; 

    protected Decimal dpPrice; 

    protected String itemGroup; 

    protected String itemGroupDescription; 

    protected String itemNumber; 

    protected String itemType; 

    protected String itemTypeDescription; 

    protected String name; 

    protected String nameOfUserResponsible; 

    protected Decimal netPrice; 

    protected Int32 onOrderQuantity; 

    protected String planner; 

    protected String prePrice; 

    protected Decimal prizmPrice; 

    protected String procurementGroup; 

    protected String procurementGroupDescription; 

    protected String procureMethod; 

    protected String productGroup; 

    protected String productGroupDescription; 

    protected Int32 purchaseMinimumQuantity; 

    protected Int32 purchaseMultipleQuantity; 

    protected String purchaseUnitOfMeasure; 

    protected Decimal quantityBreakPrice; 

    protected Int32 quantityBreakQuantity; 

    protected Int32 reservedQuantity; 

    protected String responsible; 

    protected Decimal retailPrice; 

    protected String royalty; 

    protected String salesPriceUnitOfMeasure; 

    protected String seasonality; 

    protected Int32 sellMinimumQuantity; 

    protected String sellUnitOfMeasure; 

    protected String status; 

    protected String supplierItemNumber; 

    protected String supplierName; 

    protected String supplierNumber; 

    protected String topCust; 

    protected Int32 totalLeadTime; 

    protected String upc; 

    protected Int32 warehouseOnHandQuantity; 


    //PROPERTIES 
    public virtual String AbcCode 
    { 
     get { return abcCode; } 

     set { abcCode = value; } 
    } 

    public virtual Decimal AverageCost 
    { 
     get { return averageCost; } 

     set { averageCost = value; } 
    } 

    public virtual String BasicUnitOfMeasure 
    { 
     get { return basicUnitOfMeasure; } 

     set { basicUnitOfMeasure = value; } 
    } 

    public virtual Int32 BasicUnitOfMeasureOrderQuantity 
    { 
     get { return basicUnitOfMeasureOrderQuantity; } 

     set { basicUnitOfMeasureOrderQuantity = value; } 
    } 

    public virtual String Buyer 
    { 
     get { return buyer; } 

     set { buyer = value; } 
    } 

    public virtual String BusinessArea 
    { 
     get { return businessArea; } 

     set { businessArea = value; } 
    } 

    public virtual String BusinessAreaDescription 
    { 
     get { return businessAreaDescription; } 

     set { businessAreaDescription = value; } 
    } 

    public virtual Decimal ConcraftsPrice 
    { 
     get { return concraftsPrice; } 

     set { concraftsPrice = value; } 
    } 

    public virtual String Description 
    { 
     get { return description; } 

     set { description = value; } 
    } 

    public virtual String DomesticImport 
    { 
     get { return domesticImport; } 

     set { domesticImport = value; } 
    } 

    public virtual Decimal DpPrice 
    { 
     get { return dpPrice; } 

     set { dpPrice = value; } 
    } 

    public virtual String ItemGroup 
    { 
     get { return itemGroup; } 

     set { itemGroup = value; } 
    } 

    public virtual String ItemGroupDescription 
    { 
     get { return itemGroupDescription; } 

     set { itemGroupDescription = value; } 
    } 

    public virtual String ItemNumber 
    { 
     get { return itemNumber; } 

     set { itemNumber = value; } 
    } 

    public virtual String ItemType 
    { 
     get { return itemType; } 

     set { itemType = value; } 
    } 

    public virtual String ItemTypeDescription 
    { 
     get { return itemTypeDescription; } 

     set { itemTypeDescription = value; } 
    } 

    public virtual String Name 
    { 
     get { return name; } 

     set { name = value; } 
    } 

    public virtual String NameOfUserResponsible 
    { 
     get { return nameOfUserResponsible; } 

     set { nameOfUserResponsible = value; } 
    } 

    public virtual Decimal NetPrice 
    { 
     get { return netPrice; } 

     set { netPrice = value; } 
    } 


    public virtual Int32 OnOrderQuantity 
    { 
     get { return onOrderQuantity; } 

     set { onOrderQuantity = value; } 
    } 

    public virtual String Planner 
    { 
     get { return planner; } 

     set { planner = value; } 
    } 

    public virtual String PrePrice 
    { 
     get { return prePrice; } 

     set { prePrice = value; } 
    } 

    public virtual Decimal PrizmPrice 
    { 
     get { return prizmPrice; } 

     set { prizmPrice = value; } 
    } 

    public virtual String ProcurementGroup 
    { 
     get { return procurementGroup; } 

     set { procurementGroup = value; } 
    } 

    public virtual String ProcurementGroupDescription 
    { 
     get { return procurementGroupDescription; } 

     set { procurementGroupDescription = value; } 
    } 

    public virtual String ProcureMethod 
    { 
     get { return procureMethod; } 

     set { procureMethod = value; } 
    } 

    public virtual String ProductGroup 
    { 
     get { return productGroup; } 

     set { productGroup = value; } 
    } 

    public virtual String ProductGroupDescription 
    { 
     get { return productGroupDescription; } 

     set { productGroupDescription = value; } 
    } 

    public virtual Int32 PurchaseMinimumQuantity 
    { 
     get { return purchaseMinimumQuantity; } 

     set { purchaseMinimumQuantity = value; } 
    } 

    public virtual Int32 PurchaseMultipleQuantity 
    { 
     get { return purchaseMultipleQuantity; } 

     set { purchaseMultipleQuantity = value; } 
    } 

    public virtual String PurchaseUnitOfMeasure 
    { 
     get { return purchaseUnitOfMeasure; } 

     set { purchaseUnitOfMeasure = value; } 
    } 

    public virtual Decimal QuantityBreakPrice 
    { 
     get { return quantityBreakPrice; } 

     set { quantityBreakPrice = value; } 
    } 

    public virtual Int32 QuantityBreakQuantity 
    { 
     get { return quantityBreakQuantity; } 

     set { quantityBreakQuantity = value; } 
    } 

    public virtual Int32 ReservedQuantity 
    { 
     get { return reservedQuantity; } 

     set { reservedQuantity = value; } 
    } 

    public virtual String Responsible 
    { 
     get { return responsible; } 

     set { responsible = value; } 
    } 

    public virtual Decimal RetailPrice 
    { 
     get { return retailPrice; } 

     set { retailPrice = value; } 
    } 

    public virtual String Royalty 
    { 
     get { return royalty; } 

     set { royalty = value; } 
    } 

    public virtual String Seasonality 
    { 
     get { return seasonality; } 

     set { seasonality = value; } 
    } 

    public virtual Int32 SellMinimumQuantity 
    { 
     get { return sellMinimumQuantity; } 

     set { sellMinimumQuantity = value; } 
    } 

    public virtual String SellUnitOfMeasure 
    { 
     get { return sellUnitOfMeasure; } 

     set { sellUnitOfMeasure = value; } 
    } 

    public virtual String Status 
    { 
     get { return status; } 

     set { status = value; } 
    } 

    public virtual String SupplierItemNumber 
    { 
     get { return supplierItemNumber; } 

     set { supplierItemNumber = value; } 
    } 

    public virtual String SupplierName 
    { 
     get { return supplierName; } 

     set { supplierName = value; } 
    } 

    public virtual String SupplierNumber 
    { 
     get { return supplierNumber; } 

     set { supplierNumber = value; } 
    } 

    public virtual String TopCust 
    { 
     get { return topCust; } 

     set { topCust = value; } 
    } 

    public virtual Int32 TotalLeadTime 
    { 
     get { return totalLeadTime; } 

     set { totalLeadTime = value; } 
    } 

    public virtual String UPC 
    { 
     get { return upc; } 

     set { upc = value; } 
    } 

    public virtual Int32 WarehouseOnHandQuantity 
    { 
     get { return warehouseOnHandQuantity; } 

     set { warehouseOnHandQuantity = value; } 
    } 



    //INITIALIZE 
    public ItemData() 
    { 
     abcCode = null; 

     averageCost = 0; 

     basicUnitOfMeasure = null; 

     basicUnitOfMeasureOrderQuantity = 0; 

     buyer = null; 

     businessArea = null; 

     businessAreaDescription = null; 

     concraftsPrice = 0; 

     description = null; 

     dpPrice = 0; 

     domesticImport = null; 

     itemGroup = null; 

     itemGroupDescription = null; 

     itemNumber = null; 

     itemType = null; 

     itemTypeDescription = null; 

     name = null; 

     nameOfUserResponsible = null; 

     netPrice = 0; 

     onOrderQuantity = 0; 

     planner = null; 

     prePrice = null; 

     prizmPrice = 0; 

     procurementGroup = null; 

     procurementGroupDescription = null; 

     procureMethod = null; 

     productGroup = null; 

     productGroupDescription = null; 

     purchaseMinimumQuantity = 0; 

     purchaseMultipleQuantity = 0; 

     purchaseUnitOfMeasure = null; 

     quantityBreakPrice = 0; 

     quantityBreakQuantity = 0; 

     reservedQuantity = 0; 

     responsible = null; 

     retailPrice = 0; 

     royalty = null; 

     seasonality = null; 

     sellMinimumQuantity = 0; 

     sellUnitOfMeasure = null; 

     status = null; 

     supplierItemNumber = null; 

     supplierName = null; 

     supplierNumber = null; 

     topCust = null; 

     totalLeadTime = 0; 

     upc = null; 

     warehouseOnHandQuantity = 0; 
    } 
} 

}

Answer 1

为BinaryFormatter.Serialize的文档指出它会抛出一个ArgumentNullException如果任一serializationStream或的参数是null。由于该消息明确指出“对象图不能为空”，这意味着参数为null，所以itemDataList参数对您的WriteItemDataList方法必须为null。