c# 中Bitmap， byte[] ，Stream 文件相互转换

//byte[] 转图片public static Bitmap BytesToBitmap(byte[] Bytes)        {            MemoryStream stream = null;            try            {                stream = new MemoryStream(Bytes);                return new Bitmap((Image)new Bitmap(stream));            }            catch (ArgumentNullException ex)            {                throw ex;            }            catch (ArgumentException ex)            {                throw ex;            }            finally            {                stream.Close();            }        } //图片转byte[]         public static byte[] BitmapToBytes(Bitmap Bitmap)        {            MemoryStream ms = null;            try            {                ms = new MemoryStream();                Bitmap.Save(ms, Bitmap.RawFormat);                byte[] byteImage = new Byte[ms.Length];                byteImage = ms.ToArray();                return byteImage;            }            catch (ArgumentNullException ex)            {                throw ex;            }            finally            {                ms.Close();            }        }    }=====================* Stream 和 byte[] 之间的转换 * - - - - - - - - - - - - - - - - - - - - - - - *//// <summary>/// 将 Stream 转成 byte[]/// </summary>public byte[] StreamToBytes(Stream stream){    byte[] bytes = new byte[stream.Length];    stream.Read(bytes, 0, bytes.Length);    // 设置当前流的位置为流的开始    stream.Seek(0, SeekOrigin.Begin);    return bytes;}/// <summary>/// 将 byte[] 转成 Stream/// </summary>public Stream BytesToStream(byte[] bytes){    Stream stream = new MemoryStream(bytes);    return stream;}/* - - - - - - - - - - - - - - - - - - - - - - - -  * Stream 和 文件之间的转换 * - - - - - - - - - - - - - - - - - - - - - - - *//// <summary>/// 将 Stream 写入文件/// </summary>public void StreamToFile(Stream stream,string fileName){    // 把 Stream 转换成 byte[]    byte[] bytes = new byte[stream.Length];    stream.Read(bytes, 0, bytes.Length);    // 设置当前流的位置为流的开始    stream.Seek(0, SeekOrigin.Begin);    // 把 byte[] 写入文件    FileStream fs = new FileStream(fileName, FileMode.Create);    BinaryWriter bw = new BinaryWriter(fs);    bw.Write(bytes);    bw.Close();    fs.Close();}/// <summary>/// 从文件读取 Stream/// </summary>public Stream FileToStream(string fileName){                // 打开文件    FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read);    // 读取文件的 byte[]    byte[] bytes = new byte[fileStream.Length];    fileStream.Read(bytes, 0, bytes.Length);    fileStream.Close();    // 把 byte[] 转换成 Stream    Stream stream = new MemoryStream(bytes);    return stream;}