在序列化时，我犯了什么错误？

这导致了运行时的序列化异常。这只是一个测试最佳实践的演示项目。我包含了主方法和我试图序列化的类。\n忽略：我真的不能提供更多细节了，我已经描述了问题，附上了代码，这个“请提供更多细节”的要求真是最愚蠢的事情。让我发布吧。\n

Data toSend = new Data();
toSend.Output();
///序列化
BinaryFormatter formatter = new BinaryFormatter();
Stream streamOut = File.OpenWrite("file");
formatter.Serialize(streamOut, toSend);
streamOut.Close();
Console.WriteLine("----------------------------");
///反序列化
Stream streamIn = File.OpenRead("file");
Object received = formatter.Deserialize(streamIn);
Data toReceive = (Data)received;
toReceive.Output();
class Data : ISerializable
{
    int integerData;
    string stringData;
    bool booleanData;
    int shouldnotbeserialized;
    public Data()
    {
        integerData = 1;
        stringData = "Hello";
        booleanData = true;
        shouldnotbeserialized = 55;
    }
    //用于反序列化
    public Data(SerializationInfo info, StreamingContext context)
    {
        integerData = info.GetInt32("theint");
        stringData = info.GetString("thestring");
        booleanData = info.GetBoolean("thebool");
    }
    public void Output()
    {
        Console.WriteLine(integerData);
        Console.WriteLine(stringData);
        Console.WriteLine(booleanData);
        Console.WriteLine(shouldnotbeserialized);
    }
    //实现的序列化方法
    public void GetObjectData(SerializationInfo info, StreamingContext context)
    {
        info.AddValue("thestring", stringData);
        info.AddValue("theint", integerData);
        info.AddValue("thebool", booleanData);
    }
}

\n异常消息：\n

\n程序集“SerializationDemo”中的类型“SerializationDemo.Data”未标记为可序列化。\n