首先，对不起我的英语语言不好，我是初学者程序员。在我的项目中，我使用线程类，但是完成后我看到了这个异常：
跨线程操作无效：控件“lblp4”从创建它的线程以外的线程访问。
在我的项目中，我Synchronize从Philosopher类中调用 5 个函数Form1：
Philosopher班级：
namespace AZsys
{
class Philosopher
{
public Int32 i;
public bool e, th;
public Philosopher()
{
}
public void main()
{
lock (AZsys.Program.frm.locker)
{
while (true)
{
if (i < 0 || i > 4)
{
System.Windows.Forms.MessageBox.Show("error");
break;
}
else
{
think();
AZsys.Program.frm.chopstick[i].WaitOne();
AZsys.Program.frm.chopstick[(i + 1) % 5].WaitOne();
eat();
AZsys.Program.frm.chopstick[(i + 1) % 5].Release();
AZsys.Program.frm.chopstick[i].Release();
}
}
}
Thread.Sleep(100);
}
private void eat()
{
switch (i)
{
case 1:
AZsys.Program.frm.lblp1.Text = "Eating...";
break;
case 2:
AZsys.Program.frm.lblp2.Text = "Eating...";
break;
case 3:
AZsys.Program.frm.lblp3.Text = "Eating...";
break;
case 4:
AZsys.Program.frm.lblp4.Text = "Eating...";
break;
case 5:
AZsys.Program.frm.lblp5.Text = "Eating...";
break;
}
e = true;
for (int j = 0; j < 992; j++)
{
if (j % 8 == 0)
e = true;
}
e = false;
}
private void think()
{
switch (i)
{
case 1:
AZsys.Program.frm.lblp1.Text = "Thinking..."+Thread.CurrentThread.Name.ToString();
break;
case 2:
AZsys.Program.frm.lblp2.Text = "Thinking..."+Thread.CurrentThread.Name.ToString();
break;
case 3:
AZsys.Program.frm.lblp3.Text = "Thinking..."+Thread.CurrentThread.Name.ToString();
break;
case 4:
AZsys.Program.frm.lblp4.Text = "Thinking..."+Thread.CurrentThread.Name.ToString();
break;
case 5:
AZsys.Program.frm.lblp5.Text = "Thinking..." + Thread.CurrentThread.Name.ToString();
break;
}
th = true;
for (int j = 0; j < 9924; j++)
{
if (j % 8 == 0)
th = true;
}
th = false;
}
}
即使在这段代码中，我也使用了 lock ( locker) 但不起作用！！！
Form1班级：
public partial class Form1 : Form
{
public Semaphore[] chopstick;
public object locker;
private Philosopher ph1;
private Philosopher ph2;
private Philosopher ph3;
private Philosopher ph4;
private Philosopher ph5;
public Form1()
{
InitializeComponent();
chopstick = new Semaphore[5];
}
private void Form1_Load(object sender, EventArgs e)
{
locker = new object();
ph1 = new Philosopher();
ph1.i = 1;
ph2 = new Philosopher();
ph2.i = 2;
ph3 = new Philosopher();
ph3.i = 3;
ph4 = new Philosopher();
ph4.i = 4;
ph5 = new Philosopher();
ph5.i = 5;
}
private void lblp2_Click(object sender, EventArgs e)
{
}
private void btnstart_Click(object sender, EventArgs e)
{
Thread.CurrentThread.Priority = ThreadPriority.Lowest;
Thread t1 = new Thread(ph1.main);
Thread t2 = new Thread(ph2.main);
Thread t3 = new Thread(ph3.main);
Thread t4 = new Thread(ph4.main);
Thread t5 = new Thread(ph5.main);
t1.Name = "t1";
t2.Name = "t2";
t3.Name = "t3";
t4.Name = "t4";
t5.Name = "t5";
t1.Priority = ThreadPriority.Highest;
t2.Priority = ThreadPriority.Highest;
t3.Priority = ThreadPriority.Highest;
t4.Priority = ThreadPriority.Highest;
t5.Priority = ThreadPriority.Highest;
// Thread.Sleep(100);
t4.Start();
Thread.Sleep(100);
t1.Start();
Thread.Sleep(100);
t2.Start();
Thread.Sleep(100);
t3.Start();
Thread.Sleep(100);
t5.Start();
Thread.Sleep(100);
}
}
}