我们正在开发一个将安装在 PC 上的应用程序，它将执行一些后台上传和下载到我们的服务器/从我们的服务器下载。其中一项要求是检测互联网连接当前是否繁忙(比如利用率超过 50%)，如果是，则需要后退并再次尝试。主要原因是确保应用程序不会干扰用户在玩游戏、看在线电影或大量下载文件时的体验
在对 google 和当然 SO 进行了大量思考和研究之后，我仍然没有找到实现它的好方法，所以决定把它扔在这里。 该应用程序是在 C#、.NET 4.0 中实现的，我正在寻找所有形式的响应 - 在 C# 或其他语言中的实现、伪逻辑或如何实现的方法 - 测量互联网流量利用率具有足够高准确度的本地 PC。
为了避免重复劳动，到目前为止我已经尝试了这些(以及它们不适合的原因)
- 使用 WMI 获取网络统计信息。大多数 SO 帖子和解决方案都在那里，因为将此称为方法，但它不符合我们的要求，因为根据网络接口(interface)容量(例如 1GB 以太网卡)测量发送/接收的字节的利用率将产生一个很好的 LAN 流量测量但不适用于互联网流量(实际互联网带宽可能只有 8Mbps)
- 使用 .NET 网络信息统计或性能计数器 - 产生与上述类似的读数，因此具有相同的缺点
- 使用 ICMP (Ping) 并测量 RTT。有人建议 400 毫秒 RTT 被认为是繁忙网络的慢速和良好指示，但我被告知使用调制解调器的用户(是的，我们必须支持)，使用反向代理或微波链接通常会在 ping 以上，因此不是一个好测量
- 开始下载一个已知文件并测量速度——这本身会产生我们试图避免的流量，而且如果这种检查足够频繁地进行，我们的应用程序最终会产生大量互联网流量——这同样不理想
- MOD:使用 BITS - 可以在用户 PC 上禁用此服务，需要更改组策略并假设服务器是 IIS(具有自定义配置)，在我们的例子中我们的服务器不是 IIS
就是这样，我很困惑，正在寻找一些建议。我突出显示了问题文本，这样你们就不会在阅读本文时迷路并想知道问题是什么。谢谢。
最佳答案
您可以使用 UPnP 查询路由器，并检索通过网络发送和接收的字节数。您可以在路由器上不断检查此值以确定事件是什么。不幸的是，此功能似乎没有详细记录，但可以在 C# 应用程序中实现 UPnP 通信功能。您将需要使用 UDP 查询路由器(UPnP 发现)，一旦找到设备，查询其功能，然后使用 WebClient (TCP) 查询互联网网关设备发送和接收的数据包数。
Code for a UPnP library:
using System;
using System.Collections.Generic;
using System.Text;
using System.Net.Sockets;
using System.Net;
using System.Xml;
using System.IO;
namespace UPNPLib
{
public class RouterElement
{
public RouterElement()
{
}
public override string ToString()
{
return Name;
}
public List children = new List();
public RouterElement parent;
public string Name;
public string Value;
public RouterElement this[string name] {
get
{
foreach (RouterElement et in children)
{
if (et.Name.ToLower().Contains(name.ToLower()))
{
return et;
}
}
foreach (RouterElement et in children)
{
Console.WriteLine(et.Name);
}
throw new KeyNotFoundException("Unable to find the specified entry");
}
}
public RouterElement(XmlNode node, RouterElement _parent)
{
Name = node.Name;
if (node.ChildNodes.Count
/// Gets the root URL of the device
///
///
public static string GetRootUrl()
{
StringBuilder mbuilder = new StringBuilder();
mbuilder.Append("M-SEARCH * HTTP/1.1\r\n");
mbuilder.Append("HOST: 239.255.255.250:1900\r\n");
mbuilder.Append("ST:upnp:rootdevice\r\n");
mbuilder.Append("MAN:\"ssdp:discover\"\r\n");
mbuilder.Append("MX:3\r\n\r\n");
UdpClient mclient = new UdpClient();
byte[] dgram = Encoding.ASCII.GetBytes(mbuilder.ToString());
mclient.Send(dgram,dgram.Length,new IPEndPoint(IPAddress.Broadcast,1900));
IPEndPoint mpoint = new IPEndPoint(IPAddress.Any, 0);
rootsearch:
dgram = mclient.Receive(ref mpoint);
string mret = Encoding.ASCII.GetString(dgram);
string orig = mret;
mret = mret.ToLower();
string url = orig.Substring(mret.IndexOf("location:") + "location:".Length, mret.IndexOf("\r", mret.IndexOf("location:")) - (mret.IndexOf("location:") + "location:".Length));
WebClient wclient = new WebClient();
try
{
Console.WriteLine("POLL:" + url);
string reply = wclient.DownloadString(url);
if (!reply.ToLower().Contains("router"))
{
goto rootsearch;
}
}
catch (Exception)
{
goto rootsearch;
}
return url;
}
public static RouterElement enumRouterFunctions(string url)
{
XmlReader mreader = XmlReader.Create(url);
XmlDocument md = new XmlDocument();
md.Load(mreader);
XmlNodeList rootnodes = md.GetElementsByTagName("serviceList");
RouterElement elem = new RouterElement();
foreach (XmlNode et in rootnodes)
{
RouterElement el = new RouterElement(et, null);
elem.children.Add(el);
}
return elem;
}
public static RouterElement getRouterInformation(string url)
{
XmlReader mreader = XmlReader.Create(url);
XmlDocument md = new XmlDocument();
md.Load(mreader);
XmlNodeList rootnodes = md.GetElementsByTagName("device");
return new RouterElement(rootnodes[0], null);
}
}
public class RouterMethod
{
string url;
public string MethodName;
string parentname;
string MakeRequest(string URL, byte[] data, string[] headers)
{
Uri mri = new Uri(URL);
TcpClient mclient = new TcpClient();
mclient.Connect(mri.Host, mri.Port);
Stream mstream = mclient.GetStream();
StreamWriter textwriter = new StreamWriter(mstream);
textwriter.Write("POST "+mri.PathAndQuery+" HTTP/1.1\r\n");
textwriter.Write("Connection: Close\r\n");
textwriter.Write("Content-Type: text/xml; charset=\"utf-8\"\r\n");
foreach (string et in headers)
{
textwriter.Write(et + "\r\n");
}
textwriter.Write("Content-Length: " + (data.Length).ToString()+"\r\n");
textwriter.Write("Host: " + mri.Host+":"+mri.Port+"\r\n");
textwriter.Write("\r\n");
textwriter.Flush();
Stream reqstream = mstream;
reqstream.Write(data, 0, data.Length);
reqstream.Flush();
StreamReader reader = new StreamReader(mstream);
while (reader.ReadLine().Length > 2)
{
}
return reader.ReadToEnd();
}
public RouterElement Invoke(string[] args)
{
MemoryStream mstream = new MemoryStream();
StreamWriter mwriter = new StreamWriter(mstream);
//TODO: Implement argument list
string arglist = "";
mwriter.Write("" + "" + "");
mwriter.Write("");//" + arglist + "");
mwriter.Write("");
mwriter.Flush();
List headers = new List();
headers.Add("SOAPAction: \"" + parentschema + "#" + MethodName + "\"");
mstream.Position = 0;
byte[] dgram = new byte[mstream.Length];
mstream.Read(dgram, 0, dgram.Length);
XmlDocument mdoc = new XmlDocument();
string txt = MakeRequest(url, dgram, headers.ToArray());
mdoc.LoadXml(txt);
try
{
RouterElement elem = new RouterElement(mdoc.ChildNodes[0], null);
return elem["Body"].children[0];
}
catch (Exception er)
{
RouterElement elem = new RouterElement(mdoc.ChildNodes[1], null);
return elem["Body"].children[0];
}
}
public List parameters = new List();
string baseurl;
string parentschema;
public RouterMethod(string svcurl, RouterElement element,string pname, string baseURL, string svcpdsc)
{
parentschema = svcpdsc;
baseurl = baseURL;
parentname = pname;
url = svcurl;
MethodName = element["name"].Value;
try
{
foreach (RouterElement et in element["argumentList"].children)
{
parameters.Add(et.children[0].Value);
}
}
catch (KeyNotFoundException)
{
}
}
}
public class RouterService
{
string url;
public string ServiceName;
public List methods = new List();
public RouterMethod GetMethodByNonCaseSensitiveName(string name)
{
foreach (RouterMethod et in methods)
{
if (et.MethodName.ToLower() == name.ToLower())
{
return et;
}
}
throw new KeyNotFoundException();
}
public RouterService(RouterElement element, string baseurl)
{
ServiceName = element["serviceId"].Value;
url = element["controlURL"].Value;
WebClient mclient = new WebClient();
string turtle = element["SCPDURL"].Value;
if (!turtle.ToLower().Contains("http"))
{
turtle = baseurl + turtle;
}
Console.WriteLine("service URL " + turtle);
string axml = mclient.DownloadString(turtle);
XmlDocument mdoc = new XmlDocument();
if (!url.ToLower().Contains("http"))
{
url = baseurl + url;
}
mdoc.LoadXml(axml);
XmlNode mainnode = mdoc.GetElementsByTagName("actionList")[0];
RouterElement actions = new RouterElement(mainnode, null);
foreach (RouterElement et in actions.children)
{
RouterMethod method = new RouterMethod(url, et,ServiceName,baseurl,element["serviceType"].Value);
methods.Add(method);
}
}
}
}
Code for a bandwidth meter:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using UPNPLib;
using System.IO;
namespace bandwidthmeter
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
BinaryReader mreader = new BinaryReader(File.Open("bandwidthlog.txt", FileMode.OpenOrCreate));
if (mreader.BaseStream.Length > 0)
{
prevsent = mreader.ReadInt64();
prevrecv = mreader.ReadInt64();
}
mreader.Close();
List services = new List();
string fullurl = UPNP.GetRootUrl();
RouterElement router = UPNP.enumRouterFunctions(fullurl);
Console.WriteLine("Router feature enumeration complete");
foreach (RouterElement et in router.children)
{
services.Add(new RouterService(et.children[0], fullurl.Substring(0, fullurl.IndexOf("/", "http://".Length+1))));
}
getReceiveDelegate = services[1].GetMethodByNonCaseSensitiveName("GetTotalBytesReceived");
getSentDelegate = services[1].GetMethodByNonCaseSensitiveName("GetTotalBytesSent");
Console.WriteLine("Invoking " + getReceiveDelegate.MethodName);
//Console.WriteLine(services[1].GetMethodByNonCaseSensitiveName("GetTotalPacketsSent").Invoke(null));
Timer mymer = new Timer();
mymer.Tick += new EventHandler(mymer_Tick);
mymer.Interval = 1000;
mymer.Start();
FormClosed += new FormClosedEventHandler(Form1_FormClosed);
}
long prevsent = 0;
long prevrecv = 0;
void Form1_FormClosed(object sender, FormClosedEventArgs e)
{
BinaryWriter mwriter = new BinaryWriter(File.Open("bandwidthlog.txt", FileMode.OpenOrCreate));
mwriter.Write(getsent());
mwriter.Write(getreceived());
mwriter.Flush();
mwriter.Close();
}
long getsent()
{
long retval = Convert.ToInt64(getSentDelegate.Invoke(null).children[0].Value);
if (prevsent > retval)
{
retval = prevsent + retval;
}
return retval;
}
long getreceived()
{
long retval = Convert.ToInt64(getReceiveDelegate.Invoke(null).children[0].Value);
if (prevrecv > retval)
{
retval = prevrecv + retval;
}
return retval;
}
void mymer_Tick(object sender, EventArgs e)
{
label1.Text = "Sent: "+(getsent()/1024/1024).ToString()+"MB\nReceived: "+(getreceived()/1024/1024).ToString()+"MB";
}
RouterMethod getSentDelegate;
RouterMethod getReceiveDelegate;
}
}
关于c# - 检测互联网连接是否繁忙，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/9394437/