all I have searched this question, and I found so many answers to it was not difficult to find a solution for my question. BUT, I have strange experience and I don't know the reason that's why I ask people to give me some advice. Here are my codes:
void SetThread()
{
for (int i = 0; i < _intArrayLength; i++)
{
Console.Write(string.Format("SetThread->i: {0}\r\n", i));
_th[i] = new Thread(new ThreadStart(() => RunThread(i)));
_th[i].Start();
}
}
void RunThread(int num)
{
Console.Write(string.Format("RunThread->num: {0}\r\n", num));
}
Yes, they are ordinary thread codes. I expect all the thread array should be calling RunThread method 10 times. It should be like
SetThread->i: 0
SetThread->i: 1
SetThread->i: 2
SetThread->i: 3
SetThread->i: 4
SetThread->i: 5
SetThread->i: 6
SetThread->i: 7
SetThread->i: 8
SetThread->i: 9
RunThread->num: 0
RunThread->num: 1
RunThread->num: 2
RunThread->num: 3
RunThread->num: 4
RunThread->num: 5
RunThread->num: 6
RunThread->num: 7
RunThread->num: 8
RunThread->num: 9
This is what I expect to be. The order is not important. But I get the result like below.
SetThread->i: 0
SetThread->i: 1
SetThread->i: 2
The thread '<No Name>' (0x18e4) has exited with code 0 (0x0).
The thread '<No Name>' (0x11ac) has exited with code 0 (0x0).
The thread '<No Name>' (0x1190) has exited with code 0 (0x0).
The thread '<No Name>' (0x1708) has exited with code 0 (0x0).
The thread '<No Name>' (0xc94) has exited with code 0 (0x0).
The thread '<No Name>' (0xdac) has exited with code 0 (0x0).
The thread '<No Name>' (0x12d8) has exited with code 0 (0x0).
The thread '<No Name>' (0x1574) has exited with code 0 (0x0).
The thread '<No Name>' (0x1138) has exited with code 0 (0x0).
The thread '<No Name>' (0xef0) has exited with code 0 (0x0).
SetThread->i: 3
RunThread->num: 3
RunThread->num: 3
RunThread->num: 3
SetThread->i: 4
RunThread->num: 4
SetThread->i: 5
SetThread->i: 6
RunThread->num: 6
RunThread->num: 6
SetThread->i: 7
RunThread->num: 7
SetThread->i: 8
RunThread->num: 8
SetThread->i: 9
RunThread->num: 9
RunThread->num: 10
What I expect is that RunThread function should carry the argument(num) from 0 to 9. And I cannot figure out what that error message is. "The thread '' ~~ and so on. Could anyone give me some clue on this?
You are creating a closure over the loop variable - an easy fix is to just create a local copy, so your thread uses the desired value:
void SetThread()
{
for (int i = 0; i < _intArrayLength; i++)
{
int currentValue = i;
Console.Write(string.Format("SetThread->i: {0}\r\n", i));
_th[i] = new Thread(() => RunThread(currentValue));
_th[i].Start();
}
}
You may want to change your code like this to use ParameterizedThreadStart delegate:
for (int i = 0; i < _intArrayLength; i++)
{
Console.Write(string.Format("SetThread->i: {0}\r\n", i));
_th[i] = new Thread((a) => RunThread((int)a));
_th[i].Start(i);
}
Otherwise, from your thread entry point delegate () => RunThread(i)
you're accessing the variable i
from the parent main thread's context, which may change before your new thread may even start.
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