本文实例讲述了C#中图片、二进制与字符串的相互转换方法。分享给大家供大家参考，具体如下：

protected void Button1_Click(object sender, EventArgs e) { //图片转二进制 byte[] imageByte = GetPictureData(Server.MapPath("./uploadfile/111.png")); //二进制转换成字符串 string picStr = Convert.ToBase64String(imageByte); //输出字符串 Response.Write(picStr); //字符串转二进制 byte[] imageBytes = Convert.FromBase64String(picStr); //读入MemoryStream对象 MemoryStream memoryStream = new MemoryStream(imageBytes, 0, imageBytes.Length); memoryStream.Write(imageBytes, 0, imageBytes.Length); //二进制转成图片保存 System.Drawing.Image image = System.Drawing.Image.FromStream(memoryStream); image.Save(Server.MapPath("./uploadfile/222.png")); } /// <summary> /// 二进制流转图片 /// </summary> /// <param name="streamByte">二进制流</param> /// <returns>图片</returns> public System.Drawing.Image ReturnPhoto(byte[] streamByte) { System.IO.MemoryStream ms = new System.IO.MemoryStream(streamByte); System.Drawing.Image img = System.Drawing.Image.FromStream(ms); return img; } /// <summary> /// 图片转二进制 /// </summary> /// <param name="imagepath">图片地址</param> /// <returns>二进制</returns> public byte[] GetPictureData(string imagepath) { //根据图片文件的路径使用文件流打开，并保存为byte[] FileStream fs = new FileStream(imagepath, FileMode.Open);//可以是其他重载方法 byte[] byData = new byte[fs.Length]; fs.Read(byData, 0, byData.Length); fs.Close(); return byData; } /// <summary> /// 图片转二进制 /// </summary> /// <param name="imgPhoto">图片对象</param> /// <returns>二进制</returns> public byte[] PhotoImageInsert(System.Drawing.Image imgPhoto) { //将Image转换成流数据，并保存为byte[] MemoryStream mstream = new MemoryStream(); imgPhoto.Save(mstream, System.Drawing.Imaging.ImageFormat.Bmp); byte[] byData = new Byte[mstream.Length]; mstream.Position = 0; mstream.Read(byData, 0, byData.Length); mstream.Close(); return byData; }

PS：这里小编再给大家推荐本站的一款图片转BASE64格式的在线转换工具，非常具有实用价值：

在线图片转换BASE64工具：

http://tools.jb51.net/transcoding/img2base64

希望本文所述对大家C#程序设计有所帮助。