MessageQueuePermission クラス

.NET Framework クラス ライブラリ リファレンス

MessageQueuePermission クラス

メッセージのコード アクセス許可を制御できるようにします。

名前空間: System.Messaging
アセンブリ: System.Messaging (system.messaging.dll 内)
構文

Visual Basic (宣言)

<SerializableAttribute> _
Public NotInheritable Class
 MessageQueuePermission
    Inherits CodeAccessPermission
    Implements IUnrestrictedPermission

Visual Basic (使用法)

Dim instance As MessageQueuePermission

C#

[SerializableAttribute] 
public sealed class MessageQueuePermission
 : CodeAccessPermission, IUnrestrictedPermission

C++

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

J#

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

JScript

SerializableAttribute 
public final class MessageQueuePermission extends
 CodeAccessPermission implements IUnrestrictedPermission

使用例

MessageQueuePermission の複数のインスタンスを作成し、PermissionEntries プロパティを使用するコード例を次に示します。

C#

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());
        }
    }
}

継承階層

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

スレッド セーフ

この型の public static (Visual Basic では Shared) メンバはすべて、スレッド セーフです。インスタンス メンバの場合は、スレッド セーフであるとは限りません。

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

.NET Framework
サポート対象 : 2.0、1.1、1.0

参照

関連項目
MessageQueuePermission メンバ
System.Messaging 名前空間
MessageQueue クラス
MessageQueuePermissionAccess
MessageQueuePermissionAttribute
MessageQueuePermissionEntry
MessageQueuePermissionEntryCollection