C#中图片与BASE64码互相转换

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//图片 转为    base64编码的文本        private void button1_Click(object sender, EventArgs e)        {            OpenFileDialog dlg = new OpenFileDialog();            dlg.Multiselect = true;            dlg.Title = "选择要转换的图片";            dlg.Filter = "Image files (*.jpg;*.bmp;*.gif;*.png)|*.jpg*.jpeg;*.gif;*.bmp|AllFiles (*.*)|*.*";            if (DialogResult.OK == dlg.ShowDialog())            {                for (int i = 0; i < dlg.FileNames.Length; i++)                {                    ImgToBase64String(dlg.FileNames[i].ToString());                }            }        }        //图片 转为    base64编码的文本        private void ImgToBase64String(string Imagefilename)        {            try            {                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 = 0;                ms.Read(arr, 0, (int)ms.Length);                ms.Close();                String strbaser64 = Convert.ToBase64String(arr);                sw.Write(strbaser64);                sw.Close();                fs.Close();               // MessageBox.Show("转换成功!");            }            catch (Exception ex)            {                MessageBox.Show("ImgToBase64String 转换失败\nException:" + ex.Message);            }        }        //base64编码的文本 转为    图片        private void button2_Click(object sender, EventArgs e)        {            OpenFileDialog dlg = new OpenFileDialog();            dlg.Multiselect = true;            dlg.Title = "选择要转换的base64编码的文本";            dlg.Filter = "txt files|*.txt";            if (DialogResult.OK == dlg.ShowDialog())            {                for (int i = 0; i < dlg.FileNames.Length; i++)                {                    Base64StringToImage(dlg.FileNames[i].ToString());                }                            }        }        //base64编码的文本 转为    图片        private void Base64StringToImage(string txtFileName)        {            try            {                FileStream ifs = new FileStream(txtFileName, FileMode.Open, FileAccess.Read);                StreamReader sr = new StreamReader(ifs);                String inputStr = sr.ReadToEnd();                byte[] arr = Convert.FromBase64String(inputStr);                MemoryStream ms = new MemoryStream(arr);                Bitmap bmp = new Bitmap(ms);                //bmp.Save(txtFileName + ".jpg", System.Drawing.Imaging.ImageFormat.Jpeg);                //bmp.Save(txtFileName + ".bmp", ImageFormat.Bmp);                //bmp.Save(txtFileName + ".gif", ImageFormat.Gif);                //bmp.Save(txtFileName + ".png", ImageFormat.Png);                ms.Close();                sr.Close();                ifs.Close();                this.pictureBox2.Image = bmp;                if (File.Exists(txtFileName))                {                    File.Delete(txtFileName);                }                //MessageBox.Show("转换成功！");            }            catch (Exception ex)            {                MessageBox.Show("Base64StringToImage 转换失败\nException：" + ex.Message);            }        }
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