[Serializable]
internal class Class1Upgrader
{
  public BinaryFormatter CreateFormatter()
  {
     BinaryFormatter binaryFormatter = new BinaryFormatter();
     SurrogateSelector selector = new SurrogateSelector();
     selector.AddSurrogate(typeof(Project2.Class1), new StreamingContext(StreamingContextStates.All), new Class1Surrogate());
     selector.AddSurrogate(typeof(Project1.Class2), new StreamingContext(StreamingContextStates.All), new Class2Surrogate());
     binaryFormatter.SurrogateSelector = selector;
     binaryFormatter.Binder = new Class1Binder();
     return binaryFormatter;
  }
}

[Serializable]
internal class Class1Binder : SerializationBinder
{
  public override Type BindToType(string assemblyName, string typeName)
  {
    if (typeName.Contains("System.Collections.Generic.List`1[[Project1.Class1, Class1"))
    {
       return typeof(List<Project2.Class1>);
    }
    if (typeName == typeof(Project1.Class1).FullName)
    {
       return typeof(Project2.Class1);
    }
    return null;
  }
}

internal class Class1Surrogate : ISerializationSurrogate
{
   public object SetObjectData(object obj, SerializationInfo info, StreamingContext context, ISurrogateSelector selector)
   {
     Project2.Class1 result = (Project2.Class1)obj;
     //Handle the logic here to convert your old properties into your new one
     return result;
   }
   public void GetObjectData(object obj, SerializationInfo info, StreamingContext context)
   {
     throw new NotImplementedException();
   }
}

internal class Class2Surrogate : ISerializationSurrogate
{
   public object SetObjectData(object obj, SerializationInfo info, StreamingContext context, ISurrogateSelector selector)
   {
     Project2.Class1 result = new Project2.Class1();
     //Handle the logic here to convert your old properties into your new one
     return result;
   }
   public void GetObjectData(object obj, SerializationInfo info, StreamingContext context)
   {
     throw new NotImplementedException();
   }
}

因此，解决方案是更改绑定以返回新对象，而不是通过代理传递旧对象。这在处理要升级的对象列表时非常重要。因此，在代理类中添加typeof（project2.class1）将处理属性的转换。因此，在您的setobjectdata中，对象中的代理项将是typeof（project2.class1），如上面在classsurrogate中所示。