synchronous thread ?

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I need to use thread to press more than one key at same time (inner loop) and after one second press repeat this task.

I use this code but I found some problem if I use join the first thread not press at same time but if not use press at same time but all thread start.

C#

private void play()
        {
            
            for (int i = 0; i < 2; i++)
            {
                Thread th=null;
                for (int j = 0; j < 2;j++ )
                {
                    
                   SubNote sub= ArrayPlayNote[i].NotesSameTime[j];
             
                   ThreadStart starter = delegate { MessageSub(sub); };
                  th = new Thread(starter);
                
                   th.Start();
                    
                }
                th.Join();
             
            }

        }
///////////////////////////////////////////////////////
Keyboard ky = new Keyboard();
        private void MessageSub( SubNote sub)
        {
            ky.pianoControl1.PressPianoKey(sub.KeyNum);
            Thread.Sleep(1000);
            ky.pianoControl1.ReleasePianoKey(sub.KeyNum);
          
        }

Thanks for help me.

Posted 24-Nov-11 23:49pm

shadiabusamra

Updated 24-Nov-11 23:54pm

RaisKazi

v2

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RaisKazi 25-Nov-11 5:55am

Edited: 1) Formatting 2) Added "pre" tag.

Paulo Zemek 25-Nov-11 7:36am

I didn't understand what you are really asking.
But you are starting two threads and you are only joining to the last one. And why use a thread to join it? Call the method directly... I really can't help because I can't understand what you are really trying to do.

shadiabusamra 25-Nov-11 8:19am

i use join to prevent start next threads (outer loop) before previous threads finish

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valza · Answer 1 · 2011-11-25T00:46:00

this is the basic

C#

static void Main(string[] args)
       {
           for (int i = 0; i < 100; i++)
           {
               Thread t = new Thread(new ParameterizedThreadStart(MyMethod));
               t.Start(i); //pass in object
           }
           Console.ReadLine();
       }

       public static void MyMethod(object input)
       {
           //Cast object
           Console.WriteLine("Hello from MyMethod " + input.ToString());
       }

So you can pass in an object to thread. if you need to print in console from 1 to 99, not like now, you need to use ReaderWriterLock.
Ok.
If I am wrong tell me please someone because i am learning .NET.

Sergey Alexandrovich Kryukov · Answer 2 · 2011-11-25T00:00:00

Solution 1

This is because the general idea is such a big misuse of threads. Everything looks wrong and beyond repair. Maybe if you explain the requirement, someone or myself would advise you a simple solution. The problem does not look very difficult.

[EDIT]
About passing parameters through thread: see my solutions:
How to pass ref parameter to the thread[^],
change paramters of thread (producer) after it started[^].

—SA

Posted 25-Nov-11 0:00am

Sergey Alexandrovich Kryukov

Updated 25-Nov-11 5:09am

v2

Comments

shadiabusamra 25-Nov-11 6:06am

In 2D array i need to start thread for all element first row in same time after (1 second) start thread for all element in second row

valza 25-Nov-11 6:13am

Does this thread something return? There are 4 ways to use threads. Give more info about your issue.

shadiabusamra 25-Nov-11 6:24am

no return in thread but pass parameter through thread

Sergey Alexandrovich Kryukov 25-Nov-11 11:08am

You see, you say "I want to do this and that with threads". This is not your ultimate goal. Start with explaining what your application should do. Wait a minite...
--SA

Sergey Alexandrovich Kryukov 25-Nov-11 11:09am

For now, please see my update, after [EDIT].
--SA