打印多页WPF控件，在一行数据上没有分页

我制作了一个发票，它的底部有一个listview来列出所有的行项目。这可以在一个页面标记上运行，所以我重载了DocumentPaginator类以允许我打印多个页面。但是，有时它会在列表视图的一行中间剪切页面。我发现一篇文章使用wpf控件的位图，然后检查一行像素的颜色以确定是否有空白或数据(下面的代码)。但是，当我将控件制作成位图时，间距和行高与我将wpf控件打印为xps或打印到打印机时不同。关于如何智能地分割页面或使位图与xps匹配，还有其他想法吗?

 private void GetGoodCut()
    {
        int goodCut = _lastCut; 
        int lastNumber = 0;
        int numberCount = 1;
        // At most, it will take 32 pixel lines to find a white space
        for (int i = 0; i < 32; i++)
        {
            int number = rowPixelWhiteCount(_bitmap, goodCut);
            goodCut--;
            if (number == lastNumber)
            {
                numberCount++;
                // White space count between LV lines is 12 
                if (numberCount == 12)
                {
                    lastNumber = i - 6;
                    break;
                }
            }
            else
            {
                // If we started inside a white space, can break if starting before/at middle of the white space
                if (numberCount > 5)
                {
                    lastNumber = i - 6;
                    break;
                }
                numberCount = 1;
            }
            lastNumber = number;
        }
        _lastCut -= lastNumber;
    }
 private int rowPixelWhiteCount(System.Drawing.Bitmap bmp, int row)
    {
        int colorCount = 0;
        System.Drawing.Imaging.BitmapData bmpData = bmp.LockBits(new System.Drawing.Rectangle(0, 0, bmp.Width, bmp.Height), System.Drawing.Imaging.ImageLockMode.ReadOnly, bmp.PixelFormat);
        int stride = bmpData.Stride;
        IntPtr firstPixelInImage = bmpData.Scan0;
        unsafe
        {
            byte* p = (byte*)(void*)firstPixelInImage;
            p += stride * row;  // find starting pixel of the specified row
            for (int column = 0; column < bmp.Width; column++)
            {
                // Printing in black/white, look for non-black pixels
                byte blue = p[0];
                byte red = p[1];
                byte green = p[3];
                if (blue > 0 && red > 0 && green > 0)
                    colorCount++;
                // go to next pixel
                p += 3;
            }
        }
        bmp.UnlockBits(bmpData);
        count.Add(colorCount);
        return colorCount;
    }