Accord.Net 在反序列化 Codification 实例时抛出空引用异常答案

【问题标题】：Accord.Net throws Null Reference Exception when deserializing an instance of CodificationAccord.Net 在反序列化 Codification 实例时抛出空引用异常
【发布时间】：2017-04-22 08:38:18
【问题描述】：

使用 Accord.Net，我正在尝试序列化/反序列化 Codification 类的实例，但在尝试反序列化时收到空引用异常。序列化对象时我没有遇到问题。如果实例没有初始化列，则不会引发异常。

 System.NullReferenceException was unhandled by user code
  Message=Object reference not set to an instance of an object.
  Source=Accord
  StackTrace:
       at Accord.Collections.TwoWayDictionary`2.OnDeserialized(StreamingContext context)
       at System.Runtime.Serialization.SerializationEventHandler.Invoke(StreamingContext context)
       at System.Runtime.Serialization.ObjectManager.RaiseDeserializationEvent()
       at System.Runtime.Serialization.Formatters.Binary.ObjectReader.Deserialize(HeaderHandler handler, __BinaryParser serParser, Boolean fCheck, Boolean isCrossAppDomain, IMethodCallMessage methodCallMessage)
       at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize(Stream serializationStream, HeaderHandler handler, Boolean fCheck, Boolean isCrossAppDomain, IMethodCallMessage methodCallMessage)
       at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize(Stream serializationStream)

我使用 NaiveBayes 中的示例表进行测试

        DataTable table = new DataTable("Mitchell's Tennis Example");

        table.Columns.AddRange(new DataColumn[]{
            new DataColumn("Day", typeof(string)),
            new DataColumn("Outlook", typeof(string)),
            new DataColumn("Temperature", typeof(string)),
            new DataColumn("Humidity", typeof(string)),
            new DataColumn("Wind", typeof(string)),
            new DataColumn("PlayTennis", typeof(string))});

        table.Rows.Add("D1", "Sunny", "Hot", "High", "Weak", "No");
        table.Rows.Add("D2", "Sunny", "Hot", "High", "Strong", "No");
        table.Rows.Add("D3", "Overcast", "Hot", "High", "Weak", "Yes");
        table.Rows.Add("D4", "Rain", "Mild", "High", "Weak", "Yes");
        table.Rows.Add("D5", "Rain", "Cool", "Normal", "Weak", "Yes");
        table.Rows.Add("D6", "Rain", "Cool", "Normal", "Strong", "No");
        table.Rows.Add("D7", "Overcast", "Cool", "Normal", "Strong", "Yes");
        table.Rows.Add("D8", "Sunny", "Mild", "High", "Weak", "No");
        table.Rows.Add("D9", "Sunny", "Cool", "Normal", "Weak", "Yes");
        table.Rows.Add("D10", "Rain", "Mild", "Normal", "Weak", "Yes");
        table.Rows.Add("D11", "Sunny", "Mild", "Normal", "Strong", "Yes");
        table.Rows.Add("D12", "Overcast", "Mild", "High", "Strong", "Yes");
        table.Rows.Add("D13", "Overcast", "Hot", "Normal", "Weak", "Yes");
        table.Rows.Add("D14", "Rain", "Mild", "High", "Strong", "No");


        Codification codebook = new Codification(table);

        BinaryFormatter bf = new BinaryFormatter();
        using (var ms = new MemoryStream())
        {
            bf.Serialize(ms, codebook);
            ms.Seek(0, SeekOrigin.Begin);
            object test = bf.Deserialize(ms);    //Exception thrown here
        }

【问题讨论】：

标签： c# accord.net

【解决方案1】：

该代码对我来说运行良好 - 看起来像 the problem was fixed in 3.3.0

【讨论】：