Question

Case:

Pass a unserializable parameter cross AppDomain.

Following is some method which i want to call in remote domain;

public RemoteClass
{
  public Test(Class1 obj);
  public Test(List<Class1> obj);
}

Define:

Class1    :   un-serializable

[Serializable]
Class2 : Class1  , ISerializable  //mark Class2 serializable
{
    //.....
}

Following code used to test:

using (MemoryStream s = new MemoryStream())
{
    BinaryFormatter f = new BinaryFormatter();
    f.Serialize(s, obj);
}

Test result:

obj                                      result

Class1 obj=new Class1();                 exception

Class1 obj=new Class2();                 success

List<Class1> obj=new List<Class1);       exception  when obj contain some element;
obj.Add(new Class1();   

List<Class1> obj=new List<Class1);       exception  when obj contain some element; //how???
obj.Add(new Class2();

List<Class2> obj=new List<Class2);       success;
obj.Add(new Class2();   

Class1 is not a serializable calss, and I cannot modify it, so I have define Class2 which inherits from Class1 and implements ISerializable. I can pass an instance of Class2 when a method needs a instance of Class1 in test result and this solution is successful, however for List<Class1> this does not work.

Answer 1

How about converting the List<Class1> instance into a list List<Class2> (the following should work as long as you declare a suitable constructor on Class2):

// using System.Linq;
List<Class1> inputList = MyInputList();
List<Class2> outputList = inputList.ConvertAll<Class2>(a => new Class2(a));

You should then be able to serialise List<Class2> just fine.

You find that you need to convert your serialised list back into a List<Class> before you can use it anywhere that accepts a List<Class1> – a variation on the above should work just as well in reverse.