我如何在c#中添加加密流写入操作的进度条

Question

作为项目的一部分，我一直在研究一个加密和解密文件的程序。该程序本身工作良好，但当我试图添加一个进度条，以显示加密/解密过程的进度出错。进度条运行得非常好，直到大约85-90%，然后它抛出一个错误，认为该值超过了最大限制。此外，进度条进行得太慢，即使我加密一个16KB的文件，也需要大约15-20秒才能达到错误情况，如果没有任何进度条，这几乎不需要时间。我尝试过使用后台工作人员来实现进度条。有没有人能告诉我如何让进度条在我的程序中工作?

下面是我的加密过程代码:

public void EncryptFile()
    {
        try
        {
            OpenFileDialog od = new OpenFileDialog();
            od.Title = "Select File To Encrypt";
            od.Filter = "All files (*.*)|*.*";
            string ifile = "";
            if (od.ShowDialog() == DialogResult.OK)
            {
                ifile = od.InitialDirectory + od.FileName;
            }
            else
            {
                MessageBox.Show("No file selected!!");
                goto b;
            }
            if (Path.GetExtension(ifile) == ".arv")
            {
                MessageBox.Show("Error!!File already Encrypted.");
                return;
            }
            string ofile = ifile + ".arv";
        a: string password = Prompt.ShowDialog();
            if (password == "")
            {
                MessageBox.Show("Password Field cannot be blank!!");
                goto a;
            }
            else if (password == null)
            {
                goto b;
            }
            int ph = password.GetHashCode();
            byte[] ia = BitConverter.GetBytes(ph);
            if (BitConverter.IsLittleEndian)
                Array.Reverse(ia);
            byte[] phb = ia;
            UnicodeEncoding UE = new UnicodeEncoding();
            byte[] salt = new byte[] { 10, 20, 30, 40, 50, 60, 70, 80 };
            Rfc2898DeriveBytes k = new Rfc2898DeriveBytes(password, salt);
            string cryptFile = ofile;
            FileStream fsCrypt = new FileStream(cryptFile, FileMode.Create);
            AesManaged AMCrypto = new AesManaged();
            AMCrypto.Key = k.GetBytes(32);
            AMCrypto.IV = k.GetBytes(16);
            CryptoStream cs = new CryptoStream(fsCrypt, AMCrypto.CreateEncryptor(), CryptoStreamMode.Write);
            cs.Write(phb, 0, 4);
            FileStream fsIn = new FileStream(ifile, FileMode.Open);
            int data;
            while ((data = fsIn.ReadByte()) != -1)
                cs.WriteByte((byte)data);
            fsIn.Close();
            cs.Close();
            fsCrypt.Close();
            File.Delete(ifile);
            MessageBox.Show("File Encrypted!!");
        b: ;
        }
        catch (Exception e)
        {
            MessageBox.Show(e.ToString());
        }

Prompt是我创建的一个单独的类，用于生成一个要求用户输入密码的动态表单。它看起来很像任何密码提示，有两个字段用于输入和验证密码，还有一个显示密码复选框。文件是输入文件，文件是输出文件。

Update:这是我用backgroundworker尝试的代码。进度条现在似乎可以工作了，但加密速度大大降低，而且加密过程在进度条填充之前完成，即。，在进度条填满之前，就会显示"加密完成"消息。此外，当我尝试为解密做同样的事情时，我得到一个异常，说加密流不支持查找。什么好主意吗?

public Form1()
    {
        InitializeComponent();
        Shown += new EventHandler(Form1_Shown);

        backgroundWorker1.WorkerReportsProgress = true;
        backgroundWorker1.DoWork += new DoWorkEventHandler(backgroundWorker1_DoWork);
        backgroundWorker1.ProgressChanged += new ProgressChangedEventHandler(backgroundWorker1_ProgressChanged);
    }
    void Form1_Shown(object sender, EventArgs e)
    {
        backgroundWorker1.RunWorkerAsync();
    }
    void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
    {
        try
        {
            string ifile = @"F:abc.mp4";
            int i = 0;
            if (Path.GetExtension(ifile) == ".arv")
            {
                MessageBox.Show("Error!!File already Encrypted.");
                return;
            }
            string ofile = ifile + ".arv";
        a: string password = Prompt.ShowDialog();
            if (password == "")
            {
                MessageBox.Show("Password Field cannot be blank!!");
                goto a;
            }
            else if (password == null)
            {
                goto b;
            }
            int ph = password.GetHashCode();
            byte[] ia = BitConverter.GetBytes(ph);
            if (BitConverter.IsLittleEndian)
                Array.Reverse(ia);
            byte[] phb = ia;
            UnicodeEncoding UE = new UnicodeEncoding();
            byte[] salt = new byte[] { 10, 20, 30, 40, 50, 60, 70, 80 };
            Rfc2898DeriveBytes k = new Rfc2898DeriveBytes(password, salt);
            string cryptFile = ofile;
            FileStream fsCrypt = new FileStream(cryptFile, FileMode.Create);
            AesManaged AMCrypto = new AesManaged();
            AMCrypto.Key = k.GetBytes(32);
            AMCrypto.IV = k.GetBytes(16);
            CryptoStream cs = new CryptoStream(fsCrypt, AMCrypto.CreateEncryptor(), CryptoStreamMode.Write);
            cs.Write(phb, 0, 4);
            FileStream fsIn = new FileStream(ifile, FileMode.Open);
            int data;
            double counter = 1;
            while ((data = fsIn.ReadByte()) != -1)
            {
                cs.WriteByte((byte)data);
                backgroundWorker1.ReportProgress((int)((counter / fsIn.Length) * 100));
                counter++;
            }
            fsIn.Close();
            cs.Close();
            fsCrypt.Close();
            File.Delete(ifile);
            MessageBox.Show("File Encrypted!!");
        b: ;
        }
        catch (Exception f)
        {
            MessageBox.Show(f.ToString());
        }

Answer 1

使用BackgroundWorker:

int data;
double counter = 1;
while ((data = fsIn.ReadByte()) != -1)
{
    cs.WriteByte((byte)data);
    worker.ReportProgress((int)((counter / fs.Length) * 100));
    counter++;
}

如果您不确定如何使用BackgroundWorker:

c#进度条- can't wrap my head around it