MessageQueuePermission Classe

Definizione

public ref class MessageQueuePermission sealed : System::Security::CodeAccessPermission, System::Security::Permissions::IUnrestrictedPermission

[System.Serializable]
public sealed class MessageQueuePermission : System.Security.CodeAccessPermission, System.Security.Permissions.IUnrestrictedPermission

[<System.Serializable>]
type MessageQueuePermission = class
    inherit CodeAccessPermission
    interface IUnrestrictedPermission

Public NotInheritable Class MessageQueuePermission
Inherits CodeAccessPermission
Implements IUnrestrictedPermission

Ereditarietà

Object

CodeAccessPermission

MessageQueuePermission

Attributi

SerializableAttribute

Implementazioni

IUnrestrictedPermission

Esempio

Nell'esempio di codice seguente vengono create diverse istanze di MessageQueuePermission e viene illustrato l'uso della PermissionEntries proprietà .

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());
        }
    }
}

Vedi anche

• MessageQueue
• MessageQueuePermissionAccess
• MessageQueuePermissionAttribute
• MessageQueuePermissionEntry
• MessageQueuePermissionEntryCollection