C# 读取网络上下行（不要使用性能计数器的方式）
C# 读取网络上下行有多种方式，其中有一种是使用System.Net.NetworkInformation命名空间中的NetworkInterface类和PerformanceCounter类，该方式其实读的是windows系统的性能计数器中的Network Interface类别的数据。方式如下：
NetworkInterface networkInterface = NetworkInterface.GetAllNetworkInterfaces()
.FirstOrDefault(i => i.Name.Equals(interfaceName, StringComparison.OrdinalIgnoreCase));
if (networkInterface == null)
{
Console.WriteLine("Network interface not found.");
return;
}
PerformanceCounter downloadCounter = new PerformanceCounter("Network Interface", "Bytes Received/sec", networkInterface.Description);
PerformanceCounter uploadCounter = new PerformanceCounter("Network Interface", "Bytes Sent/sec", networkInterface.Description);
while (true)
{
float downloadSpeed = downloadCounter.NextValue();
float uploadSpeed = uploadCounter.NextValue();
Console.WriteLine($"Download Speed: {downloadSpeed} bytes/sec");
Console.WriteLine($"Upload Speed: {uploadSpeed} bytes/sec");
Thread.Sleep(1000); // 每秒更新一次网速
}但是使用性能计数器有时候会抛异常：
异常: System.InvalidOperationException: 类别不存在。
在 System.Diagnostics.PerformanceCounterLib.CounterExists(String machine, String category, String counter)
在 System.Diagnostics.PerformanceCounter.InitializeImpl()
在 System.Diagnostics.PerformanceCounter..ctor(String categoryName, String counterName, String instanceName, Boolean readOnly)
在 System.Diagnostics.PerformanceCounter..ctor(String categoryName, String counterName, String instanceName)打开“性能监视器”，点击“性能”，报错
使用网上的各种处理都没办法恢复，所以建议使用其它方式获取网络上下行。
下面是使用WMI (Windows Management Instrumentation)的方式（需要使用管理员身份运行）：
string interfaceName = "Ethernet"; // 指定网络接口的名称
ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT * FROM Win32_PerfFormattedData_Tcpip_NetworkInterface");
ManagementObjectCollection objects = searcher.Get();
foreach (ManagementObject obj in objects)
{
string name = obj["Name"].ToString();
if (name.Equals(interfaceName, StringComparison.OrdinalIgnoreCase))
{
ulong bytesReceived = Convert.ToUInt64(obj["BytesReceivedPerSec"]);
ulong bytesSent = Convert.ToUInt64(obj["BytesSentPerSec"]);
Console.WriteLine($"Download Speed: {bytesReceived} bytes/sec");
Console.WriteLine($"Upload Speed: {bytesSent} bytes/sec");
break;
}
} 如果再不行可能是网卡出异常了
来源:https://www.cnblogs.com/log9527blog/archive/2023/05/23/17426019.html
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