的System.OutOfMemoryException而執行了一個小時

Question

爲什麼我得到這個「的System.OutOfMemoryException」

這個代碼是提供的服務來讀取智能卡讀卡器的智能卡，並把結果文本框，這是焦點中的任何後應用。當它運行（超過60分鐘）我得到錯誤拋出。我的情況發生了什麼？

請指教

class Program 
    { 
     static bool infinity = true; 
     static WinSCard sCard; 

     public static void Main(string[] args) 
     { 
      try 
      { 
       sCard = new WinSCard(); 

       while (infinity) { 

        sCard.EstablishContext();     //establis smart card reader resourete manager 
        sCard.ListReaders();      //get list of smart card reader 

        string readerName = sCard.ReaderNames[0]; //the first smart card reader in the list 

        sCard.WaitForCardPresent(readerName);  //block execution until smart card was attached to the reader 
        sCard.Connect(readerName);     //connect to a smart card 

//     Console.WriteLine("ATR: 0x" + sCard.AtrString); 


        byte[] cmdApdu = { 0xFF, 0xCA, 0x00, 0x00, 00 }; // get card UID ... 
        byte[] respApdu = new byte[6]; 
        int respLength = respApdu.Length; 

        //submit command to smart card and get a return result 
        sCard.Transmit(cmdApdu, cmdApdu.Length, respApdu, ref respLength); 

        //Convert Bute[] to HexString and finally Integer 
        int num = Int32.Parse(ByteArrayToString(respApdu, respLength), System.Globalization.NumberStyles.HexNumber); 
        Console.WriteLine("GET CARD UID ==> " + num); 

        //Send Result to any input that currently got focus 
        SendKeys.SendWait(num.ToString()); 

        sCard.WaitForCardRemoval(readerName); //block execution until smart card was removed to the reader 
        sCard.Disconnect();      //terminated connection to a smart card 
        sCard.ReleaseContext();     //freely any resource allocated under the context 
       } 
      } 
      catch (WinSCardException ex) 
      { 
       Console.WriteLine(ex.WinSCardFunctionName + " 0x" + ex.Status.ToString("X08") + " " + ex.Message); 
      } 
      finally 
      { 
       Console.WriteLine("Please press any key..."); 
       Console.ReadLine(); 
      } 
     } 

     public static string ByteArrayToString(byte[] ba, int length) 
     { 
      StringBuilder hex = new StringBuilder(length * 2); 
      foreach (byte b in ba) 
       hex.AppendFormat("{0:x2}", b); 
      return hex.ToString().Replace("9000",""); 
     } 
    } 

Answer 1

請看看我的調試內存溢出異常有關的下列反應，也可能是一些幫助，有一些工具可以幫助你查明內存泄漏的代碼。

When I use Socket.IO, why I got an error An unhandled exception of type 'System.OutOfMemoryException'

Answer 2

我的猜測是，sCard.ListReaders（）會導致您的問題，所以我會在更多的細節有分析代碼。我假設有一些內部集合，它永遠不會被清理，你的sCard是靜態變量。您可以調試/寫入單元測試或使用內存分析工具，如ANTS Memory Profiler（創建初始快照，然後在10分鐘後比較哪個實例消耗內存）

Answer 3

您的代碼中是否有任何類實現IDisposable和你不是在處理它們，或者是它們的任何PInvoke調用，它們需要額外的調用來清除它們分配的任何內存。

Answer 4

它可以幫助您不要在您的循環中重用您的WinSCard對象。只需在每一個開始處創建一個新實例。 而且你不需要把這個對象放到一個靜態成員上，把它用作局部變量。

public static void Main(string[] args) 
    { 
     try 
     { 
      while (infinity) { 

       var sCard = new WinSCard(); 

       sCard.EstablishContext();     //establis smart card reader resourete manager 
       sCard.ListReaders();      //get list of smart card reader 

如果WinSCard工具IDisposable在using語句把它包起來，以確保以釋放潛在的不超過所使用的資源：

   using(var sCard = new WinSCard()) 
       { 
        sCard.EstablishContext();     //establis smart card reader resourete manager 
        sCard.ListReaders();      //get list of smart card reader