IObjectReference Interface

Indicates that the current interface implementer is a reference to another object.

Namespace:  System.Runtime.Serialization
Assembly:  mscorlib (in mscorlib.dll)

public interface IObjectReference

Notes to Implementers:

Implement this interface on objects that are references to a different object, which cannot be resolved until the current object is completely restored. During the fixup stage, any object implementing IObjectReference is queried for its real object and that object is inserted into the graph. Fixup refers to the process of finalizing references not already completed during the object deserialization process.

No code example is currently available or this language may not be supported.
#using <mscorlib.dll>
#using <System.dll>
#using <System.Web.dll>

using namespace System;
using namespace System::Web;
using namespace System::IO;
using namespace System::Collections;
using namespace System::Runtime::Serialization::Formatters::Binary;
using namespace System::Runtime::Serialization;
using namespace System::Security::Permissions;


private __sealed __gc class SingletonSerializationHelper;

// There should be only one instance of this type per AppDomain.
[Serializable]
[AspNetHostingPermission(SecurityAction::LinkDemand, 
   Level=AspNetHostingPermissionLevel::Minimal)]
public __gc __sealed class Singleton : public ISerializable 
{
	// This is the one instance of this type.
private:
	static Singleton* theOneObject = new Singleton();

	// Here are the instance fields.
public:
	String* someString;
	Int32 someNumber;

	// Private constructor allowing this type to construct the singleton.
private:
	Singleton() 
	{ 
		// Do whatever is necessary to initialize the singleton.
		someString = S"This is a String* field";
		someNumber = 123;
	}

	// A method returning a reference to the singleton.
public:
	static Singleton* GetSingleton() 
	{ 
		return theOneObject; 
	}

	// A method called when serializing a Singleton.
	void GetObjectData(SerializationInfo* info, StreamingContext context) 
	{
		// Instead of serializing this Object*, we will  
		// serialize a SingletonSerializationHelp instead.
		info->SetType(__typeof(SingletonSerializationHelper));
		// No other values need to be added.
	}

	// NOTE: ISerializable*'s special constructor is NOT necessary 
	// because it's never called
};

[Serializable]
[AspNetHostingPermission(SecurityAction::LinkDemand, 
    Level=AspNetHostingPermissionLevel::Minimal)]
private __gc __sealed class SingletonSerializationHelper : public IObjectReference 
	{
		// This Object* has no fields (although it could).
		// GetRealObject is called after this Object* is deserialized
	public:
		Object* GetRealObject(StreamingContext context) 
		{
			// When deserialiing this Object*, return a reference to 
			// the singleton Object* instead.
			return Singleton::GetSingleton();
		}
	};

[STAThread]
int main() 
{
	FileStream* fs = new FileStream(S"DataFile.dat", FileMode::Create);

	try 
	{
		// Construct a BinaryFormatter and use it 
		// to serialize the data to the stream.
		BinaryFormatter* formatter = new BinaryFormatter();

		// Create an array with multiple elements refering to 
		// the one Singleton Object*.
		Singleton* a1[] = { Singleton::GetSingleton(), Singleton::GetSingleton() };

		// This displays S"True".
		Console::WriteLine(S"Do both array elements refer to the same Object? {0}", __box((a1->Item[0] == a1->Item[1])));

		// Serialize the array elements.
		formatter->Serialize(fs, a1);

		// Deserialize the array elements.
		fs->Position = 0;
		Singleton* a2[] = (Singleton* __gc[]) formatter->Deserialize(fs);

		// This displays S"True".
		Console::WriteLine(S"Do both array elements refer to the same Object? {0}", __box((a2->Item[0] == a2->Item[1]))); 

		// This displays S"True".
		Console::WriteLine(S"Do all  array elements refer to the same Object? {0}", __box((a1->Item[0] == a2->Item[0])));
	} 
	catch (SerializationException* e) 
	{
		Console::WriteLine(S"Failed to serialize. Reason: {0}", e->Message);
		throw;
	}
	__finally 
	{
		fs->Close();
	}
	return 0;
}

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0
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