string str = "测试test";

//convert string to byte

byte[] Strbyte =System.Text.Encoding.Default.GetBytes(str);

//convert byte to string

string tempStr = System.Text.Encoding.Default.GetString(Strbyte);

//convert image to byte

FileStream fs = new FileStream(@"R:\Engineer Training\Intern Training\Chao\pic\1.png",FileMode.Open);

byte[] imageByte = new byte[fs.Length];

fs.Read(imageByte, 0, imageByte.Length);

fs.Close();

#region image to byte (2)

byte[] photo_byte = null;

using (FileStream fs2 = new FileStream(@"R:\Engineer Training\Intern Training\Chao\pic\1.png", FileMode.Open, FileAccess.Read))

{

using (BinaryReader br = new BinaryReader(fs2))

{

photo_byte = br.ReadBytes((int)fs2.Length);

}

}

#endregion

//byte to image

MemoryStream ms = new MemoryStream(imageByte);

Image photo = Image.FromStream(ms, true);

#region byte to image (2)

Image photo2 = null;

using (MemoryStream ms2 = new MemoryStream(imageByte))

{

ms2.Write(imageByte, 0, imageByte.Length);

photo2 = Image.FromStream(ms2, true);

}

#endregion

photo.Save(@"R:\Engineer Training\Intern Training\Chao\pic\3.jpg");