假定在Image控件中想把图片的宽度显示为固定值600，超出600的压缩显示宽高，不足600的原图显示：
FileStream fs = new FileStream(Server.MapPath(txtPicUrl), FileMode.Open, FileAccess.Read); --txtPicUrl为图片在服务器上的物理路径如：~\Pic
System.Drawing.Image image = System.Drawing.Image.FromStream(fs);
int width = Convert.ToInt32(image.Width.ToString());
double height = Convert.ToInt32(image.Height.ToString());
if (width > 600)
{
height = Math.Round(height * 600 / width);
}
this.img.ImageUrl =txtPicUrl;
this.img.Width = 600;
this.img.Height = (int)height;
img为.aspx文件界面中Image控件的ID
FileStream fs = new FileStream(Server.MapPath(txtPicUrl), FileMode.Open, FileAccess.Read); --txtPicUrl为图片在服务器上的物理路径如：~\Pic
System.Drawing.Image image = System.Drawing.Image.FromStream(fs);
int width = Convert.ToInt32(image.Width.ToString());
double height = Convert.ToInt32(image.Height.ToString());
if (width > 600)
{
height = Math.Round(height * 600 / width);
}
this.img.ImageUrl =txtPicUrl;
this.img.Width = 600;
this.img.Height = (int)height;
img为.aspx文件界面中Image控件的ID
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/26189725/viewspace-1432961/ ，如需转载，请注明出处，否则将追究法律责任。
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