C#中图片与BASE64码互相转换

　　　　　　

　　　　//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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