C# 如何使用 .NET 创建下载速度测试
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How to Create a Download speed test with .NET
提问by Aussie Ausbourne
I'd like to create a speed test to test the connection.
我想创建一个速度测试来测试连接。
What I would like is a 15sec download which then gives me the average download speed.
我想要的是 15 秒的下载时间，然后给我平均下载速度。
Anyone knows how to create this? or has a better idea to make a speed test?
任何人都知道如何创建这个？或者有更好的主意来进行速度测试？
回答by Matt Campbell
- Use a known file size and trap how long it takes to download. (using two DateTime.now()s)
- 使用已知的文件大小并捕获下载所需的时间。（使用两个 DateTime.now()s）
There is a library on CodeProject that I found. It is a couple of C# classes that let you monitor your network connections including upload and download speeds. Link here
我在 CodeProject 上找到了一个库。它是几个 C# 类，可让您监控网络连接，包括上传和下载速度。链接在这里
回答by Omar Abid
In Visual Basic dot net, the "My" class provide a function to download files, try to search for its alias in C#. Then create a timer counter and count seconds ellapsed since the download began.
在 Visual Basic dot net 中，“My”类提供了下载文件的功能，尝试在 C# 中搜索它的别名。然后创建一个计时器计数器并计算自下载开始以来经过的秒数。
回答by kay.one
This sample will try to download googletalk, and then outputs details of the download.
此示例将尝试下载 googletalk，然后输出下载的详细信息。
ps. when trying to time and operation avoid using DateTime as they can cause problems or inacurecy, always use Stopwatch available at System.Diognostics namespace.
附：在尝试计时和操作时，请避免使用 DateTime，因为它们可能会导致问题或不准确，请始终使用 System.Diognostics 命名空间中可用的秒表。
const string tempfile = "tempfile.tmp";
System.Net.WebClient webClient = new System.Net.WebClient();
Console.WriteLine("Downloading file....");
System.Diagnostics.Stopwatch sw = System.Diagnostics.Stopwatch.StartNew();
webClient.DownloadFile("http://dl.google.com/googletalk/googletalk-setup.exe", tempfile);
sw.Stop();
FileInfo fileInfo = new FileInfo(tempfile);
long speed = fileInfo.Length / sw.Elapsed.Seconds;
Console.WriteLine("Download duration: {0}", sw.Elapsed);
Console.WriteLine("File size: {0}", fileInfo.Length.ToString("N0"));
Console.WriteLine("Speed: {0} bps ", speed.ToString("N0"));
Console.WriteLine("Press any key to continue...");
Console.ReadLine();
回答by Vineet Menon
how can a download file give you correct link speed. what you get by downloading file is a great underestimate of the actual speed what you get.
下载文件如何为您提供正确的链接速度。您通过下载文件获得的速度大大低估了您获得的实际速度。
What i think is you should do some udp sort of packet transfer and find the time required to receive it at the other end.
我认为你应该做一些 udp 类型的数据包传输，并找到在另一端接收它所需的时间。
regards,
问候，
回答by Vineet Menon
Use the code to check internet connection speed using C#:
使用代码通过 C# 检查互联网连接速度：
private long bytesReceivedPrev = 0;
private void CheckBandwidthUsage(DateTime now)
{
NetworkInterface[] interfaces = NetworkInterface.GetAllNetworkInterfaces();
long bytesReceived = 0;
foreach (NetworkInterface inf in interfaces)
{
if (inf.OperationalStatus == OperationalStatus.Up &&
inf.NetworkInterfaceType != NetworkInterfaceType.Loopback &&
inf.NetworkInterfaceType != NetworkInterfaceType.Tunnel &&
inf.NetworkInterfaceType != NetworkInterfaceType.Unknown && !inf.IsReceiveOnly)
{
bytesReceived += inf.GetIPv4Statistics().BytesReceived;
}
}
if (bytesReceivedPrev == 0)
{
bytesReceivedPrev = bytesReceived;
}
long bytesUsed = bytesReceived - bytesReceivedPrev;
double kBytesUsed = bytesUsed / 1024;
double mBytesUsed = kBytesUsed / 1024;
internetUsage.Add(now, mBytesUsed);
if (internetUsage.Count > 20)
{
internetUsage.Remove(internetUsage.Keys.First());
}
bytesReceivedPrev = bytesReceived;
}
private void CheckInternetSpeed(DateTime now)
{
WebClient client = new WebClient();
Uri URL = new Uri("http://sixhoej.net/speedtest/1024kb.txt");
double starttime = Environment.TickCount;
client.DownloadFile(URL, Constants.GetAppDataPath() + "\" + now.Ticks);
double endtime = Environment.TickCount;
double secs = Math.Floor(endtime - starttime) / 1000;
double secs2 = Math.Round(secs, 0);
double kbsec = Math.Round(1024 / secs);
double mbsec = kbsec / 100;
internetSpeed.Add(now, mbsec);
if (internetSpeed.Count > 20)
{
internetSpeed.Remove(internetSpeed.Keys.First());
}
client.Dispose();
try
{
// delete downloaded file
System.IO.File.Delete(Constants.GetAppDataPath() + "\" + now.Ticks);
}
catch (Exception ex1)
{
Console.WriteLine(ex1.Message);
}
}
回答by T-moty
As publicENEMYsays, the kay.one's answer could give a wrong speed, because the HDD's speed can be lower than the network speed (for example: Google Gigabit Fiber is much faster than a 5200rpm HDD's average write speed)
正如publicENEMY所说，kay.one的答案可能会给出错误的速度，因为硬盘的速度可能低于网络速度（例如：Google Gigabit Fiber 比 5200rpm 硬盘的平均写入速度快得多）
This is an example code derived from the kay.one's answer, but downloads the data content into a System.Byte[], and therefore in memory.
这是从kay.one的答案派生的示例代码，但将数据内容下载到 a 中System.Byte[]，因此在内存中。
Also i notice that after the very first download, the speed increases dramatically and jumps over the real network speed, because System.Net.WebClientuses the IE's download cache: for my requirements i only add the tquerystring parameter, clearly unique for each request.
我还注意到，在第一次下载后，速度急剧增加并超过了实际网络速度，因为System.Net.WebClient使用了 IE 的下载缓存：对于我的要求，我只添加了tquerystring 参数，每个请求显然都是唯一的。
EDIT
编辑
as.beaulieufinds an issue using TimeSpan.Secondsfor the calculation, both for very fast and very slow downloads.
as.beaulieu发现了一个TimeSpan.Seconds用于计算的问题，无论是非常快还是非常慢的下载。
We just need to use TimeSpan.TotalSecondsinstead.
我们只需要使用TimeSpan.TotalSeconds代替。
Console.WriteLine("Downloading file....");
var watch = new Stopwatch();
byte[] data;
using (var client = new System.Net.WebClient())
{
watch.Start();
data = client.DownloadData("http://dl.google.com/googletalk/googletalk-setup.exe?t=" + DateTime.Now.Ticks);
watch.Stop();
}
var speed = data.LongLength / watch.Elapsed.TotalSeconds; // instead of [Seconds] property
Console.WriteLine("Download duration: {0}", watch.Elapsed);
Console.WriteLine("File size: {0}", data.Length.ToString("N0"));
Console.WriteLine("Speed: {0} bps ", speed.ToString("N0"));
Console.WriteLine("Press any key to continue...");
Console.ReadLine();
