读写文件

<pre name="code" class="csharp">BackgroundWorker background1 = new BackgroundWorker();byte[] buffer1;//HDD -> MEM
BackgroundWorker background2 = new BackgroundWorker();byte[] buffer2;//MEM -> HDD
UInt32 pointer1, pointer2;
bool abort = false; 
int bytesreaded = 0; 
public virtual void background1_DoWork(object sender, DoWorkEventArgs e)
{//Read Data from HDD to MEM
    
    while ((bytesreaded = br.Read(buffer1, 0, blocksize)) > 0)
    {
        if (abort)
                return;

        while (pointer2 != pointer1)//Wait until MEM data is written
        {
            if (abort)
                return;
        }
        ms.Position = 0;
        ms.Write(buffer1, 0, bytesreaded);
        pointer1++;
    }
}

public virtual void background2_DoWork(object sender, DoWorkEventArgs e)
{//Write Data from MEM
    long byteswritten=0;
    while (bytesreaded>0)
    {
        while (!(pointer2 < pointer1))//wait until MEM data is read
        {
            if (abort)
                return;
        }
        ms.Position = 0;
        ms.Read(buffer2, 0, bytesreaded);
        bw.Write(buffer2, 0, bytesreaded);//Test Purpose Only
        byteswritten += bytesreaded;
        pointer2++;
    }
}

public virtual void background1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
    br.Close();
}

public virtual void background2_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
    fs.Close();
    ms.Close();
    bw.Close();

    string duration = DateTime.Now.Subtract(tStart).TotalSeconds.ToString();
    MessageBox.Show("Done! " + duration);
}


FileStream fs; System.IO.BinaryReader br;
MemoryStream ms;
BinaryWriter bw;
long length;

DateTime tStart;
public void TransferFromFile(string filename, string copyfile, UInt16 buffersize)
{
    tStart = DateTime.Now;
    blocksize = buffersize;
    if (background1.IsBusy || background2.IsBusy)
        return;

    try
    {
        fs = new FileStream(filename, FileMode.Open);
        length = fs.Length;
        br = new BinaryReader(fs, new UTF8Encoding());
        ms = new MemoryStream(buffersize);
        bw = new BinaryWriter(System.IO.File.Open(copyfile, FileMode.Create), new UTF8Encoding());

        buffer1 = new byte[blocksize];
        buffer2 = new byte[blocksize];
        
        background1.RunWorkerAsync();
        while (bytesreaded==0) { }
        background2.RunWorkerAsync();
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.ToString(), "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
    } 
}