.NET异步方法调用的例子

这样写的好处是TestMethod在同步和异步线程下，都能顺利地被调用．

MethodInvoker和Action都是.NET 2.0内置的Delegate类型，让你方法地回调一个没有参数的方法，而不用自己去定义新的Delegate．

private void button1_Click(object sender, EventArgs e)
{
    Thread t = new Thread(new ThreadStart(TestMethod));
    t.Start();
}

public void TestMethod()
{
    if (this.InvokeRequired)
    {
        //MethodInvoker handler = new MethodInvoker(TestMethod);
        Action handler = new Action(TestMethod);
        
        this.Invoke(handler, null);
    }
    else
    {
        this.Text = "Async Invoked.";
        MessageBox.Show("Async Invoked");
    }
}

.NET 3.0中有一个Action<T>，支持四个Generic的参数．

System.Action<int, int, int, int> handler2 = new Action<int, int, int, int>(Calc);
                this.Invoke(handler2, 1, 2, 3, 4);

public void Calc(int a, int b, int c, int d)
        {
            var r = a + b + c + d;
        }