我正在尝试计算一组服务器的平均往返时间。为了加快速度，我想并行执行 ping。我编写了一个名为 AverageRoundtripTime() 的函数，它似乎可以工作，但是，由于我不太了解多线程，所以我想知道我所做的是否正确。请看一下我的代码，让我知道是否可以，或者是否有更好的方法来实现我想要的:

public void Main()
{
    // Collection of hosts.
    List<String> hosts = new List<String>();

    // Add 100 hosts to the collection.
    for (Int32 i = 0; i < 100; ++i) hosts.Add("www.google.com");

    // Display the average round-trip time for 100 hosts.
    Console.WriteLine(AverageRoundtripTime(hosts));

}

public Double AverageRoundtripTime(IEnumerable<String> hosts)
{
    // Collection of threads.
    List<Thread> threads = new List<Thread>();

    // Collection of ping replies.
    List<PingReply> pingReplies = new List<PingReply>();

    // Loop through all host names.
    foreach (var host in hosts)
    {
        // Create a new thread.
        Thread thread = new Thread(() =>
        {
            // Variable to hold the ping reply.
            PingReply reply = null;

            // Create a new Ping object and make sure that it's 
            // disposed after we're finished with it.
            using (Ping ping = new Ping())
            {
                    reply = ping.Send(host);

            }

            // Get exclusive lock on the pingReplies collection.
            lock (pingReplies)
            {
                // Add the ping reply to the collection.
                pingReplies.Add(reply);

            }

        });

        // Add the newly created thread to the theads collection.
        threads.Add(thread);

        // Start the thread.
        thread.Start();

    }

    // Wait for all threads to complete
    foreach (Thread thread in threads)
    {
        thread.Join();

    }

    // Calculate and return the average round-trip time.
    return pingReplies.Average(x => x.RoundtripTime);

}

更新:

看看我问的一个相关问题:

Task Parallel Library Code Freezes in a Windows Forms Application - Works fine as a Windows Console Application

最佳答案

ping 类有一个方法 SendAsync。这遵循基于事件的异步编程 (EAP) 模式。查看这篇文章:http://msdn.microsoft.com/en-us/library/ee622454.aspx .

这里有一个简单的例子，我有一个方法，它以非常基本的方式实现了那篇文章。您基本上可以根据需要多次调用它，并且所有 ping 操作都将异步完成。

    class Program
    {
    public static string[] addresses = {"microsoft.com", "yahoo.com", "google.com"};
    static void Main(string[] args)
    {
        List<Task<PingReply>> pingTasks = new List<Task<PingReply>>();
        foreach (var address in addresses)
        {
            pingTasks.Add(PingAsync(address));
        }

        //Wait for all the tasks to complete
        Task.WaitAll(pingTasks.ToArray());

        //Now you can iterate over your list of pingTasks
        foreach (var pingTask in pingTasks)
        {
            //pingTask.Result is whatever type T was declared in PingAsync
            Console.WriteLine(pingTask.Result.RoundtripTime);
        }
        Console.ReadLine();
    }

    static Task<PingReply> PingAsync(string address)
    {
        var tcs = new TaskCompletionSource<PingReply>();
        Ping ping = new Ping();
        ping.PingCompleted += (obj, sender) =>
            {
                tcs.SetResult(sender.Reply);
            };
        ping.SendAsync(address, new object());
        return tcs.Task;
    }
}

关于c# - 如何使用 C# 并行执行多个 "Pings"，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/13405848/