当重叠两个相同大小的图像时,一个是偏移

您可以使用

g.DrawImageUnscaledAndClipped(topimage, New Rectangle(0, 0, 24, 24))

而是在绘制源图像时避免源图像的任何缩放。这是有效的,但我实际上不太确定你的解决方案有什么问题。

从 Reference Source , DrawImageUnscaledAndClipped 似乎在使用 Pixel 作为图像大小的默认单位,因此忽略源图像的DPI设置:

/// <include file='doc\Graphics.uex' path='docs/doc[@for="Graphics.DrawImageUnscaledAndClipped"]/*' />
/// <devdoc>
/// </devdoc>
public void DrawImageUnscaledAndClipped(Image image, Rectangle rect) {
    if(image == null) {
        throw new ArgumentNullException("image");
    }

    int width = Math.Min(rect.Width, image.Width);
    int height = Math.Min(rect.Height, image.Height);

    //We could put centering logic here too for the case when the image is smaller than the rect
    DrawImage(image, rect, 0, 0, width, height, GraphicsUnit.Pixel);
}

DrawImage 和 DrawImageUnscaled 不要,然后可能会根据其内部DPI设置重新缩放图像,Matt发现该设置小于默认值96,这会导致图像拉伸:

/// <include file='doc\Graphics.uex' path='docs/doc[@for="Graphics.DrawImageUnscaled"]/*' />
/// <devdoc>
/// </devdoc>
public void DrawImageUnscaled(Image image, Point point) {
    DrawImage(image, point.X, point.Y);
}