当插入多个网卡时，我遇到了win应用程序的问题我该怎么办？
这是错误：
System.InvalidOperationException: Instance 'Citrix XenServer PV Ethernet Adapter #2' does not exist in the specified Category.
at System.Diagnostics.CounterDefinitionSample.GetInstanceValue(String instanceName)
at System.Diagnostics.PerformanceCounter.NextSample()
at System.Diagnostics.PerformanceCounter.NextValue()
at CurrencyApp.Converter.timerMemProcNetwork_Tick(Object sender, EventArgs e)
at System.Windows.Forms.Timer.OnTick(EventArgs e)
at System.Windows.Forms.Timer.TimerNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
整个应用代码：
public partial class Converter : Form
{
#region Properties
private int NumOfRepeats;
private int NumberOfErrorRows;
private int NumberOfUpdatedRows;
private int NumberofNewRows;
private string Status;
private PerformanceCounter counterReceived;
private PerformanceCounter counterSent;
private PerformanceCounter cpuCounter;
private int nByteCountReceive;
private int nByteCountSend;
private int nCPUUsage;
private int nFirstTimeCheckConnection;
private float nFreeMemory;
private PerformanceCounter ramCounter;
private int ByteCountReceive
{
get { return nByteCountReceive; }
set
{
nByteCountReceive = value;
statusBarPanelByteReceive.Text = "Receive:" + Commas(nByteCountReceive/1024 + 1) + " KB";
}
}
private int ByteCountSend
{
get { return nByteCountSend; }
set
{
nByteCountSend = value;
statusBarPanelByteSend.Text = "Send:" + Commas(nByteCountSend/1024 + 1) + " KB";
}
}
private float FreeMemory
{
get { return nFreeMemory; }
set
{
nFreeMemory = value;
statusBarPanelMem.Text = nFreeMemory + " Mb Available";
}
}
private int CPUUsage
{
get { return nCPUUsage; }
set
{
nCPUUsage = value;
statusBarPanelCPU.Text = "CPU usage " + nCPUUsage + "%";
}
}
private static IDaoFactory DaoFactory
{
get { return new NHibernateDaoFactory(ConfigurationManager.AppSettings["NHibernateConfigPath"]); }
}
#endregion
#region Methods
public Converter()
{
InitializeComponent();
InitialiseCounterRamNetwork();
InitializeBackgroundWorker();
}
[DllImport("wininet")]
private static extern int InternetGetConnectedState(ref int lpdwFlags, int dwReserved);
[DllImport("wininet")]
private static extern int InternetAutodial(int dwFlags, int hwndParent);
private static string InternetGetConnectedStateString()
{
string strState = "";
try
{
int nState = 0;
// check internet connection state
if (InternetGetConnectedState(ref nState, 0) == 0)
return "You are currently not connected to the internet";
if ((nState & 1) == 1)
strState = "Modem connection";
else if ((nState & 2) == 2)
strState = "LAN connection";
else if ((nState & 4) == 4)
strState = "Proxy connection";
else if ((nState & 8) == 8)
strState = "Modem is busy with a non-Internet connection";
else if ((nState & 0x10) == 0x10)
strState = "Remote Access Server is installed";
else if ((nState & 0x20) == 0x20)
return "Offline";
else if ((nState & 0x40) == 0x40)
return "Internet connection is currently configured";
// get current machine IP
string strHostName = Dns.GetHostName();
string ip = "/";
IPAddress[] addrs = Dns.GetHostAddresses(strHostName);
foreach (var addr in addrs)
{
if (addr.AddressFamily.ToString() == "InterNetwork")
{
ip = addr.ToString();
}
}
strState += ", Machine IP: " + ip;
}
catch (Exception ex)
{
return ex.ToString();
}
return strState;
}
private void ConnectionInfo()
{
try
{
int nState = 0;
if (InternetGetConnectedState(ref nState, 0) == 0)
{
if (nFirstTimeCheckConnection++ == 0)
// ask for dial up or DSL connection
if (InternetAutodial(1, 0) != 0)
// check internet connection state again
InternetGetConnectedState(ref nState, 0);
}
if ((nState & 2) == 2 || (nState & 4) == 4)
// reset to reask for connection agina
nFirstTimeCheckConnection = 0;
statusBarPanelInfo.Text = InternetGetConnectedStateString();
}
catch (Exception ex)
{
statusBarPanelInfo.Text = ex.ToString();
}
}
private void InitialiseCounterRamNetwork()
{
cpuCounter = new PerformanceCounter("Processor", "% Processor Time", "_Total", true);
ramCounter = new PerformanceCounter("Memory", "Available MBytes", true);
string instance = "MS TCP Loopback interface";
NetworkInterface[] nics = NetworkInterface.GetAllNetworkInterfaces();
foreach (NetworkInterface nic in nics)
{
if (nic.Description == "MS TCP Loopback interface")
continue;
if (nic.OperationalStatus.ToString() == "Up")
{
instance = nic.Description;
break;
}
}
counterReceived = new PerformanceCounter("Network Interface", "Bytes Received/sec", instance);
counterSent = new PerformanceCounter("Network Interface", "Bytes Sent/sec", instance);
}
private void btnStartCurrencyConverter_Click(object sender, EventArgs e)
{
NumOfRepeats = 0;
NumberOfErrorRows = 0;
NumberofNewRows = 0;
NumberOfUpdatedRows = 0;
txtStatus.Text = "Start: " + DateTime.Now + Environment.NewLine;
lblNumberOfUpdatedRows.Text = NumberOfUpdatedRows.ToString();
lblNumberofNewRows.Text = NumberofNewRows.ToString();
btnStartCurrencyConverter.Enabled = false;
btnCancel.Enabled = true;
if (!bwCrawler.IsBusy)
bwCrawler.RunWorkerAsync();
}
private static string Commas(int nNum)
{
string str = nNum.ToString();
int nIndex = str.Length;
while (nIndex > 3)
{
str = str.Insert(nIndex - 3, ",");
nIndex -= 3;
}
return str;
}
private void InitializeBackgroundWorker()
{
bwCrawler.DoWork += bwCrawler_DoWork;
bwCrawler.ProgressChanged += bwCrawler_ProgressChanged;
bwCrawler.WorkerReportsProgress = true;
bwCrawler.WorkerSupportsCancellation = true;
}
private void CurrencImport()
{
CurrencyConvertorSoapClient client = new CurrencyConvertorSoapClient();
string[] curr1 = Enum.GetNames(typeof (Currency));
string[] curr2 = Enum.GetNames(typeof (Currency));
int i = 0;
int j = 0;
int workComplete = curr1.Length*curr2.Length;
int workDone = 0;
decimal percentComplete = 0;
foreach (var c1 in curr1)
{
foreach (var c2 in curr2)
{
start_of_loop:
{
}
try
{
Currency cEnum1 = (Currency) Enum.Parse(typeof (Currency), c1);
Currency cEnum2 = (Currency) Enum.Parse(typeof (Currency), c2);
double rate = client.ConversionRate(cEnum1, cEnum2);
ICurrenciesDao currenciesDao = DaoFactory.GetCurrenciesDao();
Currencies currencyExist = currenciesDao.GetConversionRateByFromCurrencyToCurrency(c1, c2);
if (currencyExist != null)
{
// update if row exist
currencyExist.ConversionRate = Convert.ToDecimal(rate);
currenciesDao.SaveOrUpdate(currencyExist);
currenciesDao.CommitChanges();
i++;
NumberOfUpdatedRows = i;
}
else
{
// write new row
Currencies currencyNew = new Currencies(c1, c2, Convert.ToDecimal(rate), DateTime.Now);
currenciesDao.Save(currencyNew);
currenciesDao.CommitChanges();
j++;
NumberofNewRows = j;
}
Status = c1 + " - " + c2 + ": " + rate;
}
catch (Exception ex)
{
Thread.Sleep(200000);
if (NumOfRepeats > 50)
{
Status = ex.ToString();
NumberOfErrorRows = 1;
}
else
goto start_of_loop;
}
if (bwCrawler.CancellationPending)
break;
workDone++;
percentComplete = (workDone/workComplete)*100;
bwCrawler.ReportProgress(Convert.ToInt32(percentComplete));
NumOfRepeats = 0;
if (percentComplete == 100)
break;
}
if (bwCrawler.CancellationPending)
break;
if (percentComplete == 100)
break;
}
}
private void btnCancel_Click(object sender, EventArgs e)
{
if (bwCrawler.IsBusy)
{
//Initiate cancel
bwCrawler.CancelAsync();
}
btnCancel.Enabled = false;
btnStartCurrencyConverter.Enabled = true;
txtStatus.AppendText("Canceled: " + DateTime.Now + Environment.NewLine);
}
private void bwCrawler_DoWork(object sender, DoWorkEventArgs e)
{
CurrencImport();
}
private void bwCrawler_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
btnCancel.Enabled = false;
btnStartCurrencyConverter.Enabled = true;
if (e.Cancelled)
{
txtStatus.AppendText("Canceled" + Environment.NewLine);
}
else if (e.Error != null)
{
txtStatus.AppendText("Error. Details: " + (e.Error) + Environment.NewLine);
}
else
{
txtStatus.AppendText("Finished: " + DateTime.Now + Environment.NewLine);
}
}
private void bwCrawler_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
if (NumberOfErrorRows > 0)
{
if (bwCrawler.IsBusy)
{
//Initiate cancel
bwCrawler.CancelAsync();
}
}
lblNumberOfUpdatedRows.Text = NumberOfUpdatedRows.ToString();
lblNumberofNewRows.Text = NumberofNewRows.ToString();
txtStatus.AppendText(Status + Environment.NewLine);
if (txtStatus.Text.Split(new[] { Environment.NewLine }, StringSplitOptions.None).Length > 200)
{
txtStatus.Text = string.Empty;
}
}
private void timerConnectionInfo_Tick(object sender, EventArgs e)
{
ConnectionInfo();
}
private void timerMemProcNetwork_Tick(object sender, EventArgs e)
{
FreeMemory = ramCounter.NextValue();
CPUUsage = Convert.ToInt32(cpuCounter.NextValue());
ByteCountReceive = Convert.ToInt32(counterReceived.NextValue());
ByteCountSend = Convert.ToInt32(counterSent.NextValue());
}
#endregion
}
答案 0 :(得分：2)
您正在阅读一个性能计数器，您为其指定了一个不存在的实例。从实例名称判断，您尝试阅读“网络接口”类别。确保在正确的机器上阅读了正确的类别。发布初始化timerMemProcNetwork_Tick中引用的性能计数器对象的代码。
NetworkInterface[] nics = NetworkInterface.GetAllNetworkInterfaces();
foreach (NetworkInterface nic in nics)
{
...
counterReceived = new PerformanceCounter("Network Interface", "Bytes Received/sec", instance);
...
}
此代码混合苹果和橙子。使用“网络接口”类别上的PerformanceCounterCategory.GetInstanceNames获取有效实例列表。