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");

}