字节和文件互相转换

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//文件转换为字节
            FileStream Stream = new FileStream(fileName, FileMode.Open, FileAccess.Read);
            BinaryReader r = new BinaryReader(Stream);
            r.BaseStream.Seek(0, SeekOrigin.Begin);    //将文件指针设置到文件开
            byte[] byt = r.ReadBytes((int)r.BaseStream.Length);

            //字节转换为文件
            FileStream Stream = new FileStream(fileName, FileMode.OpenOrCreate);
            Stream.Write(byt, 0, byt.Length);

 /// <summary>
    /// Byte和File互转帮助类
    /// </summary>
    public class ByteHelper
    {
        /// <summary>
        /// 读文件到byte[]
        /// </summary>
        /// <param name="fileName">硬盘文件路径</param>
        /// <returns></returns>
        public static byte[] ReadFileToByte(string fileName)
        {
            FileStream pFileStream = null;
            byte[] pReadByte = new byte[0];
            try
            {
                pFileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read);
                BinaryReader r = new BinaryReader(pFileStream);
                r.BaseStream.Seek(0, SeekOrigin.Begin);    //将文件指针设置到文件开
                pReadByte = r.ReadBytes((int)r.BaseStream.Length);
                return pReadByte;
            }
            catch
            {
                return pReadByte;
            }
            finally
            {
                if (pFileStream != null)
                    pFileStream.Close();
            }
        }
 
        /// <summary>
        /// 写byte[]到fileName
        /// </summary>
        /// <param name="pReadByte">byte[]</param>
        /// <param name="fileName">保存至硬盘路径</param>
        /// <returns></returns>
        public static bool WriteByteToFile(byte[] pReadByte, string fileName)
        {
            FileStream pFileStream = null;
            try
            {
                pFileStream = new FileStream(fileName, FileMode.OpenOrCreate);
                pFileStream.Write(pReadByte, 0, pReadByte.Length);
            }
            catch
            {
                return false;
            }
            finally
            {
                if (pFileStream != null)
                    pFileStream.Close();
            }
            return true;
        }
    } 

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