C # OutOfMemoryException in System.Drawing.Bitmap

Question

Is there a way to get more details at runtime of an OutOfMemoryException? Or, can this exception somehow not be caught by the try / catch application and instead try / catch the above call stack? I can not play using WinDBG, so I have to register in the application.

I apologize for the long explanation, but there are many possible reasons that I explain.

I read all of the OutofMemoryException exception options and basically eliminated all of them. Usually the application works fine, but sometimes on only certain computers, I get an OutOfMemoryException. Since these reports are in a field that cannot be played locally, I only have logs. But I have quite a few details.

What is strange:

• Everything that can logically allocate memory in close proximity is in try / catch, but the exception is treated as unhandled (and falls well above the call stack).
• No StringBuffers Used
• An exception occurs even after rebooting and restarting the application.
• An exception occurs only after a couple of minutes and only about 30 megabytes of memory is allocated in pieces of no more than 1.5 MB.
• The tested application (built for "any" processor) works like 64 bits.
• There is no lack of disk space (270Gb for free) and a swap file.
• not a possible problem of LoH fragmentation.

. , .NET, , System.Web.Serialization. , , . ( ) .

, , , , . , . . :

• (System.Timers.Timer, [Statthread])
• (< 5)
• , 1MiB . MemoryStream, 2MiB. System.Drawing.Bitmap, , 8MiB. , try/catch, System.Exception. , try/catch, byte [], , .
• . , , , Small Object.
• . . .
• , , . , , ? ? , dll .
• . , .

• COM-. , , , 20 COM- (IUPnPDevice)

  // Stack Trace indicates this method is throwing the OutOfMemoryException
  // It isn't CAUGHT here, though, so not in the try/catch.
  //
  internal void Render(int w, int h)
  {
      if (bitmap != null)
      {
          bitmap.Dispose();
          bitmap = null;
      }
  
      if (!String.IsNullOrEmpty(url))
      {
      // this information is printed successfully to log, with correct url
      // exception occurs sometime AFTER this somehow.
          Logger.Default.LogInfo("Loading {0}", url);
  
      // when file contents changed (to go from 1MiB to 500MiB, the error went away)
          byte[] data = DownloadBinaryFile(url);
          if (data != null)
          {
              try
              {
                  Bitmap bmp;
                  using (var ms = new MemoryStream(data))
                  {
                      bmp = new Bitmap(ms);
                  }
                  bitmap = bmp;
              }
              catch (Exception)
              {
                  // We do not catch anything here.
                  Logger.Default.LogWarning("WARNING: Exception loading image {0}", url);
              }
          }
  
          //
          // if we had any errors, just skip this slide
          //
          if (bitmap == null)
          {
              return;
          }
  
          // QUESTION EDIT:
          // in the problematic version, there was actually an unnecessary
          // call here that turns out to be where the exception was raised:
          using( Graphics g = Graphics.FromImage(bitmap)) {
          }
  
      }
  }
  
  // calling this would trigger loading of the System.Web assembly, except
  // similar method has been called earlier that read everything. Only
  // class being used first time is the BinaryReader, which is in System.IO 
  // and already loaded.
  internal static byte[] DownloadBinaryFile(String strURL, int timeout = 30000)
  {
      try
      {
          HttpWebRequest myWebRequest = HttpWebRequest.Create(strURL) as HttpWebRequest;
  
          myWebRequest.KeepAlive = true;
          myWebRequest.Timeout = timeout;
          myWebRequest.ReadWriteTimeout = timeout;
          myWebRequest.UserAgent = "Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)";
  
          Encoding encode = System.Text.Encoding.GetEncoding("utf-8");
  
          using (HttpWebResponse myWebResponse = myWebRequest.GetResponse() as HttpWebResponse)
          {
              if (myWebResponse.StatusCode != HttpStatusCode.OK)
              {
                  Logger.Default.LogWarning("WARNING: Response {0} loading {1}", myWebResponse.StatusCode, strURL);
                  return null;
              }
  
              using (Stream receiveStream = myWebResponse.GetResponseStream())
              {
                  using (BinaryReader readStream = new BinaryReader(receiveStream))
                  {
                      // this extension method uses MemoryStream, but seems irrelevant since we don't catch anything here.
                      return readStream.ReadAllBytes();
                  }
              }
          }
      }
      catch (Exception e)
      {
          // we do not catch anything here.
          Logger.Default.LogError("ERROR: Exception {0} loading {1}", e.Message, strURL);
      }
      return null;
  }
  

, , . - OutOfMemoryException, , , , ?

.. - , OutOfMemoryException /catch, ?

Answer 1

. , , - . :

            Bitmap bmp;
            using (var ms = new MemoryStream(data))
            {
                bmp = new Bitmap(ms);
            }
            bitmap = bmp;

Bitmap :

Bitmap.

, MemoryStream . , Bitmap, -, . (EDIT: , , 1MiB, FromStream JPEG. JPEG < 1MiB . JPEG 1MiB, )

, Microsoft . , , ( http-), , , :

// Create a Bitmap object from a file.
using (var ms = new MemoryStream(data))
{
   bmp = new Bitmap(ms);
   Rectangle cloneRect = new Rectangle(0, 0, bmp.Width, bmp.Height);
   System.Drawing.Imaging.PixelFormat format = bmp.PixelFormat;
   this.bitmap = bmp.Clone(cloneRect, bmp.PixelFormat);    
}

, , , , , . Graphics.FromImage() , . , .