無法連接到一個VM上的網絡適配器，相同的代碼在另一個VM上工作

Question

我需要從網卡獲取性能計數器。爲了使事情變得容易，用戶通過在控制檯應用程序中輸入索引號來選擇所需的適配器。

這是獲取用戶輸入並創建性能計數器實例的代碼

var connectionNames = NetworkCardLocator.GetConnectedCardNames().ToArray(); 
log.Debug("Please select one of the available connections"); 
log.Debug("--"); 
for (int i = 0; i < connectionNames.Count(); i++) 
{ 
    log.Debug(i + ". " + connectionNames[i]); 
} 
log.Debug("--"); 
var key = Console.ReadLine(); 
int idx = 0; 
Int32.TryParse(key, out idx); 
string connectionName = connectionNames[idx]; 

var networkBytesSent = new PerformanceCounter("Network Interface", "Bytes Sent/sec", connectionName); 
var networkBytesReceived = new PerformanceCounter("Network Interface", "Bytes Received/sec", connectionName); 
var networkBytesTotal = new PerformanceCounter("Network Interface", "Bytes Total/sec", connectionName); 

這是我的選擇可用適配器

internal static IEnumerable<string> GetConnectedCardNames() 
{ 
    string query = String.Format(@"SELECT * FROM Win32_NetworkAdapter"); 
    var searcher = new ManagementObjectSearcher 
    { 
     Query = new ObjectQuery(query) 
    }; 

    try 
    { 
     log.Debug("Trying to select network adapters"); 
     var adapterObjects = searcher.Get(); 

     var names = (from ManagementObject o in adapterObjects 
         select o["Name"]) 
          .Cast<string>(); 

     return names; 
    } 
    catch (Exception ex) 
    { 
     log.Debug("Failed to get needed names, see Exception log for details"); 
     log.Fatal(ex); 
     throw; 
    } 
} 

問題
鑑於我選擇了所需的適配器，代碼在我的機器上運行（Win 2008 R2 Ent x64）。它在我用於測試的某些虛擬機上不起作用（Win 2008 R1 DC x86）。任何選擇也給了我一個例外（仍然工作在我的電腦和VM贏2008 R1標準的x86上）

foreach (PerformanceCounter counter in counters) 
{ 
    float rawValue = counter.NextValue(); //thrown here 
    ... 
} 

2011-06-10 11:08:20,505 [10] DEBUG TH.Exceptions Instance 'WAN Miniport (PPTP)' does not exist in the specified Category. 
System.InvalidOperationException: Instance 'WAN Miniport (PPTP)' 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 TH.PerformanceMonitor.API.Internal.PerformanceLogService.DoPerformanceLogging(IEnumerable`1 counters, Int32 interval, TimeSpan duration) in C:\Projects\...\PerformanceLogService.cs:line 122 
    at TH.PerformanceMonitor.API.PerformanceManager.DoPerformanceLogging() in C:\Projects\...\PerformanceManager.cs:line 294 
    at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx) 
    at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) 
    at System.Threading.ThreadHelper.ThreadStart() 

Q
可能是什麼問題，或者我怎麼可以跟蹤的原因爲何？

Answer 1

問題出在phantom network adapters。一旦他們從虛擬機中刪除，一切都開始奏效。