我正在使用以下代码来检测我的PC上的网络接口卡的名称。我正在使用USB调制解调器。
public class DetectNIC
{
public string ReturnNIC()
{
List<NetworkInterface> Interfaces = new List<NetworkInterface>();
foreach (var nic in NetworkInterface.GetAllNetworkInterfaces())
{
if (nic.OperationalStatus == OperationalStatus.Up)
{
Interfaces.Add(nic);
}
}
NetworkInterface result = null;
foreach (NetworkInterface nic in Interfaces)
{
if (result == null)
{
result = nic;
}
else
{
if (nic.GetIPProperties().GetIPv4Properties() != null)
{
if (nic.GetIPProperties().GetIPv4Properties().Index < result.GetIPProperties().GetIPv4Properties().Index)
result = nic;
}
}
}
return result.Name.ToString();
}
}
我将结果传递给下面给定的类来计算互联网流量期间的字节消耗：
public class ByteCounter
{
public double GetNetworkUtilization(string networkCard)
{
const int numberOfIterations = 10;
PerformanceCounter bandwidthCounter =
new PerformanceCounter("Network Interface", "Current Bandwidth", networkCard);
float bandwidth = bandwidthCounter.NextValue();
PerformanceCounter dataSentCounter =
new PerformanceCounter("Network Interface", "Bytes Sent/sec", networkCard);
PerformanceCounter dataReceivedCounter =
new PerformanceCounter("Network Interface", "Bytes Received/sec", networkCard);
float sendSum = 0;
float receiveSum = 0;
for (int index = 0; index < numberOfIterations; index++)
{
sendSum += dataSentCounter.NextValue();
receiveSum += dataReceivedCounter.NextValue();
}
float dataSent = sendSum;
float dataReceived = receiveSum;
double utilization = (8 * (dataSent + dataReceived)) / (bandwidth * numberOfIterations) * 100;
return utilization;
}
}
第一个代码工作正常。它将我的调制解调器检测为“MBlaze USB调制解调器”，但是当控件到达第二个代码时，后续行：
float bandwidth = bandwidthCounter.NextValue();
显示错误：
System.InvalidOperationException was unhandled
Message="Instance 'MBlaze USB Modem' does not exist in the specified Category."
Source="System"
StackTrace:
at System.Diagnostics.CounterDefinitionSample.GetInstanceValue(String instanceName)
at System.Diagnostics.PerformanceCounter.NextSample()
at System.Diagnostics.PerformanceCounter.NextValue()
at LogTraffic.ByteCounter.GetNetworkUtilization(String networkCard) in F:\Projects\LogTraffic\bytecounter.cs:line 15
at LogTraffic.MainForm.MainForm_Load(Object sender, EventArgs e) in F:\Projects\LogTraffic\MainForm.cs:line 24
at System.Windows.Forms.Form.OnLoad(EventArgs e)
at System.Windows.Forms.Form.OnCreateControl()
at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible)
at System.Windows.Forms.Control.CreateControl()
at System.Windows.Forms.Control.WmShowWindow(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
at System.Windows.Forms.ContainerControl.WndProc(Message& m)
at System.Windows.Forms.Form.WmShowWindow(Message& m)
at System.Windows.Forms.Form.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.SafeNativeMethods.ShowWindow(HandleRef hWnd, Int32 nCmdShow)
at System.Windows.Forms.Control.SetVisibleCore(Boolean value)
at System.Windows.Forms.Form.SetVisibleCore(Boolean value)
at System.Windows.Forms.Control.set_Visible(Boolean value)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.Run(Form mainForm)
at LogTraffic.Program.Main() in F:\Projects\LogTraffic\Program.cs:line 18
at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
InnerException:
有什么问题？
我不会忘记将这两个代码的作者都归功于。
第一个代码来源：Keyvan Nayyeri
答案 0 :(得分：4)
我修改了我的网卡查找代码以返回result.Description而不是result.Name。这应该提供用作InstanceName的完整接口名称。
Windows会替换特殊字符，所以你应该知道这一点。可以在PerformanceCounter.InstanceName属性的MSDN页面找到。
我还对Keyvan Nayyeri的代码进行了一些修改，以调整输入字符串以匹配预期的实例名称。另外，我将Aliostad的代码用于搜索匹配名称的类别，但是如果InstanceName不存在，我只会抛出异常。
public double GetNetworkUtilization(string networkCard)
{
const int numberOfIterations = 10;
// Condition networkCard;
networkCard = networkCard.Replace("\\", "_");
networkCard = networkCard.Replace("/", "_");
networkCard = networkCard.Replace("(", "[");
networkCard = networkCard.Replace(")", "]");
networkCard = networkCard.Replace("#", "_");
PerformanceCounterCategory NetworkInterfaceCatagory =
PerformanceCounterCategory.GetCategories().Where(c => c.CategoryName.Equals("Network Interface")).FirstOrDefault();
//// DEBUG: Check this array to see if the network card exists
//foreach(string instance in NetworkInterfaceCatagory.GetInstanceNames())
//{
// System.Diagnostics.Debug.Print(instance);
//}
if (string.IsNullOrEmpty(NetworkInterfaceCatagory.GetInstanceNames().Where(i => i.Equals(networkCard)).FirstOrDefault()))
throw new ApplicationException("NIC does not exist in existing performance counters");
string instanceName = networkCard;
PerformanceCounter bandwidthCounter =
new PerformanceCounter("Network Interface", "Current Bandwidth", instanceName);
PerformanceCounter dataSentCounter =
new PerformanceCounter("Network Interface", "Bytes Sent/sec", instanceName);
PerformanceCounter dataReceivedCounter =
new PerformanceCounter("Network Interface", "Bytes Received/sec", instanceName);
float bandwidth = bandwidthCounter.NextValue();
float sendSum = 0;
float receiveSum = 0;
for (int index = 0; index < numberOfIterations; index++)
{
sendSum += dataSentCounter.NextValue();
receiveSum += dataReceivedCounter.NextValue();
}
float dataSent = sendSum;
float dataReceived = receiveSum;
double utilization = (8 * (dataSent + dataReceived)) / (bandwidth * numberOfIterations) * 100;
return utilization;
}
答案 1 :(得分：2)
您的问题是实例名称与您从ReturnNIC获得的名称有点不同，而您使用的是netwrokCard所有地方。我已经修改了一些代码，现在它适用于我：
public static double GetNetworkUtilization(string networkCard)
{
const int numberOfIterations = 10;
PerformanceCounterCategory category = null;
foreach (var performanceCounterCategory in PerformanceCounterCategory.GetCategories())
{
if (performanceCounterCategory.CategoryName == "Network Interface")
{
category = performanceCounterCategory;
break;
}
}
string instanceName = category.GetInstanceNames().Where(x=>x.Contains(networkCard)).FirstOrDefault();
PerformanceCounter bandwidthCounter =
new PerformanceCounter("Network Interface", "Current Bandwidth", instanceName);
float bandwidth = bandwidthCounter.NextValue();
PerformanceCounter dataSentCounter =
new PerformanceCounter("Network Interface", "Bytes Sent/sec", instanceName);
PerformanceCounter dataReceivedCounter =
new PerformanceCounter("Network Interface", "Bytes Received/sec", instanceName);
float sendSum = 0;
float receiveSum = 0;
for (int index = 0; index < numberOfIterations; index++)
{
sendSum += dataSentCounter.NextValue();
receiveSum += dataReceivedCounter.NextValue();
}
float dataSent = sendSum;
float dataReceived = receiveSum;
double utilization = (8 * (dataSent + dataReceived)) / (bandwidth * numberOfIterations) * 100;
return utilization;
}
答案 2 :(得分：0)
根据MSDN system.diagnostics.performancecounter.nextvalue
提供的代码 // If the category does not exist, create the category and exit.
// Performance counters should not be created and immediately used.
// There is a latency time to enable the counters, they should be created
// prior to executing the application that uses the counters.
// Execute this sample a second time to use the category.
您似乎没有创建类别，也没有等待性能计数器在读取数据之前收集数据的持续时间。