首先，我知道UDP不是一个可靠的协议，但我需要在UDP中使用它，并且我知道最终可能发生的后果。
假设我有一个很长的byte数组，我将其以32字节的块分成List<byte[]>。这意味着发送的每个数据包的长度都是32字节。
这些数据包将在foreach循环中发送，我不在乎它们是否到达目的地。这意味着我不期待主持人的确认（至少目前为止）。
我的问题是，在接收数据包时，我如何计算服务器的当前传输速率（最好以kbps为单位）？
我对如何实现这样的计算感到有点困惑......
答案 0 :(得分：3)
如果您的问题是“如何计算传输速率”，则可以将下载的字节总数除以通过的总秒数。
bytes
--------- = transfer rate
seconds
在C＃中测量时间的一个好方法是StopWatch类，因为计算机科学中的K是1024（或2 ^ 10），你可以将字节数除以1024（或移位），然后将其除以下载该千字节数所需的秒数。
如果您对平均传输速率感兴趣，则需要按间隔测量下载的字节数。您可以使用二维列表执行此操作，保留测量点以及下载的字节和时间。为简单起见，将其分解为执行计算的类
private readonly Stopwatch watch;
private readonly long[,] average;
public .ctor() {
// use 10 measure points, for a larger or smaller average, adjust the 10
average = new long[10, 2];
watch = Stopwatch.StartNew();
}
public long BytesTransferred {
set {
for (int i = average.GetLength(0) - 1; i > 0; --i) {
average[i, 0] = average[i - 1, 0];
average[i, 1] = average[i - 1, 1];
}
average[0, 0] = sent = value;
average[0, 1] = watch.ElapsedMilliseconds;
}
}
public long TransferRate {
get {
int l = average.GetLength(0) - 1;
double bytes = average[0, 0] - average[l, 0];
double seconds = (average[0, 1] - average[l, 1]) / 1000d;
return (long)(bytes / seconds);
}
}
在下载方法中，中断新线程，创建上述类的实例，并在每个时间间隔内调用BytesTransferred = totalBytes;。每次调用TransferRate时都会计算TransferRate。 请注意，它是bytes / s ，如果你想要另一个单位，则相应地除以1024.
答案 1 :(得分：1)
我们在fireBwall上使用一个简单的系统，每次检查时都会更新传输速率。它还存储发送的总信息。我刚从fireBwall的Google Code页面复制了这个。
/// <summary>
/// Class to manage an adapters total transfered data
/// </summary>
public class BandwidthCounter
{
/// <summary>
/// Class to manage an adapters current transfer rate
/// </summary>
class MiniCounter
{
public uint bytes = 0;
public uint kbytes = 0;
public uint mbytes = 0;
public uint gbytes = 0;
public uint tbytes = 0;
public uint pbytes = 0;
DateTime lastRead = DateTime.Now;
/// <summary>
/// Adds bits(total misnomer because bits per second looks a lot better than bytes per second)
/// </summary>
/// <param name="count">The number of bits to add</param>
public void AddBytes(uint count)
{
bytes += count;
while (bytes > 1024)
{
kbytes++;
bytes -= 1024;
}
while (kbytes > 1024)
{
mbytes++;
kbytes -= 1024;
}
while (mbytes > 1024)
{
gbytes++;
mbytes -= 1024;
}
while (gbytes > 1024)
{
tbytes++;
gbytes -= 1024;
}
while (tbytes > 1024)
{
pbytes++;
tbytes -= 1024;
}
}
/// <summary>
/// Returns the bits per second since the last time this function was called
/// </summary>
/// <returns></returns>
public override string ToString()
{
if (pbytes > 0)
{
double ret = (double)pbytes + ((double)((double)tbytes / 1024));
ret = ret / (DateTime.Now - lastRead).TotalSeconds;
lastRead = DateTime.Now;
string s = ret.ToString();
if (s.Length > 6)
s = s.Substring(0, 6);
return s + " Pb";
}
else if (tbytes > 0)
{
double ret = (double)tbytes + ((double)((double)gbytes / 1024));
ret = ret / (DateTime.Now - lastRead).TotalSeconds;
lastRead = DateTime.Now;
string s = ret.ToString();
if (s.Length > 6)
s = s.Substring(0, 6);
return s + " Tb";
}
else if (gbytes > 0)
{
double ret = (double)gbytes + ((double)((double)mbytes / 1024));
ret = ret / (DateTime.Now - lastRead).TotalSeconds;
lastRead = DateTime.Now;
string s = ret.ToString();
if (s.Length > 6)
s = s.Substring(0, 6);
return s + " Gb";
}
else if (mbytes > 0)
{
double ret = (double)mbytes + ((double)((double)kbytes / 1024));
ret = ret / (DateTime.Now - lastRead).TotalSeconds;
lastRead = DateTime.Now;
string s = ret.ToString();
if (s.Length > 6)
s = s.Substring(0, 6);
return s + " Mb";
}
else if (kbytes > 0)
{
double ret = (double)kbytes + ((double)((double)bytes / 1024));
ret = ret / (DateTime.Now - lastRead).TotalSeconds;
lastRead = DateTime.Now;
string s = ret.ToString();
if (s.Length > 6)
s = s.Substring(0, 6);
return s + " Kb";
}
else
{
double ret = bytes;
ret = ret / (DateTime.Now - lastRead).TotalSeconds;
lastRead = DateTime.Now;
string s = ret.ToString();
if (s.Length > 6)
s = s.Substring(0, 6);
return s + " b";
}
}
}
private uint bytes = 0;
private uint kbytes = 0;
private uint mbytes = 0;
private uint gbytes = 0;
private uint tbytes = 0;
private uint pbytes = 0;
MiniCounter perSecond = new MiniCounter();
/// <summary>
/// Empty constructor, because thats constructive
/// </summary>
public BandwidthCounter()
{
}
/// <summary>
/// Accesses the current transfer rate, returning the text
/// </summary>
/// <returns></returns>
public string GetPerSecond()
{
string s = perSecond.ToString() + "/s";
perSecond = new MiniCounter();
return s;
}
/// <summary>
/// Adds bytes to the total transfered
/// </summary>
/// <param name="count">Byte count</param>
public void AddBytes(uint count)
{
// overflow max
if ((count * 8) >= Int32.MaxValue)
return;
count = 8 * count;
perSecond.AddBytes(count);
bytes += count;
while (bytes > 1024)
{
kbytes++;
bytes -= 1024;
}
while (kbytes > 1024)
{
mbytes++;
kbytes -= 1024;
}
while (mbytes > 1024)
{
gbytes++;
mbytes -= 1024;
}
while (gbytes > 1024)
{
tbytes++;
gbytes -= 1024;
}
while (tbytes > 1024)
{
pbytes++;
tbytes -= 1024;
}
}
/// <summary>
/// Prints out a relevant string for the bits transfered
/// </summary>
/// <returns></returns>
public override string ToString()
{
if (pbytes > 0)
{
double ret = (double)pbytes + ((double)((double)tbytes / 1024));
string s = ret.ToString();
if (s.Length > 6)
s = s.Substring(0, 6);
return s + " Pb";
}
else if (tbytes > 0)
{
double ret = (double)tbytes + ((double)((double)gbytes / 1024));
string s = ret.ToString();
if (s.Length > 6)
s = s.Substring(0, 6);
return s + " Tb";
}
else if (gbytes > 0)
{
double ret = (double)gbytes + ((double)((double)mbytes / 1024));
string s = ret.ToString();
if (s.Length > 6)
s = s.Substring(0, 6);
return s + " Gb";
}
else if (mbytes > 0)
{
double ret = (double)mbytes + ((double)((double)kbytes / 1024));
string s = ret.ToString();
if (s.Length > 6)
s = s.Substring(0, 6);
return s + " Mb";
}
else if (kbytes > 0)
{
double ret = (double)kbytes + ((double)((double)bytes / 1024));
string s = ret.ToString();
if (s.Length > 6)
s = s.Substring(0, 6);
return s + " Kb";
}
else
{
string s = bytes.ToString();
if (s.Length > 6)
s = s.Substring(0, 6);
return s + " b";
}
}
}
在处理传输速率的异步环境中，我们可以很好地工作。