如何在Windows操作系统上获取网卡流量？

在Windows操作系统上获取网卡流量通常会涉及网络适配器的性能监视器API或者第三方库。Windows内置了Performance Counters（性能计数器），可以用来监控网络接口的流量情况。以下是一个使用`WMI（Windows Management Instrumentation）`的简单示例，通过.NET Framework的`ManagementObjectSearcher`来获取网络接口的发送和接收字节数：

using System;
using System.Management;

public class NetworkTrafficMonitor
{
    public static void Main()
    {
        string[] networkInterfaces = GetNetworkInterfaces();
        foreach (string nic in networkInterfaces)
        {
            MonitorNetworkTraffic(nic);
        }
    }

    private static string[] GetNetworkInterfaces()
    {
        ManagementClass networkAdapterClass = new ManagementClass("\\\\\\.\\root\\cimv2\\sysman\\embedded\\MSFT_NetAdapter");
        ManagementObjectSearcher adapterSearcher = new ManagementObjectSearcher(networkAdapterClass.GetPath(), "Name='Ethernet*'"); // 更改'Ethernet*'为你想监测的网卡名称

        var adapters = adapterSearcher.Get();
        string[] interfaceNames = new string[adapters.Count];
        for (int i = 0; i < adapters.Count; i++)
        {
            interfaceNames[i] = ((ManagementBaseObject)adapters[i]).Properties["Name"].Value.ToString();
        }

        return interfaceNames;
    }

    private static void MonitorNetworkTraffic(string nic)
    {
        try
        {
            ManagementObject trafficCounter = new ManagementObject($"\\\\\\.\\root\\cimv2\\Win32_PerfFormattedData_Tcpip_NetworkInterface({nic})");
            PerformanceCounterBytesReceived counterBytesReceived = trafficCounter.GetPerformanceCounter("BytesReceived/sec");
            PerformanceCounterBytesSent counterBytesSent = trafficCounter.GetPerformanceCounter("BytesSent/sec");

            Console.WriteLine($"{nic}: Bytes Received = {counterBytesReceived.RawValue}, Bytes Sent = {counterBytesSent.RawValue}");
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Error monitoring '{nic}': {ex.Message}");
        }
    }
}

此代码首先找到所有名为"Ethernet*"（请替换为你实际的网卡名）的网络接口，然后持续读取每个接口的发送和接收字节速率。注意在生产环境中，可能需要处理异常和定时刷新数据。