本文整理汇总了C#中System.Messaging.MessageQueue.Peek方法的典型用法代码示例。如果您正苦于以下问题：C# MessageQueue.Peek方法的具体用法？C# MessageQueue.Peek怎么用？C# MessageQueue.Peek使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.Messaging.MessageQueue的用法示例。
在下文中一共展示了MessageQueue.Peek方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: Main
//引入命名空间
using System;
using System.Messaging;
namespace MyProject
{
// This class represents an object the following example
// sends to a queue and receives from a queue.
public class Order
{
public int orderId;
public DateTime orderTime;
};
/// <summary>
/// Provides a container class for the example.
/// </summary>
public class MyNewQueue
{
//**************************************************
// Provides an entry point into the application.
//
// This example posts a notification that a message
// has arrived in a queue. It sends a message
// containing an other to a separate queue, and then
// peeks the first message in the queue.
//**************************************************
public static void Main()
{
// Create a new instance of the class.
MyNewQueue myNewQueue = new MyNewQueue();
// Wait for a message to arrive in the queue.
myNewQueue.NotifyArrived();
// Send a message to a queue.
myNewQueue.SendMessage();
// Peek the first message in the queue.
myNewQueue.PeekFirstMessage();
return;
}
//**************************************************
// Posts a notification when a message arrives in
// the queue "monitoredQueue". Does not retrieve any
// message information when peeking the message.
//**************************************************
public void NotifyArrived()
{
// Connect to a queue.
MessageQueue myQueue = new
MessageQueue(".\\monitoredQueue");
// Specify to retrieve no message information.
myQueue.MessageReadPropertyFilter.ClearAll();
// Wait for a message to arrive.
Message emptyMessage = myQueue.Peek();
// Post a notification when a message arrives.
Console.WriteLine("A message has arrived in the queue.");
return;
}
//**************************************************
// Sends an Order to a queue.
//**************************************************
public void SendMessage()
{
// Create a new order and set values.
Order sentOrder = new Order();
sentOrder.orderId = 3;
sentOrder.orderTime = DateTime.Now;
// Connect to a queue on the local computer.
MessageQueue myQueue = new MessageQueue(".\\myQueue");
// Send the Order to the queue.
myQueue.Send(sentOrder);
return;
}
//**************************************************
// Peeks a message containing an Order.
//**************************************************
public void PeekFirstMessage()
{
// Connect to a queue.
MessageQueue myQueue = new MessageQueue(".\\myQueue");
// Set the formatter to indicate the body contains an Order.
myQueue.Formatter = new XmlMessageFormatter(new Type[]
{typeof(MyProject.Order)});
try
{
// Peek and format the message.
Message myMessage = myQueue.Peek();
Order myOrder = (Order)myMessage.Body;
// Display message information.
Console.WriteLine("Order ID: " +
myOrder.orderId.ToString());
Console.WriteLine("Sent: " +
myOrder.orderTime.ToString());
}
catch (MessageQueueException)
{
// Handle Message Queuing exceptions.
}
// Handle invalid serialization format.
catch (InvalidOperationException e)
{
Console.WriteLine(e.Message);
}
// Catch other exceptions as necessary.
return;
}
}
}示例2: Main
//引入命名空间
using System;
using System.Messaging;
namespace MyProject
{
/// <summary>
/// Provides a container class for the example.
/// </summary>
public class MyNewQueue
{
//**************************************************
// Provides an entry point into the application.
//
// This example determines whether a queue is empty.
//**************************************************
public static void Main()
{
// Create a new instance of the class.
MyNewQueue myNewQueue = new MyNewQueue();
// Determine whether a queue is empty.
bool isQueueEmpty = myNewQueue.IsQueueEmpty();
return;
}
//**************************************************
// Determines whether a queue is empty. The Peek()
// method throws an exception if there is no message
// in the queue. This method handles that exception
// by returning true to the calling method.
//**************************************************
public bool IsQueueEmpty()
{
bool isQueueEmpty = false;
// Connect to a queue.
MessageQueue myQueue = new MessageQueue(".\\myQueue");
try
{
// Set Peek to return immediately.
myQueue.Peek(new TimeSpan(0));
// If an IOTimeout was not thrown, there is a message
// in the queue.
isQueueEmpty = false;
}
catch(MessageQueueException e)
{
if (e.MessageQueueErrorCode ==
MessageQueueErrorCode.IOTimeout)
{
// No message was in the queue.
isQueueEmpty = true;
}
// Handle other sources of MessageQueueException.
}
// Handle other exceptions as necessary.
// Return true if there are no messages in the queue.
return isQueueEmpty;
}
}
}