MessageQueuePermission-Klasse

Ermöglicht das Steuern von Codezugriffsberechtigungen für Messaging.

Namespace: System.Messaging
Assembly: System.Messaging (in system.messaging.dll)

Syntax

'Declaration
<SerializableAttribute> _
Public NotInheritable Class MessageQueuePermission
    Inherits CodeAccessPermission
    Implements IUnrestrictedPermission
'Usage
Dim instance As MessageQueuePermission

[SerializableAttribute] 
public sealed class MessageQueuePermission : CodeAccessPermission, IUnrestrictedPermission

[SerializableAttribute] 
public ref class MessageQueuePermission sealed : public CodeAccessPermission, IUnrestrictedPermission

/** @attribute SerializableAttribute() */ 
public final class MessageQueuePermission extends CodeAccessPermission implements IUnrestrictedPermission

SerializableAttribute 
public final class MessageQueuePermission extends CodeAccessPermission implements IUnrestrictedPermission

Beispiel

Im folgenden Codebeispiel werden mehrere Instanzen von MessageQueuePermission erstellt, und es wird die Verwendung der PermissionEntries-Eigenschaft veranschaulicht.

using System;
using System.Messaging;

public class MessageQueuePermissionExample
{
    public static void Main()
    {
        // Create a new instance of the class.
        MessageQueuePermissionExample example =
            new MessageQueuePermissionExample();

        // Create a message queue on the local computer.
        CreateQueue(".\\exampleQueue", false);

        // Demonstrate MessageQueuePermission's constructors.
        example.CreatePermission1();
        example.CreatePermission2();
        example.CreatePermission3();
        example.CreatePermission4();
        example.CreatePermission5();

        // Get and set MessageQueuePermission's PermissionEntries property.
        example.GetPermissionEntries();
    }

    // Creates a new queue.
    public static void CreateQueue(string queuePath, bool transactional)
    {
        if(!MessageQueue.Exists(queuePath))
        {
            MessageQueue.Create(queuePath, transactional);
        }
        else
        {
            Console.WriteLine(queuePath + " already exists.");
        }
    }

    // Demonstrates the following MessageQueuePermission constructor:
    // public #ctor ()
    public void CreatePermission1()
    {
        // Create a new instance of MessageQueuePermission.
        MessageQueuePermission permission = new MessageQueuePermission();
    }

    // Demonstrates the following MessageQueuePermission constructor:
    // public #ctor (MessageQueuePermissionAccess permissionAccess,
    //  String path)
    public void CreatePermission2()
    {
        // Create a new instance of MessageQueuePermission.
        MessageQueuePermission permission = new MessageQueuePermission(
            MessageQueuePermissionAccess.Receive,
            ".\\exampleQueue");
    }

    // Demonstrates the following MessageQueuePermission constructor:
    // public #ctor (MessageQueuePermissionAccess permissionAccess,
    //  String machineName, String label, String category)
    public void CreatePermission3()
    {
        // Connect to a queue on the local computer.
        MessageQueue queue = new MessageQueue(".\\exampleQueue");

        // Create a new instance of MessageQueuePermission.
    string queueCategory = queue.Category.ToString();
    string machineName = queue.MachineName;
    string label = queue.Label;
        MessageQueuePermission permission = new MessageQueuePermission(
            MessageQueuePermissionAccess.Receive,
            machineName,
            label,
            queueCategory);
    }

    // Demonstrates the following MessageQueuePermission constructor:
    //public #ctor (MessageQueuePermissionEntry[] permissionAccessEntries)
    public void CreatePermission4()
    {
        // Connect to a queue on the local computer.
        MessageQueue queue = new MessageQueue(".\\exampleQueue");

        // Create an array of type MessageQueuePermissionEntry.
        MessageQueuePermissionEntry[] entries =
            new MessageQueuePermissionEntry[1];

        // Create a new instance of MessageQueuePermissionEntry and place the
        // instance in the array.
    string machineName = queue.MachineName;
    string label = queue.Label;
        entries[0] = new MessageQueuePermissionEntry(
            MessageQueuePermissionAccess.Receive,
            machineName,
            label,
            queue.Category.ToString());

        // Create a new instance of MessageQueuePermission.
        MessageQueuePermission permission = new MessageQueuePermission(
            entries);
    }

    // Demonstrates the following MessageQueuePermission constructor:
    //public #ctor (PermissionState state)
    public void CreatePermission5()
    {
        // Create a new instance of MessageQueuePermission.
        MessageQueuePermission permission = new MessageQueuePermission(
            System.Security.Permissions.PermissionState.Unrestricted);
    }

    public void GetPermissionEntries()
    {
    
        // Connect to a queue on the local computer.
        MessageQueue queue = new MessageQueue(".\\exampleQueue");

        // Create an array of type MessageQueuePermissionEntry.
        MessageQueuePermissionEntry[] entries =
            new MessageQueuePermissionEntry[1];

        // Create a new instance of MessageQueuePermissionEntry and place the
        // instance in the array.
    string machineName = queue.MachineName;
    string label = queue.Label;
        entries[0] = new MessageQueuePermissionEntry(
            MessageQueuePermissionAccess.Receive,
            machineName,
            label,
            queue.Category.ToString());

        // Create a new instance of MessageQueuePermission.
        MessageQueuePermission permission = new MessageQueuePermission(
            entries);

        // Create a new instance of MessageQueuePermissionEntryCollection and
        // use it to retrieve the permission's PermissionEntries property
        // value.
        MessageQueuePermissionEntryCollection collection =
            permission.PermissionEntries;

        // Loop through the collection.
        foreach(MessageQueuePermissionEntry entry in collection)
        {
            // Display the property values of each MessageQueuePermissionEntry.
            Console.WriteLine("PermissionAccess: {0}", entry.PermissionAccess);
            Console.WriteLine("MachineName: {0}", entry.MachineName);
            Console.WriteLine("Label: {0}", entry.Label);
            Console.WriteLine("Category: {0}", entry.Category.ToString());
        }
    }
}

Vererbungshierarchie

System.Object
   System.Security.CodeAccessPermission
    System.Messaging.MessageQueuePermission

Threadsicherheit

Alle öffentlichen statischen (Shared in Visual Basic) Member dieses Typs sind threadsicher. Bei Instanzmembern ist die Threadsicherheit nicht gewährleistet.

Plattformen

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

.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.

Versionsinformationen

.NET Framework

Unterstützt in: 2.0, 1.1, 1.0

Siehe auch

Referenz

MessageQueuePermission-Member
System.Messaging-Namespace
MessageQueue-Klasse
MessageQueuePermissionAccess
MessageQueuePermissionAttribute
MessageQueuePermissionEntry
MessageQueuePermissionEntryCollection