条件C＃二进制序列化

Question

I am using BinaryFormatter to serialize a class and its variables by condition. For example:

[Serializable]
public class Class1
{
private Class2 B;
...
}

[Serializable]
public class Class2{...}

I want the variable B to be serialized only when remoting time, but not when i serialize it to file storage. Questions:
1) I know that in XmlSerialization we can use [XmlIgnore] and {PropertyName}Specified to ignore the property conditionally. Is that a equivalent method for [NonSerialized]?
2) For a class with [Serializable] attribute, how to ignore it at the runtime?

Answer 1

I wrote a rather simple but extensible framework to solve this sort of problem using bindings. Not sure I completely understand but this is possible:

public class Class1
{
  [Ignore]
  public bool IsRemoting { get; set; }

  [SerializeWhen("IsRemoting", true)]
  public Class2 B;
}

http://binaryserializer.codeplex.com

Answer 2

1. There is no such method. You can control serialization by implementing ISerializable , and if you do you will know which serialization context is active (remoting, file etc.)
2. AFAIK no way to do it, why do you want this?

Generally speaking I advise you against using BinaryFormatter . It is a maintenance headache if there ever was one. Use XML serialization or some kind of protocol buffers.

Answer 3

1. As already mentioned, it doesn't exist. You could code your way out of although it is a bit messy (that is if you don't want to implement the ISerializable interface as already suggested).

    [Serializable] public class ClassA { [OnSerializing] private void OnSerializing(StreamingContext context) { //Set BSerialized = B based on context or some internal boolean BSerialized = B; } [OnSerialized] private void OnSerialized(StreamingContext context) { //Clear BSerialized BSerialized = null; } [OnDeserialized] private void OnDeserialized(StreamingContext context) { //Restore B from BSerialized B = BSerialized; BSerialized = null; } [NonSerialized] private ClassB B; private ClassB BSerialized; } [Serializable] public class ClassB { } 

2. You can't ignore it. You can only change properties on attributes at runtime and since the NonSerialized attribute doesn't take a true / false argument, you cannot do anything about it runtime.