System.ComponentModel.Win32Exception:操作已成功完成 [英] System.ComponentModel.Win32Exception: The operation completed successfully
问题描述
我收到此异常,有时运行时,我的Windows窗体应用程序很长一段时间:
I am getting this exception sometimes while running my Windows Forms app for a long time:
System.ComponentModel.Win32Exception: The operation completed successfully
at System.Drawing.BufferedGraphicsContext.CreateCompatibleDIB(IntPtr hdc, IntPtr hpal, Int32 ulWidth, Int32 ulHeight, IntPtr& ppvBits)
at System.Drawing.BufferedGraphicsContext.CreateBuffer(IntPtr src, Int32 offsetX, Int32 offsetY, Int32 width, Int32 height)
at System.Drawing.BufferedGraphicsContext.AllocBuffer(Graphics targetGraphics, IntPtr targetDC, Rectangle targetRectangle)
at System.Drawing.BufferedGraphicsContext.AllocBufferInTempManager(Graphics targetGraphics, IntPtr targetDC, Rectangle targetRectangle)
at System.Drawing.BufferedGraphicsContext.Allocate(IntPtr targetDC, Rectangle targetRectangle)
at System.Windows.Forms.Control.WmPaint(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.DataGridView.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
可能是什么原因呢?
What could be the cause for this?
推荐答案
只是为了概括起来讲,自定义网格我写的,是基于.NET的DataGridView中,使用自定义code绘制细胞。在我的网格行可以跨多个可视页面。 (这是一个业务需求)
Just to sum it up, the custom grid I wrote, that is based on the .Net's DataGridView, uses custom code to draw cells. Rows in my grid can span multiple visual pages. (That was a business requirement)
的问题是,净$ P $对 - 分配存储缓冲器,用于控制与DoubleBuffering启用。对于DataGridViews网格上的缓冲区需要相当大,以适应电网可能较大的行。在极端的情况下,一排可以跨越高达32000像素(因为一个.NET限制)。网格宽度在项目通常是500和800像素之间。 因此,所产生的缓冲即可(32bpp的* 800 * 32000 =〜100MB)
The problem was that .Net pre-allocates a buffer of memory for controls with DoubleBuffering enabled. For DataGridViews grids the buffer needs to be rather large to accommodate possible large rows in the grid. In extreme cases a row can span up to 32000 pixels (because of a .net limitation). Grid widths in the project are usually between 500 and 800 pixels. So the resulting buffer can be (32bpp * 800 * 32000 = ~100MB)
因此,在短期中,系统不能创建兼容的图形对象,因为偶尔,它不能保留的缓冲器足够大,以适应所需的数据。
So in short, the system could not create compatible graphics objects, because occasionally, it could not reserve a buffer large enough to fit the required data.
要解决它,我已经向大家介绍了一系列的优化:
To fix it I had to introduce a series of optimizations:
- 在我的自定义网格允许1500像素的限制最大行高
- 更新缓冲区重新分配code到只执行时,新缓冲区大小大于现有的
- 确保了缓冲区不重新分配与每一个数据绑定和preallocated到一个合理的规模。
- 在审查了所有code和确信,非托管资源的正确不使用时,建议在这里设置,:<一href="http://nomagichere.blogspot.com/2008/03/systemcomponentmodelwin32exception-is.html">http://nomagichere.blogspot.com/2008/03/systemcomponentmodelwin32exception-is.html
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