这是我的代码。我想实现多线程。我的意思是说我要先执行一个线程。一段时间后，线程1是否已完成任务然后返回并执行线程2.一段时间后，移至再次执行一个线程。如何执行此操作。我尝试在此处加入方法，但没有用。
private void ThreadCreate()
{
try
{
Print thr1 = new Print("First Thread : Service Started ");
Print thr2 = new Print("Seconf Thread : Service Started");
Thread thread1 = new Thread(new ThreadStart(thr1.TextLog));
Thread thread2 = new Thread(new ThreadStart(thr2.TextLog));
thread1.Name = "Thread1";
thread2.Name = "Thread2";
thread1.Start();
thread2.Start();
thread1.Join(1000);
thread2.Join(1000);
}
catch (Exception ex)
{
}
}
///// Part2
class Print
{
public string apppath = System.AppDomain.CurrentDomain.BaseDirectory.ToString();
string _message;
public Print(string message)
{
this_message = message;
}
public void TextLog()
{
try
{
StreamWriter sw;
FileInfo f;
Thread thr = Thread.CurrentThread;
int j = 0;
string s = apppath + " Print " + DateTime.Today.ToString("dd-MM-yyyy") + ".txt";
f = new FileInfo(s);
if (f.Exists)
{
sw = f.AppendText();
}
else
{
sw = f.CreateText();
sw.WriteLine();
}
sw.WriteLine("-----------------------------------------------------------------");
sw.WriteLine(_msg + " " + DateTime.Now.ToString("yyyy.MM.dd HH:mm:ss:ffff"));
if (_msg == "Service Stopped ...............")
{
}
else
{
for (int i = 0; i < 10; i++)
{
Thread thr2 = Thread.CurrentThread;
if (thr2.Name == "Thread1")
{
sw.WriteLine(thr2.Name + " : " + i + " " + DateTime.Now.ToString("yyyy.MM.dd HH:mm:ss:ffff"));
}
else
{
sw.WriteLine(thr2.Name + " ::: " + i + " " + DateTime.Now.ToString("yyyy.MM.dd HH:mm:ss:ffff"));
}
j = j + 1;
sw.WriteLine("Thread will sleep now -----------------------------------------------------------------");
Thread.Sleep(1000);
sw.WriteLine("Thread came out from sleeping -----------------------------------------------------------------");
}
}
sw.Close();
}
catch (Exception e)
{
_message = e.Message;
}
}
}
我正在得到这样的输出。 输出：
----------------------------------------------------------------
First Thread : Service Started 2018.08.28 12:32:10:1123
Thread1 : 0 2018.08.28 12:32:10:1123
Thread will sleep now -----------------------------------------------------------------
Thread came out from sleeping -----------------------------------------------------------------
Thread1 : 1 2018.08.28 12:32:11:1279
Thread will sleep now -----------------------------------------------------------------
Thread came out from sleeping -----------------------------------------------------------------
Thread1 : 2 2018.08.28 12:32:12:1436
Thread will sleep now -----------------------------------------------------------------
Thread came out from sleeping -----------------------------------------------------------------
Thread1 : 3 2018.08.28 12:32:13:1593
Thread will sleep now -----------------------------------------------------------------
Thread came out from sleeping -----------------------------------------------------------------
Thread1 : 4 2018.08.28 12:32:14:1750
Thread will sleep now -----------------------------------------------------------------
Thread came out from sleeping -----------------------------------------------------------------
Thread1 : 5 2018.08.28 12:32:15:1907
Thread will sleep now -----------------------------------------------------------------
Thread came out from sleeping -----------------------------------------------------------------
Thread1 : 6 2018.08.28 12:32:16:2063
Thread will sleep now -----------------------------------------------------------------
Thread came out from sleeping -----------------------------------------------------------------
Thread1 : 7 2018.08.28 12:32:17:2220
Thread will sleep now -----------------------------------------------------------------
Thread came out from sleeping -----------------------------------------------------------------
Thread1 : 8 2018.08.28 12:32:18:2377
Thread will sleep now -----------------------------------------------------------------
Thread came out from sleeping -----------------------------------------------------------------
Thread1 : 9 2018.08.28 12:32:19:2534
Thread will sleep now -----------------------------------------------------------------
Thread came out from sleeping -----------------------------------------------------------------
-----------------------------------------------------------------
First Thread : Service Started 2018.08.28 12:33:00:1499
Thread1 : 0 2018.08.28 12:33:00:1499
Thread will sleep now -----------------------------------------------------------------
Thread came out from sleeping -----------------------------------------------------------------
Thread1 : 1 2018.08.28 12:33:01:1656
Thread will sleep now -----------------------------------------------------------------
Thread came out from sleeping -----------------------------------------------------------------
Thread1 : 2 2018.08.28 12:33:02:1813
Thread will sleep now -----------------------------------------------------------------
Thread came out from sleeping -----------------------------------------------------------------
Thread1 : 3 2018.08.28 12:33:03:1969
Thread will sleep now -----------------------------------------------------------------
Thread came out from sleeping --------------------------------------
首先执行一个线程，然后启动线程1。我不会这样输出。
预期输出：
-----------------------------------------------------------------
First Thread : Service Started 2018.08.28 12:32:10:1123
Thread1 : 0 2018.08.28 12:32:10:1123
Thread will sleep now -----------------------------------------------------------------
Thread came out from sleeping -----------------------------------------------------------------
Thread1 : 1 2018.08.28 12:32:11:1279
Thread will sleep now -----------------------------------------------------------------
Thread came out from sleeping -----------------------------------------------------------------
Thread1 : 2 2018.08.28 12:32:12:1436
Thread will sleep now -----------------------------------------------------------------
Thread came out from sleeping -----------------------------------------------------------------
Thread2 : 0 2018.08.28 12:32:13:1593
Thread will sleep now -----------------------------------------------------------------
Thread came out from sleeping -----------------------------------------------------------------
Thread2 : 1 2018.08.28 12:32:14:1750
Thread will sleep now -----------------------------------------------------------------
Thread came out from sleeping -----------------------------------------------------------------
Thread1 : 3 2018.08.28 12:32:15:1907
Thread will sleep now -----------------------------------------------------------------
Thread came out from sleeping -----------------------------------------------------------------
Thread1 : 4 2018.08.28 12:32:16:2063
Thread will sleep now -----------------------------------------------------------------
Thread came out from sleeping -----------------------------------------------------------------
Thread2 : 2 2018.08.28 12:32:17:2220
Thread will sleep now -----------------------------------------------------------------
Thread came out from sleeping -----------------------------------------------------------------
答案 0 :(得分：1)
从输出日志中可以看到，“服务启动”事件之间大约有50秒。我认为它们来自应用程序的两次不同运行。
另一件事是为什么您没有从Thread2获得任何输出。那是因为您的Thread1拥有对该日志文件的独占访问权限。 Thread2尝试访问该文件，并在使用文件时获取一个异常（IOException），但是由于无法记录此异常，因此该线程会悄悄地死掉。
如果要从多个线程将信息写入日志，则需要同步文件访问。我建议为此创建一个特殊的类。诸如此类（最简单的方法，仅用于演示目的）：
public static class Log1
{
private static string filePath;
private static object syncRoot = new object();
public static void WriteLine(string m)
{
lock (syncRoot)
{
if (string.IsNullOrEmpty(filePath))
{
filePath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "test20");
Directory.CreateDirectory(filePath);
filePath = Path.Combine(filePath, "Print_" + DateTime.Today.ToString("dd-MM-yyyy") + ".txt");
}
File.AppendAllText(filePath, m + Environment.NewLine);
}
}
}
然后您的线程方法变为：
public void TextLog()
{
try
{
Thread thr = Thread.CurrentThread;
int j = 0;
Log1.WriteLine("-----------------------------------------------------------------");
Log1.WriteLine(_message + " " + DateTime.Now.ToString("yyyy.MM.dd HH:mm:ss:ffff"));
if (_message == "Service Stopped ...............")
{
}
else
{
for (int i = 0; i < 10; i++)
{
Thread thr2 = Thread.CurrentThread;
if (thr2.Name == "Thread1")
{
Log1.WriteLine(thr2.Name + " : " + i + " " + DateTime.Now.ToString("yyyy.MM.dd HH:mm:ss:ffff"));
}
else
{
Log1.WriteLine(thr2.Name + " ::: " + i + " " + DateTime.Now.ToString("yyyy.MM.dd HH:mm:ss:ffff"));
}
j = j + 1;
Log1.WriteLine("Thread will sleep now -----------------------------------------------------------------");
Thread.Sleep(1000);
Log1.WriteLine("Thread came out from sleeping -----------------------------------------------------------------");
}
}
}
catch (Exception e)
{
_message = e.Message;
Log1.WriteLine(e.ToString());
}
}
有效产生以下内容的
-----------------------------------------------------------------
-----------------------------------------------------------------
Seconf Thread : Service Started 2018.08.28 10:27:19:8441
Thread2 ::: 0 2018.08.28 10:27:19:8491
Thread will sleep now
-----------------------------------------------------------------
First Thread : Service Started 2018.08.28 10:27:19:8402
Thread1 : 0 2018.08.28 10:27:19:8691
Thread will sleep now
-----------------------------------------------------------------
Thread came out from sleeping
-----------------------------------------------------------------
Thread2 ::: 1 2018.08.28 10:27:20:8665
Thread will sleep now
...