Question

这是我的代码的一部分。

DriveInfo[] allDrives = DriveInfo.GetDrives();
foreach (DriveInfo d in allDrives)
{
    MessageBox.Show("Waiting for drive");
    f1.scan(d.Name);
}

我尝试做的是扫描每个驱动器。扫描功能在另一种窗体内。当我在消息框上按“确定”时，扫描将在C盘上启动。但是，扫描进行时，消息框会再次显示。如果我再次按OK，D驱动器也会与C一起扫描。如果我删除MessageBox.Show（），则没有任何反应。我猜这两个线程正在运行。问题是我希望按顺序扫描所有驱动器。我试过Thread.Sleep（Timer.Infinite）来阻止这个线程。但那时程序就停止了。帮助我....

public void scan(string path)
{
    scanPath = path;
    //scanPath = scanPathTextBox.Text;
    FileAttributes attribs = File.GetAttributes(scanPath);

    if ((attribs & FileAttributes.Directory) == FileAttributes.Directory)
    {
        // Perform directory scan.
        Thread scanThread = new Thread(() =>
        {
            var scannedFiles = new List<Tuple<string, ScanResult, string>>();

            this.Invoke(new Action(() =>
            {
                scanProgressBar.Style = ProgressBarStyle.Marquee;
                // scanProgressBar.Value = i;
                statusLabel.Text = "Scanning...";
                logTextBox.Text = scanPath;
            }));

            _clamAV.ScanDirectory(scanPath,
                (file, result, virus) =>
                {
                    scannedFiles.Add(Tuple.Create(file, result, virus));

                    this.Invoke(new Action(() =>
                    {
                        logTextBox.Text = file;
                    }));
                });

            // Analyse results.
            var infectedFiles = scannedFiles.Where(f => f.Item2 == ScanResult.Virus);

            this.Invoke(new Action(() =>
            {
                logTextBox.Text = scanPath;
                threatInfoBox.AppendText(string.Format("{0} file(s) scanned, {1} infected\r\n",
                    scannedFiles.Count, infectedFiles.Count()));
                logTextBox.AppendText("\r\n");

                foreach (var file in infectedFiles)
                {
                    threatInfoBox.AppendText(string.Format("{0} infected with {1}\r\n", file.Item1, file.Item3));
                }

                scanProgressBar.Style = ProgressBarStyle.Continuous;
                scanProgressBar.Value = 100;
                statusLabel.Text = "Scan complete.";
                logTextBox.Text = " ";
                Form2 f2 = new Form2(this);
                this.Hide();
                f2.ShowDialog();
            }));
        });

        scanThread.Start();
    }
    else
    {
        // Perform file scan.
        Thread scanThread = new Thread(() =>
        {
            // Signal start of scan on UI thread.
            this.Invoke(new Action(() =>
            {
                scanProgressBar.Style = ProgressBarStyle.Marquee;

                statusLabel.Text = "Scanning...";
                //scanProgressBar.Value = i;
            }));

            string virusName = "";

            ScanResult scanResult = _clamAV.ScanFile(scanPath, ScanOptions.StandardOptions, out virusName);

            // Report scan completion.
            this.Invoke(new Action(() =>
            {
                statusLabel.Text = "Scan complete.";
                logTextBox.Text = " ";
                scanProgressBar.Value = 100;

                logTextBox.Text = scanPath;
                if (scanResult == ScanResult.Clean)
                    threatInfoBox.AppendText("File is clean.\r\n");
                else
                    threatInfoBox.AppendText("File is infected with " + virusName + ".\r\n");
                logTextBox.AppendText("\r\n");
            }));
        });

        // Begin scanning.
        scanThread.Start();
    }
}

Answer 1

您可以尝试锁定扫描功能。显然它不是线程安全的。尝试类似：

class TestScan {

 private static Object oMutex = new Object();

 public void scan(){
   lock(oMutex){
     /* do work */
   }
 } // end of scan method.

 /***/

 }

如果有另一个线程已经执行，那么落入此方法的每个线程都将等待锁定调用。它基本上只是一个简单的互斥锁。你可以阅读它here。

如何在其他工作时暂停一个线程？

1 个答案: