我有一个缩小网站图像的方法,具体如下:
:我正在处理的一个网站
static byte[] createSmallerImage(
BlogPhoto blogPhoto,
int newMaxWidth,
int newMaxHeight)
{
Image img;
using (MemoryStream originalImage =
new MemoryStream(blogPhoto.BlogPhotoImage))
{
img = Image.FromStream(originalImage);
}
int newWidth;
int newHeight;
byte[] arr;
if (img.Width > img.Height)
{
if (img.Width <= newMaxWidth)
{
using (MemoryStream thumbStr = new MemoryStream())
{
img.Save(thumbStr, ImageFormat.Jpeg);
img.Dispose();
arr = thumbStr.ToArray();
}
return arr;
}
newWidth = newMaxWidth;
newHeight =
(int)(((float)newWidth / (float)img.Width) * (float)img.Height);
}
else
{
if (img.Height <= newMaxHeight)
{
using (MemoryStream thumbStr = new MemoryStream())
{
img.Save(thumbStr, ImageFormat.Jpeg);
img.Dispose();
arr = thumbStr.ToArray();
}
return arr;
}
newHeight = newMaxHeight;
newWidth =
(int)(((float)newHeight / (float)img.Height) * (float)img.Width);
}
Image thumb = new Bitmap(newWidth, newHeight);
Graphics g = Graphics.FromImage(thumb);
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.SmoothingMode = SmoothingMode.HighQuality;
g.PixelOffsetMode = PixelOffsetMode.HighQuality;
g.CompositingQuality = CompositingQuality.HighQuality;
g.DrawImage(img, 0f, 0f, (float)newWidth, (float)newHeight);
using (MemoryStream thumbStr = new MemoryStream())
{
thumb.Save(thumbStr, ImageFormat.Jpeg);
arr = thumbStr.ToArray();
}
g.Dispose();
img.Dispose();
return arr;
}
大部分时间它工作得很好,但有时会出现这个异常:GDI+ 中发生一般性错误。错误代码为 -2147467259。源:“System.Drawing”。这发生在 Image.Save(...) 上。我试图尽可能地让这段代码具有防御性,但仍然不知道原因。如果有人知道答案那就太好了,或者欢迎提出批评意见。