PingReply.Options 属性

定义

命名空间:

System.Net.NetworkInformation

程序集:

System.Net.Ping.dll

Source:

PingReply.cs

获取用于将答复传输到 Internet 控制消息协议 (ICMP) 回送请求的选项。

public:
 property System::Net::NetworkInformation::PingOptions ^ Options { System::Net::NetworkInformation::PingOptions ^ get(); };

public System.Net.NetworkInformation.PingOptions? Options { get; }

member this.Options : System.Net.NetworkInformation.PingOptions

Public ReadOnly Property Options As PingOptions

属性值

PingOptions

如果 PingOptions 是 Status，则为一个包含生存时间 (TTL) 和用于传输答复的分段指令的 Success 对象；否则为 null。

示例

下面的代码示例以同步方式发送 ICMP 回显请求，并显示此属性返回的对象 PingOptions 中存储的值。

void LocalPing()
{
   
   // Ping's the local machine.
   Ping ^ pingSender = gcnew Ping;
   IPAddress^ address = IPAddress::Loopback;
   PingReply ^ reply = pingSender->Send( address );
   if ( reply->Status == IPStatus::Success )
   {
      Console::WriteLine( "Address: {0}", reply->Address->ToString() );
      Console::WriteLine( "RoundTrip time: {0}", reply->RoundtripTime );
      Console::WriteLine( "Time to live: {0}", reply->Options->Ttl );
      Console::WriteLine( "Don't fragment: {0}", reply->Options->DontFragment );
      Console::WriteLine( "Buffer size: {0}", reply->Buffer->Length );
   }
   else
   {
      Console::WriteLine( reply->Status );
   }
}

public static void LocalPing ()
{
    // Ping's the local machine.
    Ping pingSender = new Ping ();
    IPAddress address = IPAddress.Loopback;
    PingReply reply = pingSender.Send (address);

    if (reply.Status == IPStatus.Success)
    {
        Console.WriteLine ("Address: {0}", reply.Address.ToString ());
        Console.WriteLine ("RoundTrip time: {0}", reply.RoundtripTime);
        Console.WriteLine ("Time to live: {0}", reply.Options.Ttl);
        Console.WriteLine ("Don't fragment: {0}", reply.Options.DontFragment);
        Console.WriteLine ("Buffer size: {0}", reply.Buffer.Length);
    }
    else
    {
        Console.WriteLine (reply.Status);
    }
}

注解

TTL 定义节点在其源和目标之间传输数据包时可以转发的次数。 如果转发数（也称为跃点）超过为 TTL 指定的值，则认为数据包不可送达并被丢弃。

DontFragment ICMP 回显请求中指定的值控制数据包碎片。 如果 DontFragment 为 true ，并且数据包大小超过数据包采用的网络路径的最大传输单位，则丢弃数据包并 PacketTooBig 返回错误。