【转】C#线程同步示例

using System;

using System.Threading;

//　银行帐户类

class Account

{

int balance;                         //　余额

Random r = new Random();

public Account(int initial)

{

balance = initial;

}

// 取钱

int Withdraw(int amount)

{

if (balance < 0)

{

throw new Exception("余额为负！");

}

lock (this)

{

if (balance >= amount)

{

Console.WriteLine("原有余额:  " + balance);

Console.WriteLine("支取金额: -" + amount);

balance = balance - amount;

Console.WriteLine("现有余额:  " + balance);

return amount;

}

else

{

return 0;           // 拒绝交易

}

}

}

// 测试交易

public void DoTransactions()

{

// 支取随机的金额100次

for (int i = 0; i < 100; i++)

{

Withdraw(r.Next(1, 100));

}

}

}

class TestApp

{

public static void Main()

{

//　建立10个线程同时进行交易

Thread[] threads = new Thread[10];

Account acc = new Account (1000);//余额

for (int i = 0; i < 10; i++)

{

Thread t = new Thread(new ThreadStart(acc.DoTransactions));

threads[i] = t;

}

for (int i = 0; i < 10; i++)

{

threads[i].Start();

}

}

}