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using System;using System.Collections.Generic;using System.IO;using System.Linq;using System.Text;using System.Text.RegularExpressions;using System.Threading.Tasks;using System.Drawing;using System.Drawing.Imaging;namespace ConsoleApplication10{    class Program    {        static void Main(string[] args)        {            string str = @"假设这里是一段base64编码的字符串";            Regex rgx = new Regex(@" ");            str = rgx.Replace(str, @"+");            byte[] data = new byte[str.Length];            data = Convert.FromBase64String(str);            MemoryStream ms = new MemoryStream(data);            Image img = Image.FromStream(ms);            //image.Save(@"C:\Users\Administrator\Desktop\a1a1.png", ImageFormat.Png);            Bitmap image = new Bitmap(img);            Bitmap image1 = new Bitmap(120, 120);            int width = image.Width;            int height = image.Height;            Graphics g = Graphics.FromImage(image1);            Rectangle rect = new Rectangle(50, 25, 120, 120);            g.DrawImage(image, 0, 0, rect, GraphicsUnit.Pixel);            //string url = Server.MapPath(@"~/saveimg/as.png");            image1.Save(@"C:\Users\Administrator\Desktop\a2.png", ImageFormat.Png);        }    }}

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