从SendPingAsync结果检索ping主机名 [英] Retrieving ping host name from SendPingAsync result

问题描述

我正在从字符串（地址）列表中ping主机。一切正常工作，但当主机无法访问ping返回 Result.Address ：0.0.0.0而不是我传入SendPingAsync函数的现有地址或主机名。
这是我的代码：

  var pingTasks = addresses.Select（address => 
 {
 return new Ping（）。SendPingAsync（address）; 
}）; 
 
 await Task.WhenAll（pingTasks）; 
 
 StringBuilder pingResultBuilder = new StringBuilder（）; 
 
 foreach（var pingReply in pingTasks）
 {
 pingResultBuilder.Append（pingReply.Result.Address）; 
 pingResultBuilder.Append（）; 
 
 pingResultBuilder.Append（pingReply.Result.Status）; 
 pingResultBuilder.Append（）; 
 
 pingResultBuilder.Append（pingReply.Result.RoundtripTime.ToString（））; 
 pingResultBuilder.AppendLine（）; 
} 
 
 Console.WriteLine（pingResultBuilder.ToString（））; 
  

我发现解决方案这里，但是我需要在 SendPingAsync 函数，而不是 SendAsync 。
如何从 pingReply.Result 中检索已传递的主机名/ ip地址？

解决方案

您可以使用 SendAsync 编写扩展方法。

  public static class MyExtensions 
 {
 public static Task< PingResult> SendTaskAsync（此Ping ping，字符串地址）
 {
 var tcs = new TaskCompletionSource< PingResult>（）; 
 PingCompletedEventHandler response = null; 
 response =（s，e）=> 
 {
 ping.PingCompleted  -  = response; 
 tcs.SetResult（new PingResult（）{Address = address，Reply = e.Reply}）; 
}; 
 ping.PingCompleted + = response; 
 ping.SendAsync（address，address）; 
 return tcs.Task; 
} 
 
 public class PingResult 
 {
 public string Address {set;得到; } 
 public PingReply回复{set;得到; } 
} 
} 
  

现在可以使用它：

  var pingTasks = addresses.Select（address => 
 {
返回新的Ping（）。SendTaskAsync ）; 
}）; 
 
 var replies = await Task.WhenAll（pingTasks）; 
 
 StringBuilder pingResultBuilder = new StringBuilder（）; 
 
 foreach（var pingReply in reply）
 {
 pingResultBuilder.Append（pingReply.Address）; 
 pingResultBuilder.Append（）; 
 
 pingResultBuilder.Append（pingReply.Reply.Status）; 
 pingResultBuilder.Append（）; 
 
 pingResultBuilder.Append（pingReply.Reply.RoundtripTime.ToString（））; 
 pingResultBuilder.AppendLine（）; 
} 
 
 Console.WriteLine（pingResultBuilder.ToString（））; 
  

I'm pinging hosts from list of strings (addresses). Everything works perfectly but when host is unreachable ping returns Result.Address: "0.0.0.0" instead of existing address or hostname which I passed into SendPingAsync function. Here is my code:

            var pingTasks = addresses.Select(address =>
            {
                return new Ping().SendPingAsync(address);
            });

            await Task.WhenAll(pingTasks);

            StringBuilder pingResultBuilder = new StringBuilder();

            foreach (var pingReply in pingTasks)
            {
                pingResultBuilder.Append(pingReply.Result.Address);
                pingResultBuilder.Append("    ");

                pingResultBuilder.Append(pingReply.Result.Status);
                pingResultBuilder.Append("    ");

                pingResultBuilder.Append(pingReply.Result.RoundtripTime.ToString());
                pingResultBuilder.AppendLine();
            }

            Console.WriteLine(pingResultBuilder.ToString());

I found solution here but I need to do the same thing in SendPingAsync function instead of SendAsync. How can I retrieve passed host name / ip address from pingReply.Result?

解决方案

You can write an extension method using SendAsync.

public static class MyExtensions
{
    public static Task<PingResult> SendTaskAsync(this Ping ping, string address)
    {
        var tcs = new TaskCompletionSource<PingResult>();
        PingCompletedEventHandler response = null;
        response = (s, e) =>
        {
            ping.PingCompleted -= response;
            tcs.SetResult(new PingResult() { Address = address, Reply = e.Reply });
        };
        ping.PingCompleted += response;
        ping.SendAsync(address, address);
        return tcs.Task;
    }

    public class PingResult
    {
        public string Address { set; get; }
        public PingReply Reply { set; get; }
    }
}

You can now use it like:

var pingTasks = addresses.Select(address =>
{
    return new Ping().SendTaskAsync(address);
});

var replies = await Task.WhenAll(pingTasks);

StringBuilder pingResultBuilder = new StringBuilder();

foreach (var pingReply in replies)
{
    pingResultBuilder.Append(pingReply.Address);
    pingResultBuilder.Append("    ");

    pingResultBuilder.Append(pingReply.Reply.Status);
    pingResultBuilder.Append("    ");

    pingResultBuilder.Append(pingReply.Reply.RoundtripTime.ToString());
    pingResultBuilder.AppendLine();
}

Console.WriteLine(pingResultBuilder.ToString());

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