using System;

 using System.Collections.Generic;

 using System.Drawing;

 using System.IO;

 using System.Linq;

 using System.Web;

 using System.Drawing.Imaging;

 // 博客园  aC#Coder 整理

 namespace Html5Image.Tools

 {

     public class ImageTool

     {

         //图片 转为    base64编码的文本

         public static string ImgToBase64String(Bitmap bmp)

         {

             //Bitmap bmp = new Bitmap(Imagefilename);

             //this.pictureBox1.Image = bmp;

             //FileStream fs = new FileStream(Imagefilename + ".txt", FileMode.Create);

             //StreamWriter sw = new StreamWriter(fs);

             MemoryStream ms = new MemoryStream();

             bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);

             byte[] arr = new byte[ms.Length];

             ms.Position = ;

             ms.Read(arr, , (int)ms.Length);

             ms.Close();

             String strbaser64 = Convert.ToBase64String(arr);

             return strbaser64;

         }

         public static Bitmap Base64StringToImage(string base64Img)

         {

             byte[] bytes = Convert.FromBase64String(base64Img);

             MemoryStream ms = new MemoryStream();

             ms.Write(bytes, , bytes.Length);

             Bitmap bmp = new Bitmap(ms);

             return bmp;

         }

         /// <summary>

         /// 保存图片

         /// </summary>

         /// <param name="base64Img"></param>

         /// <param name="imgPath"></param>

         /// <param name="imgFormat">EX: System.Drawing.Imaging.Jpeg </param>

         public static void SaveFile(string base64Img, string imgPath, ImageFormat imgFormat )

         {

             string dir = Path.GetDirectoryName(imgPath);

             if (!Directory.Exists(dir))

             {

                 Directory.CreateDirectory(dir);

             }

             var bitmap = Base64StringToImage(base64Img);

             bitmap.Save(imgPath, imgFormat);

         }

     }

 }