cs/img_slt.cs

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using System;
using System.Collections.Generic;
using System.Web;
using System.Drawing;

namespace web
{
    public class img_slt
    {
        private static HttpContext context = HttpContext.Current;
        /// <summary>
        /// 生成缩略图
        /// </summary>
        /// <param name="originalImagePath">源图路径（物理路径）</param>
        /// <param name="thumbnailPath">缩略图路径（物理路径）</param>
        /// <param name="width">缩略图宽度</param>
        /// <param name="height">缩略图高度</param>
        /// <param name="mode">生成缩略图的方式</param>    
        public static string sc(string originalImagePath)
        {
            string fig = "";

            Image originalImage = Image.FromFile(originalImagePath);

            string thumbnailPath = context.Server.MapPath("~/file/");
            DateTime now = DateTime.Now; //获取系统时间
            string hb = now.Year + "" + now.Month + "" + now.Day + "" + now.Hour + "" + now.Minute + "" + now.Second + "" + now.Millisecond + ".jpg";
            thumbnailPath += hb;
            fig = "/file/" + hb;

            int towidth = 300;
            int toheight = 300;

            int x = 0;
            int y = 0;
            int ow = originalImage.Width;
            int oh = originalImage.Height;

            switch ("W")
            {
                case "HW"://指定高宽缩放（可能变形）                
                    break;
                case "W"://指定宽，高按比例                    
                    toheight = originalImage.Height * towidth / originalImage.Width;
                    break;
                case "H"://指定高，宽按比例
                    towidth = originalImage.Width * toheight / originalImage.Height;
                    break;
                case "Cut"://指定高宽裁减（不变形）                
                    if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
                    {
                        oh = originalImage.Height;
                        ow = originalImage.Height * towidth / toheight;
                        y = 0;
                        x = (originalImage.Width - ow) / 2;
                    }
                    else
                    {
                        ow = originalImage.Width;
                        oh = originalImage.Width * toheight / towidth;