StreamingContextStates Enumeration

Definition

Definiert einen Satz von Flags, der den Quell- oder Zielkontext für den Datenstrom während der Serialisierung angibt.Defines a set of flags that specifies the source or destination context for the stream during serialization.

Diese Enumeration weist ein FlagsAttribute-Attribut auf, die eine bitweise Kombination der Memberwerte zulässt.

public enum class StreamingContextStates
[System.Flags]
[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public enum StreamingContextStates
type StreamingContextStates = 
Public Enum StreamingContextStates
Vererbung
StreamingContextStates
Attribute

Felder

All 255

Gibt an, dass die serialisierten Daten zu einem beliebigen anderen Kontext übertragen oder von dort empfangen werden können.Specifies that the serialized data can be transmitted to or received from any of the other contexts.

Clone 64

Gibt an, dass das Objektdiagramm gerade geklont wird.Specifies that the object graph is being cloned. Benutzer können davon ausgehen, dass das geklonte Diagramm weiterhin in dem gleichen Prozess vorhanden sein wird, und sicher auf Handles bzw. andere Verweise auf nicht verwaltete Ressourcen zugreifen.Users can assume that the cloned graph will continue to exist within the same process and be safe to access handles or other references to unmanaged resources.

CrossAppDomain 128

Gibt an, dass der Quell- oder Zielkontext eine andere AppDomain ist.Specifies that the source or destination context is a different AppDomain. (Eine Beschreibung von AppDomains finden Sie unter Anwendungsdomänen).(For a description of AppDomains, see Application Domains).

CrossMachine 2

Gibt an, dass der Quell- oder Zielkontext ein anderer Computer ist.Specifies that the source or destination context is a different computer.

CrossProcess 1

Gibt an, dass der Quell- oder Zielkontext ein anderer Prozess auf dem gleichen Computer ist.Specifies that the source or destination context is a different process on the same computer.

File 4

Gibt an, dass der Quell- oder Zielkontext eine Datei ist.Specifies that the source or destination context is a file. Benutzer können davon ausgehen, dass Dateien länger vorhanden sind als der Prozess, der sie erstellt hat, und sollten Objekte nicht so serialisieren, dass die Deserialisierung den Zugriff auf Daten aus dem aktuellen Prozess voraussetzt.Users can assume that files will last longer than the process that created them and not serialize objects in such a way that deserialization will require accessing any data from the current process.

Other 32

Gibt an, dass der Serialisierungskontext unbekannt ist.Specifies that the serialization context is unknown.

Persistence 8

Gibt an, dass der Quell- oder Zielkontext ein permanenter Speicher ist, was Datenbanken, Dateien oder andere Sicherungsspeicher umfasst.Specifies that the source or destination context is a persisted store, which could include databases, files, or other backing stores. Benutzer können davon ausgehen, dass permanente Daten länger vorhanden sind als der Prozess, der sie erstellt hat, und sollten Objekte nicht so serialisieren, dass die Deserialisierung den Zugriff auf Daten aus dem aktuellen Prozess voraussetzt.Users can assume that persisted data will last longer than the process that created the data and not serialize objects so that deserialization will require accessing any data from the current process.

Remoting 16

Gibt an, dass die Daten remote in einem Kontext an einem unbekannten Speicherort gespeichert werden.Specifies that the data is remoted to a context in an unknown location. Benutzer haben keinen Aufschluss darüber, ob dies auf dem gleichen Computer stattfindet.Users cannot make any assumptions whether this is on the same computer.

Beispiele

Im folgenden Codebeispiel wird die Verwendung StreamingContextStates der-Aufzählung veranschaulicht.The following code example demonstrates the use of the StreamingContextStates enum.

// Note: You must compile this file using the C# /unsafe switch.
using System;
using System.IO;
using System.Collections;
using System.Runtime.Serialization.Formatters.Binary;
using System.Runtime.Serialization;
using System.Runtime.InteropServices;
using System.Security.Permissions;

[assembly: SecurityPermission(
SecurityAction.RequestMinimum, Execution = true)]
// This class includes several Win32 interop definitions.
internal class Win32
{
    public static readonly IntPtr InvalidHandleValue = new IntPtr(-1);
    public const UInt32 FILE_MAP_WRITE = 2;
    public const UInt32 PAGE_READWRITE = 0x04;

    [DllImport("Kernel32",CharSet=CharSet.Unicode)]
    public static extern IntPtr CreateFileMapping(IntPtr hFile,
        IntPtr pAttributes, UInt32 flProtect,
        UInt32 dwMaximumSizeHigh, UInt32 dwMaximumSizeLow, String pName);

    [DllImport("Kernel32",CharSet=CharSet.Unicode)]
    public static extern IntPtr OpenFileMapping(UInt32 dwDesiredAccess,
        Boolean bInheritHandle, String name);

    [DllImport("Kernel32",CharSet=CharSet.Unicode)]
    public static extern Boolean CloseHandle(IntPtr handle);

    [DllImport("Kernel32",CharSet=CharSet.Unicode)]
    public static extern IntPtr MapViewOfFile(IntPtr hFileMappingObject,
        UInt32 dwDesiredAccess,
        UInt32 dwFileOffsetHigh, UInt32 dwFileOffsetLow,
        IntPtr dwNumberOfBytesToMap);

    [DllImport("Kernel32",CharSet=CharSet.Unicode)]
    public static extern Boolean UnmapViewOfFile(IntPtr address);

    [DllImport("Kernel32",CharSet=CharSet.Unicode)]
    public static extern Boolean DuplicateHandle(IntPtr hSourceProcessHandle,
        IntPtr hSourceHandle,
        IntPtr hTargetProcessHandle, ref IntPtr lpTargetHandle,
        UInt32 dwDesiredAccess, Boolean bInheritHandle, UInt32 dwOptions);
    public const UInt32 DUPLICATE_CLOSE_SOURCE = 0x00000001;
    public const UInt32 DUPLICATE_SAME_ACCESS = 0x00000002;

    [DllImport("Kernel32",CharSet=CharSet.Unicode)]
    public static extern IntPtr GetCurrentProcess();
}


// This class wraps memory that can be simultaneously 
// shared by multiple AppDomains and Processes.
[Serializable]
public sealed class SharedMemory : ISerializable, IDisposable
{
    // The handle and string that identify 
    // the Windows file-mapping object.
    private IntPtr m_hFileMap = IntPtr.Zero;
    private String m_name;

    // The address of the memory-mapped file-mapping object.
    private IntPtr m_address;

    public unsafe Byte* Address
    {
        get { return (Byte*)m_address; }
    }

    // The constructors.
    public SharedMemory(Int32 size) : this(size, null) { }

    public SharedMemory(Int32 size, String name)
    {
        m_hFileMap = Win32.CreateFileMapping(Win32.InvalidHandleValue,
            IntPtr.Zero, Win32.PAGE_READWRITE,
            0, unchecked((UInt32)size), name);
        if (m_hFileMap == IntPtr.Zero)
            throw new Exception("Could not create memory-mapped file.");
        m_name = name;
        m_address = Win32.MapViewOfFile(m_hFileMap, Win32.FILE_MAP_WRITE,
            0, 0, IntPtr.Zero);
    }

    // The cleanup methods.
    public void Dispose()
    {
        GC.SuppressFinalize(this);
        Dispose(true);
    }

    private void Dispose(Boolean disposing)
    {
        Win32.UnmapViewOfFile(m_address);
        Win32.CloseHandle(m_hFileMap);
        m_address = IntPtr.Zero;
        m_hFileMap = IntPtr.Zero;
    }

    ~SharedMemory()
    {
        Dispose(false);
    }

    // Private helper methods.
    private static Boolean AllFlagsSet(Int32 flags, Int32 flagsToTest)
    {
        return (flags & flagsToTest) == flagsToTest;
    }

    private static Boolean AnyFlagsSet(Int32 flags, Int32 flagsToTest)
    {
        return (flags & flagsToTest) != 0;
    }


    // The security attribute demands that code that calls  
    // this method have permission to perform serialization.
    [SecurityPermissionAttribute(SecurityAction.Demand, SerializationFormatter = true)]
    void ISerializable.GetObjectData(SerializationInfo info, StreamingContext context)
    {
        // The context's State member indicates
        // where the object will be deserialized.

        // A SharedMemory object cannot be serialized 
        // to any of the following destinations.
        const StreamingContextStates InvalidDestinations =
                  StreamingContextStates.CrossMachine |
                  StreamingContextStates.File |
                  StreamingContextStates.Other |
                  StreamingContextStates.Persistence |
                  StreamingContextStates.Remoting;
        if (AnyFlagsSet((Int32)context.State, (Int32)InvalidDestinations))
            throw new SerializationException("The SharedMemory object " +
                "cannot be serialized to any of the following streaming contexts: " +
                InvalidDestinations);

        const StreamingContextStates DeserializableByHandle =
                  StreamingContextStates.Clone |
            // The same process.
                  StreamingContextStates.CrossAppDomain;
        if (AnyFlagsSet((Int32)context.State, (Int32)DeserializableByHandle))
            info.AddValue("hFileMap", m_hFileMap);

        const StreamingContextStates DeserializableByName =
            // The same computer.
                  StreamingContextStates.CrossProcess;
        if (AnyFlagsSet((Int32)context.State, (Int32)DeserializableByName))
        {
            if (m_name == null)
                throw new SerializationException("The SharedMemory object " +
                    "cannot be serialized CrossProcess because it was not constructed " +
                    "with a String name.");
            info.AddValue("name", m_name);
        }
    }


    // The security attribute demands that code that calls  
    // this method have permission to perform serialization.
    [SecurityPermissionAttribute(SecurityAction.Demand, SerializationFormatter = true)]
    private SharedMemory(SerializationInfo info, StreamingContext context)
    {
        // The context's State member indicates 
        // where the object was serialized from.

        const StreamingContextStates InvalidSources =
                  StreamingContextStates.CrossMachine |
                  StreamingContextStates.File |
                  StreamingContextStates.Other |
                  StreamingContextStates.Persistence |
                  StreamingContextStates.Remoting;
        if (AnyFlagsSet((Int32)context.State, (Int32)InvalidSources))
            throw new SerializationException("The SharedMemory object " +
                "cannot be deserialized from any of the following stream contexts: " +
                InvalidSources);

        const StreamingContextStates SerializedByHandle =
                  StreamingContextStates.Clone |
            // The same process.
                  StreamingContextStates.CrossAppDomain;
        if (AnyFlagsSet((Int32)context.State, (Int32)SerializedByHandle))
        {
            try
            {
                Win32.DuplicateHandle(Win32.GetCurrentProcess(),
                    (IntPtr)info.GetValue("hFileMap", typeof(IntPtr)),
                    Win32.GetCurrentProcess(), ref m_hFileMap, 0, false,
                    Win32.DUPLICATE_SAME_ACCESS);
            }
            catch (SerializationException)
            {
                throw new SerializationException("A SharedMemory was not serialized " +
                    "using any of the following streaming contexts: " +
                    SerializedByHandle);
            }
        }

        const StreamingContextStates SerializedByName =
            // The same computer.
                  StreamingContextStates.CrossProcess;
        if (AnyFlagsSet((Int32)context.State, (Int32)SerializedByName))
        {
            try
            {
                m_name = info.GetString("name");
            }
            catch (SerializationException)
            {
                throw new SerializationException("A SharedMemory object was not " +
                    "serialized using any of the following streaming contexts: " +
                    SerializedByName);
            }
            m_hFileMap = Win32.OpenFileMapping(Win32.FILE_MAP_WRITE, false, m_name);
        }
        if (m_hFileMap != IntPtr.Zero)
        {
            m_address = Win32.MapViewOfFile(m_hFileMap, Win32.FILE_MAP_WRITE,
                0, 0, IntPtr.Zero);
        }
        else
        {
            throw new SerializationException("A SharedMemory object could not " +
                "be deserialized.");
        }
    }
}


class App
{
    [STAThread]
    static void Main(string[] args)
    {
        Serialize();
        Console.WriteLine();
        Deserialize();
    }

    unsafe static void Serialize()
    {
        // Create a hashtable of values that will eventually be serialized.
        SharedMemory sm = new SharedMemory(1024, "JeffMemory");
        for (Int32 x = 0; x < 100; x++)
            *(sm.Address + x) = (Byte)x;

        Byte[] b = new Byte[10];
        for (Int32 x = 0; x < b.Length; x++) b[x] = *(sm.Address + x);
        Console.WriteLine(BitConverter.ToString(b));

        // To serialize the SharedMemory object, 
        // you must first open a stream for writing. 
        // Use a file stream here.
        FileStream fs = new FileStream("DataFile.dat", FileMode.Create);

        // Construct a BinaryFormatter and tell it where 
        // the objects will be serialized to.
        BinaryFormatter formatter = new BinaryFormatter(null,
            new StreamingContext(StreamingContextStates.CrossAppDomain));
        try
        {
            formatter.Serialize(fs, sm);
        }
        catch (SerializationException e)
        {
            Console.WriteLine("Failed to serialize. Reason: " + e.Message);
            throw;
        }
        finally
        {
            fs.Close();
        }
    }


    unsafe static void Deserialize()
    {
        // Declare a SharedMemory reference.
        SharedMemory sm = null;

        // Open the file containing the data that you want to deserialize.
        FileStream fs = new FileStream("DataFile.dat", FileMode.Open);
        try
        {
            BinaryFormatter formatter = new BinaryFormatter(null,
                new StreamingContext(StreamingContextStates.CrossAppDomain));

            // Deserialize the SharedMemory object from the file and 
            // assign the reference to the local variable.
            sm = (SharedMemory)formatter.Deserialize(fs);
        }
        catch (SerializationException e)
        {
            Console.WriteLine("Failed to deserialize. Reason: " + e.Message);
            throw;
        }
        finally
        {
            fs.Close();
        }

        // To prove that the SharedMemory object deserialized correctly, 
        // display some of its bytes to the console.
        Byte[] b = new Byte[10];
        for (Int32 x = 0; x < b.Length; x++) b[x] = *(sm.Address + x);
        Console.WriteLine(BitConverter.ToString(b));
    }
}
Imports System.IO
Imports System.Collections
Imports System.Runtime.Serialization.Formatters.Binary
Imports System.Runtime.Serialization
Imports System.Runtime.InteropServices
Imports System.Security.Permissions

<Assembly: SecurityPermission( _
SecurityAction.RequestMinimum, Execution:=True)> 
' This class includes several Win32 interop definitions.
Friend Class Win32
    Public Shared ReadOnly InvalidHandleValue As New IntPtr(-1)
    Public Const FILE_MAP_WRITE As Int32 = 2
    Public Const PAGE_READWRITE As Int32 = &H4

    <DllImport("Kernel32", CharSet:=CharSet.Unicode)> _
    Public Shared Function CreateFileMapping(ByVal hFile As IntPtr, _
                                             ByVal pAttributes As IntPtr, _
                                             ByVal flProtect As Int32, _
                                             ByVal dwMaximumSizeHigh As Int32, _
                                             ByVal dwMaximumSizeLow As Int32, _
                                             ByVal pName As String) As IntPtr
    End Function

    <DllImport("Kernel32", CharSet:=CharSet.Unicode)> _
    Public Shared Function OpenFileMapping(ByVal dwDesiredAccess As Int32, _
                                           ByVal bInheritHandle As Boolean, _
                                           ByVal name As String) As IntPtr
    End Function

    <DllImport("Kernel32", CharSet:=CharSet.Unicode)> _
    Public Shared Function CloseHandle(ByVal handle As IntPtr) As Boolean
    End Function

    <DllImport("Kernel32", CharSet:=CharSet.Unicode)> _
    Public Shared Function MapViewOfFile(ByVal hFileMappingObject As IntPtr, _
                                         ByVal dwDesiredAccess As Int32, _
                                         ByVal dwFileOffsetHigh As Int32, _
                                         ByVal dwFileOffsetLow As Int32, _
                                         ByVal dwNumberOfBytesToMap As IntPtr) _
                                         As IntPtr
    End Function

    <DllImport("Kernel32", CharSet:=CharSet.Unicode)> _
    Public Shared Function UnmapViewOfFile(ByVal address As IntPtr) As Boolean
    End Function

    <DllImport("Kernel32", CharSet:=CharSet.Unicode)> _
    Public Shared Function DuplicateHandle(ByVal hSourceProcessHandle As IntPtr, _
                                           ByVal hSourceHandle As IntPtr, _
                                           ByVal hTargetProcessHandle As IntPtr, _
                                           ByRef lpTargetHandle As IntPtr, _
                                           ByVal dwDesiredAccess As Int32, _
                                           ByVal bInheritHandle As Boolean, _
                                           ByVal dwOptions As Int32) As Boolean
    End Function

    Public Const DUPLICATE_CLOSE_SOURCE As Int32 = &H1
    Public Const DUPLICATE_SAME_ACCESS As Int32 = &H2

    <DllImport("Kernel32", CharSet:=CharSet.Unicode)> Public Shared Function GetCurrentProcess() As IntPtr
    End Function
End Class


' This class wraps memory that can be simultaneously 
' shared by multiple AppDomains and Processes.
<Serializable()> Public NotInheritable Class SharedMemory
    Implements ISerializable
    Implements IDisposable

    ' The handle and string that identify 
    ' the Windows file-mapping object.
    Private m_hFileMap As IntPtr = IntPtr.Zero
    Private m_name As String

    ' The address of the memory-mapped file-mapping object.
    Private m_address As IntPtr
    <SecurityPermissionAttribute(SecurityAction.LinkDemand, _
    Flags:=SecurityPermissionFlag.UnmanagedCode)> _
    Public Function GetByte(ByVal offset As Int32) As Byte
        Dim b(0) As Byte
        Marshal.Copy(New IntPtr(m_address.ToInt64() + offset), b, 0, 1)
        Return b(0)
    End Function

    <SecurityPermissionAttribute(SecurityAction.LinkDemand, _
    Flags:=SecurityPermissionFlag.UnmanagedCode)> _
    Public Sub SetByte(ByVal offset As Int32, ByVal value As Byte)
        Dim b(0) As Byte
        b(0) = value
        Marshal.Copy(b, 0, New IntPtr(m_address.ToInt64() + offset), 1)
    End Sub


    ' The constructors.
    Public Sub New(ByVal size As Int32)
        Me.New(size, Nothing)
    End Sub

    Public Sub New(ByVal size As Int32, ByVal name As String)
        m_hFileMap = Win32.CreateFileMapping(Win32.InvalidHandleValue, _
           IntPtr.Zero, Win32.PAGE_READWRITE, 0, size, name)
        If (m_hFileMap.Equals(IntPtr.Zero)) Then _
           Throw New Exception("Could not create memory-mapped file.")
        m_name = name
        m_address = Win32.MapViewOfFile(m_hFileMap, _
           Win32.FILE_MAP_WRITE, 0, 0, IntPtr.Zero)
    End Sub


    ' The cleanup methods.
    Public Sub Dispose() Implements IDisposable.Dispose
        GC.SuppressFinalize(Me)
        Dispose(True)
    End Sub

    Private Sub Dispose(ByVal disposing As Boolean)
        Win32.UnmapViewOfFile(m_address)
        Win32.CloseHandle(m_hFileMap)
        m_address = IntPtr.Zero
        m_hFileMap = IntPtr.Zero
    End Sub

    Protected Overrides Sub Finalize()
        Dispose(False)
    End Sub


    ' Private helper methods.
    Private Shared Function AllFlagsSet(ByVal flags As Int32, _
                                        ByVal flagsToTest As Int32) As Boolean
        Return (flags And flagsToTest) = flagsToTest
    End Function

    Private Shared Function AnyFlagsSet(ByVal flags As Int32, _
                                        ByVal flagsToTest As Int32) As Boolean
        Return (flags And flagsToTest) <> 0
    End Function


    ' The security attribute demands that code that calls  
    ' this method have permission to perform serialization.
    <SecurityPermissionAttribute(SecurityAction.Demand, SerializationFormatter:=True)> _
    Sub GetObjectData(ByVal info As SerializationInfo, _
                      ByVal context As StreamingContext) _
                      Implements ISerializable.GetObjectData
        ' The context's State member indicates where the object will be deserialized.

        ' A SharedMemory object cannot be serialized 
        ' to any of the following destinations.
        Const InvalidDestinations As StreamingContextStates = _
           StreamingContextStates.CrossMachine Or _
           StreamingContextStates.File Or _
           StreamingContextStates.Other Or _
           StreamingContextStates.Persistence Or _
           StreamingContextStates.Remoting
        If AnyFlagsSet(CType(context.State, Int32), _
                       CType(InvalidDestinations, Int32)) Then
            Throw New SerializationException("The SharedMemory object " & _
               "cannot be serialized to any of the following streaming contexts: " _
               & InvalidDestinations)
        End If

        Const DeserializableByHandle As StreamingContextStates = _
                 StreamingContextStates.Clone Or _
                 StreamingContextStates.CrossAppDomain

        If AnyFlagsSet(CType(context.State, Int32), _
              CType(DeserializableByHandle, Int32)) Then
            info.AddValue("hFileMap", m_hFileMap)
        End If

        Const DeserializableByName As StreamingContextStates = _
                 StreamingContextStates.CrossProcess   ' The same computer.
        If AnyFlagsSet(CType(context.State, Int32), CType(DeserializableByName, _
                       Int32)) Then
            If m_name = Nothing Then
                Throw New SerializationException("The SharedMemory object " & _
                   "cannot be serialized CrossProcess because it was not constructed " & _
                   "with a String name.")
            End If
            info.AddValue("name", m_name)
        End If
    End Sub

    Private Sub New(ByVal info As SerializationInfo, ByVal context As StreamingContext)
        ' The context's State member indicates where the object was serialized from.

        Const InvalidSources As StreamingContextStates = _
                 StreamingContextStates.CrossMachine Or _
                 StreamingContextStates.File Or _
                 StreamingContextStates.Other Or _
                 StreamingContextStates.Persistence Or _
                 StreamingContextStates.Remoting

        If AnyFlagsSet(CType(context.State, Int32), CType(InvalidSources, Int32)) Then
            Throw New SerializationException("The SharedMemory object " & _
               "cannot be deserialized from any of the following stream contexts: " & _
               InvalidSources)
        End If

        Const SerializedByHandle As StreamingContextStates = _
                 StreamingContextStates.Clone Or _
                 StreamingContextStates.CrossAppDomain ' The same process.
        If AnyFlagsSet(CType(context.State, Int32), _
              CType(SerializedByHandle, Int32)) Then
            Try
                Win32.DuplicateHandle(Win32.GetCurrentProcess(), _
                   CType(info.GetValue("hFileMap", GetType(IntPtr)), IntPtr), _
                      Win32.GetCurrentProcess(), m_hFileMap, 0, False, _
                      Win32.DUPLICATE_SAME_ACCESS)
            Catch e As SerializationException
                Throw New SerializationException("A SharedMemory was not " & _
                   "serialized using any of the following streaming contexts: " & _
                   SerializedByHandle)
            End Try
        End If

        Const SerializedByName As StreamingContextStates = _
                 StreamingContextStates.CrossProcess   ' The same computer.
        If AnyFlagsSet(CType(context.State, Int32), _
                       CType(SerializedByName, Int32)) Then
            Try
                m_name = info.GetString("name")
            Catch e As SerializationException
                Throw New SerializationException("A SharedMemory object " & _
                   "was not serialized using any of the following streaming contexts: " & _
                   SerializedByName)
            End Try
            m_hFileMap = Win32.OpenFileMapping(Win32.FILE_MAP_WRITE, False, m_name)
        End If
        If Not m_hFileMap.Equals(IntPtr.Zero) Then
            m_address = Win32.MapViewOfFile(m_hFileMap, _
               Win32.FILE_MAP_WRITE, 0, 0, IntPtr.Zero)
        Else
            Throw New SerializationException("A SharedMemory object " & _
               "could not be deserialized.")
        End If
    End Sub
End Class

Class App
    <STAThread()> Shared Sub Main()
        Serialize()
        Console.WriteLine()
        Deserialize()
    End Sub

    Shared Sub Serialize()
        ' Create a hashtable of values that will eventually be serialized.
        Dim sm As New SharedMemory(1024, "MyMemory")
        Dim x As Int32
        For x = 0 To 99
            sm.SetByte(x, x)
        Next

        Dim b(9) As Byte
        For x = 0 To b.Length - 1
            b(x) = sm.GetByte(x)
        Next
        Console.WriteLine(BitConverter.ToString(b))

        ' To serialize the hashtable (and its key/value pairs), you must first 
        ' open a stream for writing. Use a file stream here.
        Dim fs As New FileStream("DataFile.dat", FileMode.Create)

        ' Construct a BinaryFormatter telling it where 
        ' the objects will be serialized to.
        Dim formatter As New BinaryFormatter(Nothing, _
           New StreamingContext(StreamingContextStates.CrossAppDomain))
        Try
            formatter.Serialize(fs, sm)
        Catch e As SerializationException
            Console.WriteLine("Failed to serialize. Reason: " + e.Message)
            Throw
        Finally
            fs.Close()
        End Try
    End Sub

    Shared Sub Deserialize()
        ' Declare the hashtable reference.
        Dim sm As SharedMemory = Nothing

        ' Open the file containing the data that you want to deserialize.
        Dim fs As New FileStream("DataFile.dat", FileMode.Open)
        Try
            Dim Formatter As New BinaryFormatter(Nothing, _
               New StreamingContext(StreamingContextStates.CrossAppDomain))

            ' Deserialize the SharedMemory object from the file and 
            ' assign the reference to the local variable.
            sm = DirectCast(Formatter.Deserialize(fs), SharedMemory)
        Catch e As SerializationException
            Console.WriteLine("Failed to deserialize. Reason: " & e.Message)
        Finally
            fs.Close()
        End Try

        ' To prove that the SharedMemory object deserialized correctly, 
        ' display some of its bytes to the console.
        Dim b(9) As Byte
        Dim x As Int32
        For x = 0 To b.Length - 1
            b(x) = sm.GetByte(x)
        Next
        Console.WriteLine(BitConverter.ToString(b))
    End Sub
End Class

Gilt für:

Siehe auch