c＃image使用新位图vs绘制图像调整大小

问题描述

有什么区别？



位图newImage =新位图（_ currentBitmap，newWidth，newHeight）;

返回newImag;



AND



位图animage =新位图（newWidth，newHeight）;

使用（Graphics gr = Graphics.FromImage（animage））

{

gr.SmoothingMode = SmoothingMode.HighQuality;

gr.InterpolationMode = InterpolationMode .HighQualityBicubic;

gr.PixelOffsetMode = PixelOffsetMode.HighQuality;

gr.CompositingQuality = CompositingQuality.HighQuality;

gr.DrawImage（_ currentBitmap，new Rectangle（0,0，newWidth，newHeight））;

}

返回animage;

what is the difference?

Bitmap newImage = new Bitmap(_currentBitmap, newWidth, newHeight);
return newImag;

AND

Bitmap animage= new Bitmap( newWidth, newHeight);
using (Graphics gr = Graphics.FromImage(animage))
{
gr.SmoothingMode = SmoothingMode.HighQuality;
gr.InterpolationMode = InterpolationMode.HighQualityBicubic;
gr.PixelOffsetMode = PixelOffsetMode.HighQuality;
gr.CompositingQuality = CompositingQuality.HighQuality;
gr.DrawImage(_currentBitmap, new Rectangle(0, 0, newWidth, newHeight));
}
return animage;

推荐答案

public Bitmap(Image original, int width, int height) : this(width, height) {
            Graphics g = null;
            try {
                g = Graphics.FromImage(this);
                g.Clear(Color.Transparent);
                g.DrawImage(original, 0, 0, width, height);
            }
            finally {
                if (g != null) {
                    g.Dispose();
                }
            }
        }

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