C# 通过二进制，将多个文件合并为一个。

C# 通过二进制，将多个文件合并为一个。

        /// <summary>

        /// 合并文件

        /// </summary>

        /// <param name="strDirectory"></param>

        /// <param name="strMergeResultFile"></param>

        private void MergeFiles(string strInputDirectory, string strMergeResultFile)

        {

            string[] arrFileNames = Directory.GetFiles(strInputDirectory);

            int iSumFile = arrFileNames.Length;

            //progressBar1.Maximum = iSumFile;

            FileStream AddStream = new FileStream(strMergeResultFile + "_temp", FileMode.OpenOrCreate);

            BinaryWriter AddWriter = new BinaryWriter(AddStream);

            long firstFileLength = 0;

            FileStream TempStream = null;

            BinaryReader TempReader = null;

            //文件长度列表

            string allFileLength = "";

            //文件长度和文件内容叠加

            {

                for (int i = 0; i < iSumFile; i++)

                {

                    TempStream = new FileStream(arrFileNames[i], FileMode.Open);

                    TempReader = new BinaryReader(TempStream);

                    AddWriter.Write(TempReader.ReadBytes((int)TempStream.Length));

                    if (firstFileLength == 0)

                    {

                        firstFileLength = TempReader.BaseStream.Length;

                        allFileLength = firstFileLength.ToString().PadLeft(20, '0');

                    }

                    //暂时只处理2个文件的情况，下面是多文件

                    //allFileLength += "," + TempReader.BaseStream.Length.ToString().PadLeft(20, '0');

                    TempReader.Close();

                    TempStream.Close();

                }

                allFileLength = allFileLength.Trim(',');

                //释放资源

                AddWriter.Flush();

                AddWriter.Close();

                AddStream.Close();

                TempStream = null;

                TempReader = null;

            }

            //创建含有头信息的文件- 也达到了加密的效果

            {

                System.Text.UTF8Encoding UTF8 = new System.Text.UTF8Encoding();

                byte[] BytesMessage = UTF8.GetBytes(allFileLength);

                AddStream = new FileStream(strMergeResultFile + "_r", FileMode.OpenOrCreate);

                AddWriter = new BinaryWriter(AddStream);

                //文件头

                AddWriter.Write(BytesMessage);

                //写入原来文件

                TempStream = new FileStream(strMergeResultFile, FileMode.Open);

                TempReader = new BinaryReader(TempStream);

                AddWriter.Write(TempReader.ReadBytes((int)TempStream.Length));

                long cc = TempReader.BaseStream.Length;

                TempReader.Close();

                AddWriter.Flush();

                AddWriter.Close();

                TempStream.Close();

                //释放

                TempReader = null;

                AddWriter = null;

                TempStream = null;

            }

            //删掉临时

            File.Delete(strMergeResultFile + "_temp");

        }