ClassLibraryWeiBao/ClassImage.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;

namespace ClassLibraryWeiBao
{
    public class ThumbnailImage
    {
        ///<summary>
        /// 生成缩略图
        /// </summary>
        /// <param name="originalImagePath">源图路径（物理路径，含文件名）</param>
        /// <param name="thumbnailPath">缩略图路径（物理路径，含文件名）</param>
        /// <param name="width">缩略图宽度</param>
        /// <param name="height">缩略图高度</param>
        /// <param name="height">返回缩略图路径</param>
        public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height)
        {
            System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath);


            width = 80;

            height = (80 * originalImage.Height) / originalImage.Width;



            if (originalImage.Width <= 80)
            {

                width = originalImage.Width;

                height = originalImage.Height;





            }






            int towidth = width;
            int toheight = height;

            int x = 0; //缩略图在画布上的X放向起始点
            int y = 0; //缩略图在画布上的Y放向起始点
            int ow = originalImage.Width;
            int oh = originalImage.Height;
            int dw = originalImage.Width;
            int dh = originalImage.Height;

            if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
            {
                //宽比高大，以宽为准