App_Code/common2/common/Images.cs

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using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
using System.IO;

namespace RM.Common
{
    public class Images
    {

        public static Image GetFromStream(Stream fileStream)
        {            
            Image Img = Image.FromStream(fileStream);            
            return Img;
        }

        public static Image GetFromFile(string filePath)
        {
            Image Img = Image.FromFile(filePath);
            return Img;
        }

        #region//IsImgFitSize:判断图片是否适合比例.
        public static bool IsImgFitSize(Image Img ,int maxWidth, int maxHeight)
        {
            return (Img.Width <= maxWidth && Img.Height <= maxHeight);
        }

        public static bool IsImgFitSize(Stream fileStream, int maxWidth, int maxHeight)
        {
            Image Img = GetFromStream(fileStream);
            return IsImgFitSize(Img, maxWidth, maxHeight);
        }

        public static bool IsImgFitSize(string filePath, int maxWidth, int maxHeight)
        {
            Image Img = GetFromFile(filePath);
            return IsImgFitSize(Img, maxWidth, maxHeight);
        }
        #endregion        

        #region//SetImageResize:重新设置图片大小统一保存成JPG格式.
        public static void SetImageResize(Image Img, string strFileName, int maxWidth, int maxHeight)
        {
            if (Img.Width > maxWidth || Img.Height > maxHeight)
            {
                int oWidth = Img.Width; //原图宽度 
                int oHeight = Img.Height; //原图高度 

                //按比例计算出缩略图的宽度和高度 
                if (oWidth >= oHeight)
                {
                    maxHeight = (int)Math.Floor(Convert.ToDouble(oHeight) * (Convert.ToDouble(maxWidth) / Convert.ToDouble(oWidth)));
                }
                else
                {
                    maxWidth = (int)Math.Floor(Convert.ToDouble(oWidth) * (Convert.ToDouble(maxHeight) / Convert.ToDouble(oHeight)));
                }
                ////Img = Img.GetThumbnailImage(maxWidth, maxHeight, null, IntPtr.Zero);