private void button1_Click(object sender, EventArgs e)
{
//调用委托实例的BeginInvoke方法来异步执行委托实例上绑定的方法
asyncChangeText changeText = new asyncChangeText(ChangeTextNoArgs);
//changeText.BeginInvoke(null, null);
//异步委托的回调
MyEventArgs ret = new MyEventArgs();
Console.WriteLine("1 " + getMemory(ret));
IAsyncResult rst = changeText.BeginInvoke(AssistClass.count.ToString(), ref ret, new AsyncCallback(CallbackMethod), "This is msgBox callBack!");
}
// The callback method must have the same signature as the
// AsyncCallback delegate.
static void CallbackMethod(IAsyncResult ar)
{
// Retrieve the delegate.
AsyncResult result = (AsyncResult)ar;
asyncChangeText caller = (asyncChangeText)result.AsyncDelegate;
// Retrieve the format string that was passed as state
// information.
string rst = (string)ar.AsyncState;
// Define a variable to receive the value of the out parameter.
// If the parameter were ref rather than out then it would have to
// be a class-level field so it could also be passed to BeginInvoke.
MyEventArgs outStr = new MyEventArgs();
Console.WriteLine("2 " + getMemory(outStr));
// Call EndInvoke to retrieve the results.
bool returnValue = caller.EndInvoke(ref outStr, result);
MessageBox.Show(rst + "\r\n" + outStr + "\r\n" + returnValue.ToString());
Console.WriteLine("3 " + getMemory(outStr));
}
