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C#的Graphics的GetHdc的释放问题

当我用Graphics的GetHdc时,结束的时候无论我用ReleaseHdc(),还是ReleaseHdc(hDC),还是ReleaseHdcInternal(hDc),内存都不能释放。代码如下:
Graphics g = Graphics.FromImage(bmp);
IntPtr destDC = g.GetHdc();
//g.ReleaseHdc();
//g.ReleaseHdcInternal(destDC);
g.ReleaseHdc(destDC);
g.Dispose();
麻烦问一下谁知道这是为什么呢?


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