为什么我会发生OutOfMemoryException？

问题描述：

我有这种方法，我从计时器滴答事件每X秒调用方法。在开始的几秒钟内没有任何问题，但是在20秒后或者显示异常。为什么我会发生OutOfMemoryException？

private void ReturnTexture(Texture texture_take, List<Point> lstPnt, float[] anglArr, float angle) 
     { 
      int i, j, bytes = 2048 * 512, stride = 2048; 
      GraphicsStream textureStream; 
      byte[] rgbValues = new byte[bytes]; 

      //sets texture to complete transparent 
      GCHandle gch = GCHandle.Alloc(rgbValues, GCHandleType.Pinned); 
      MemSet(gch.AddrOfPinnedObject(), 0x0, rgbValues.Length); 

      //add 90 degrees because the cone starts at 90 
      angle += 90F + 23.75F; 

      //checks all points and draws yellow only those how are inside the cone 
      if (lstPnt != null) 
      { 
       for (i = 0; i < lstPnt.Count - 1; i++) 
       { 
        if (anglArr[i] <= angle && anglArr[i] >= angle - 47.5F) //if point angle is inside cone. Cone angle is 47.5 degrees 
        { 
         j = lstPnt[i].Y * stride + lstPnt[i].X * 4; 

         //yellow 
         rgbValues[j + 0] = (byte)0; 
         rgbValues[j + 1] = (byte)255; 
         rgbValues[j + 2] = (byte)255; 
         rgbValues[j + 3] = (byte)255; 
        } 
        else 
        { 

        } 
       } 
      }

唯一的例外是上线：

byte[] rgbValues = new byte[bytes];

当异常发生，我看到变量字节包含：1048576 而rgbValues是空

我异常之前使用断点发生并看到以字节为单位的值是相同的：1048576但异常仅在20秒左右后才发生，而不仅仅是在开始时。

类型 '的System.OutOfMemoryException' 的未处理的异常发生在天气Radar.exe

System.OutOfMemoryException was unhandled 
    HResult=-2147024882 
    Message=Exception of type 'System.OutOfMemoryException' was thrown. 
    Source=Weather Radar 
    StackTrace: 
     at Weather_Radar.Form1.ReturnTexture(Texture texture_take, List`1 lstPnt, Single[] anglArr, Single angle) in d:\C-Sharp\Weather Radar\Weather Radar\Weather Radar\Form1.cs:line 314 
     at Weather_Radar.Form1.timer1_Tick(Object sender, EventArgs e) in d:\C-Sharp\Weather Radar\Weather Radar\Weather Radar\Form1.cs:line 59 
     at System.Windows.Forms.Timer.OnTick(EventArgs e) 
     at System.Windows.Forms.Timer.TimerNativeWindow.WndProc(Message& m) 
     at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) 
     at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg) 
     at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData) 
     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 Weather_Radar.Program.Main() in d:\C-Sharp\Weather Radar\Weather Radar\Weather Radar\Program.cs:line 19 
     at System.AppDomain._nExecuteAssembly(RuntimeAssembly 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.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) 
     at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) 
     at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) 
     at System.Threading.ThreadHelper.ThreadStart() 
    InnerException:

314线在Form1是：字节[] rgbValues =新的字节[字节];

form1中的第59行是：ReturnTexture（scannedCloudsTexture，cloudPoints，angleArray，angleF）;

这是计时器滴答事件代码：

static float angle_ = 0.0F; 
     static float angleF = 0.0F; 
     private void timer1_Tick(object sender, EventArgs e) 
     { 
      if (angleF > 360F) 
      { 
       angleF -= 360F; 
      } 

      ReturnTexture(scannedCloudsTexture, cloudPoints, angleArray, angleF); 

      DisplayOnScreen(angle_); 

      angle_ += (float)(Math.PI * 1d/180d); 
      angleF += 1.0F; 
     }

的GCHandle免受垃圾收集器，所以你应该释放内存使用调用GCHandle.Free方法，当手柄没有更多必要 – InferOn 2014-09-30 07:20:19

我敢打赌，每个时钟滴答您的RAM增加。尝试重复使用您的数组，而不是在每次打勾时创建 – Reniuz 2014-09-30 07:21:27

答

正如Renuiz在评论解释说，它看起来像你不释放分配给你的形象记忆。当你拨打GCHandle.Alloc

一个新的GCHandle保护对象免受垃圾回收。当GCHandle不再需要时，必须使用Free发布。

如果你不FreeGCHandle，你的代码分配的1MB将永远不会被释放。我认为有两种可能的选择：

如果可能，重新使用byte[]，不需要更多的内存。保留GCHandle，以便您可以将它们memset以使每个勾号归零。
请勿使用GCHandle将byte[]固定在内存中。反正你创建一个新的byte[]all values will be set to zero。

为什么我会发生OutOfMemoryException？

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