IObjectReference インターフェイス
現在のインターフェイス インプリメンタが別のオブジェクトへの参照であることを示します。
名前空間: System.Runtime.Serialization
アセンブリ: mscorlib (mscorlib.dll 内)
構文
解説
使用例
プラットフォーム
バージョン情報
参照
アセンブリ: mscorlib (mscorlib.dll 内)
構文解説
実装時の注意
異なるオブジェクトへの参照であるオブジェクトに、このインターフェイスを実装します。この参照は、現在のオブジェクトが完全に復元されるまで解決できません。フィックスアップ段階で、IObjectReference を実装する任意のオブジェクトにその実際のオブジェクトを照会し、そのオブジェクトがグラフに挿入されます。フィックスアップは、オブジェクトの逆シリアル化プロセスで完了していない参照を完了させるプロセスを指します。
使用例Imports System Imports System.Web Imports System.IO Imports System.Collections Imports System.Runtime.Serialization.Formatters.Binary Imports System.Runtime.Serialization Imports System.Security.Permissions ' There should be only one instance of this type per AppDomain. <Serializable()> _ <PermissionSet(SecurityAction.Demand, Name:="FullTrust")> _ Public NotInheritable Class Singleton Implements ISerializable ' This is the one instance of this type. Private Shared ReadOnly theOneObject As New Singleton ' Here are the instance fields. Private someString As String private someNumber As Int32 ' Private constructor allowing this type to construct the Singleton. Private Sub New() ' Do whatever is necessary to initialize the Singleton. someString = "This is a string field" someNumber = 123 End Sub ' A method returning a reference to the Singleton. Public Shared Function GetSingleton() As Singleton Return theOneObject End Function ' A method called when serializing a Singleton. <SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags:=SecurityPermissionFlag.SerializationFormatter)> _ Private Sub GetObjectData(ByVal info As SerializationInfo, _ ByVal context As StreamingContext) _ Implements ISerializable.GetObjectData ' Instead of serializing this object, we will ' serialize a SingletonSerializationHelp instead. info.SetType(GetType(SingletonSerializationHelper)) ' No other values need to be added. End Sub ' Note: ISerializable's special constructor is not necessary ' because it is never called. End Class <Serializable()> _ <PermissionSet(SecurityAction.Demand, Name:="FullTrust")> _ Friend NotInheritable Class SingletonSerializationHelper Implements IObjectReference ' This object has no fields (although it could). ' GetRealObject is called after this object is deserialized. <SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags:=SecurityPermissionFlag.SerializationFormatter)> _ Public Function GetRealObject(ByVal context As StreamingContext) As Object Implements IObjectReference.GetRealObject ' When deserialiing this object, return a reference to ' the Singleton object instead. Return Singleton.GetSingleton() End Function End Class Class App <STAThread()> Shared Sub Main() Dim fs As New FileStream("DataFile.dat", FileMode.Create) Try ' Construct a BinaryFormatter and use it ' to serialize the data to the stream. Dim formatter As New BinaryFormatter ' Create an array with multiple elements refering to ' the one Singleton object. Dim a1() As Singleton = {Singleton.GetSingleton(), Singleton.GetSingleton()} ' This displays "True". Console.WriteLine("Do both array elements refer to the same object? " & _ Object.ReferenceEquals(a1(0), a1(1))) ' Serialize the array elements. formatter.Serialize(fs, a1) ' Deserialize the array elements. fs.Position = 0 Dim a2() As Singleton = DirectCast(formatter.Deserialize(fs), Singleton()) ' This displays "True". Console.WriteLine("Do both array elements refer to the same object? " & _ Object.ReferenceEquals(a2(0), a2(1))) ' This displays "True". Console.WriteLine("Do all array elements refer to the same object? " & _ Object.ReferenceEquals(a1(0), a2(0))) Catch e As SerializationException Console.WriteLine("Failed to serialize. Reason: " & e.Message) Throw Finally fs.Close() End Try End Sub End Class
using System; using System.Web; using System.IO; using System.Collections; using System.Runtime.Serialization.Formatters.Binary; using System.Runtime.Serialization; using System.Security.Permissions; // There should be only one instance of this type per AppDomain. [Serializable] [PermissionSet(SecurityAction.Demand, Name="FullTrust")] [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] public sealed class Singleton : ISerializable { // This is the one instance of this type. private static readonly Singleton theOneObject = new Singleton(); // Here are the instance fields. private string someString_value; private Int32 someNumber_value; public string SomeString { get{return someString_value;} set{someString_value = value;} } public Int32 SomeNumber { get{return someNumber_value;} set{someNumber_value = value;} } // Private constructor allowing this type to construct the Singleton. private Singleton() { // Do whatever is necessary to initialize the Singleton. someString_value = "This is a string field"; someNumber_value = 123; } // A method returning a reference to the Singleton. public static Singleton GetSingleton() { return theOneObject; } // A method called when serializing a Singleton. [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.SerializationFormatter)] void ISerializable.GetObjectData( SerializationInfo info, StreamingContext context) { // Instead of serializing this object, // 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 is never called. } [Serializable] [PermissionSet(SecurityAction.Demand, Name="FullTrust")] [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.SerializationFormatter)] [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] internal sealed class SingletonSerializationHelper : 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(); } } class App { [STAThread] static void Main() { FileStream fs = new FileStream("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 "True". Console.WriteLine( "Do both array elements refer to the same object? " + (a1[0] == a1[1])); // Serialize the array elements. formatter.Serialize(fs, a1); // Deserialize the array elements. fs.Position = 0; Singleton[] a2 = (Singleton[]) formatter.Deserialize(fs); // This displays "True". Console.WriteLine("Do both array elements refer to the same object? " + (a2[0] == a2[1])); // This displays "True". Console.WriteLine("Do all array elements refer to the same object? " + (a1[0] == a2[0])); } catch (SerializationException e) { Console.WriteLine("Failed to serialize. Reason: " + e.Message); throw; } finally { fs.Close(); } } }
using namespace System; using namespace System::IO; using namespace System::Collections; using namespace System::Runtime::Serialization::Formatters::Binary; using namespace System::Runtime::Serialization; ref class SingletonSerializationHelper; // There should be only one instance of this type per AppDomain. [Serializable] public ref class Singleton sealed: public ISerializable { private: // This is the one instance of this type. static Singleton^ theOneObject = gcnew Singleton; public: // Here are the instance fields. String^ someString; Int32 someNumber; private: // Private constructor allowing this type to construct the singleton. Singleton() { // Do whatever is necessary to initialize the singleton. someString = "This is a String* field"; someNumber = 123; } public: // A method returning a reference to the singleton. static Singleton^ GetSingleton() { return theOneObject; } // A method called when serializing a Singleton. [System::Security::Permissions::SecurityPermissionAttribute (System::Security::Permissions::SecurityAction::LinkDemand, Flags=System::Security::Permissions::SecurityPermissionFlag::SerializationFormatter)] virtual void GetObjectData( SerializationInfo^ info, StreamingContext context ) { // Instead of serializing this Object*, we will // serialize a SingletonSerializationHelp instead. info->SetType( SingletonSerializationHelper::typeid ); // No other values need to be added. } // NOTE: ISerializable*'s special constructor is NOT necessary // because it's never called }; [Serializable] private ref class SingletonSerializationHelper sealed: public IObjectReference { public: // This Object* has no fields (although it could). // GetRealObject is called after this Object* is deserialized virtual Object^ GetRealObject( StreamingContext context ) { // When deserialiing this Object*, return a reference to // the singleton Object* instead. return Singleton::GetSingleton(); } }; [STAThread] int main() { FileStream^ fs = gcnew FileStream( "DataFile.dat",FileMode::Create ); try { // Construct a BinaryFormatter and use it // to serialize the data to the stream. BinaryFormatter^ formatter = gcnew BinaryFormatter; // Create an array with multiple elements refering to // the one Singleton Object*. array<Singleton^>^a1 = {Singleton::GetSingleton(),Singleton::GetSingleton()}; // This displays S"True". Console::WriteLine( "Do both array elements refer to the same Object? {0}", (a1[ 0 ] == a1[ 1 ]) ); // Serialize the array elements. formatter->Serialize( fs, a1 ); // Deserialize the array elements. fs->Position = 0; array<Singleton^>^a2 = (array<Singleton^>^)formatter->Deserialize( fs ); // This displays S"True". Console::WriteLine( "Do both array elements refer to the same Object? {0}", (a2[ 0 ] == a2[ 1 ]) ); // This displays S"True". Console::WriteLine( "Do all array elements refer to the same Object? {0}", (a1[ 0 ] == a2[ 0 ]) ); } catch ( SerializationException^ e ) { Console::WriteLine( "Failed to serialize. Reason: {0}", e->Message ); throw; } finally { fs->Close(); } return 0; }
プラットフォームWindows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。
バージョン情報参照IObjectReference メソッド
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IObjectReference メンバ
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