static void DisplayResult(IAsyncResult result)
{
string format = (string)result.AsyncState;
AsyncResult delegateResult = (AsyncResult)result;
SampleDelegate delegateInstance = (SampleDelegate)delegateResult.AsyncDelegate;
Console.WriteLine(format, delegateInstance.EndInvoke(result));
}
//在回调函数中儿取
static void DisplayResult(IAsyncResult result)
{
string format = (string)result.AsyncState; // 就是BeginInvoke的第三个参数
AsyncResult delegateResult = (AsyncResult)result; //传入的result总是一个AsyncResult实例，可用于获取原来的委托实例，从而可以调用EndInvoke
SampleDelegate delegateInstance = (SampleDelegate)delegateResult.AsyncDelegate;
Console.WriteLine(format, delegateInstance.EndInvoke(result)); //异步委托要调用EndInvoke有两个目的：1）获取近回值 2)防止内存泄漏
}
private void Start()
{
SampleDelegate counter = CountCharacters;
SampleDelegate parser = Parse;
var counterResult = counter.BeginInvoke("hello", null, null);
var parserResult = parser.BeginInvoke("10", null, null);
print("Основной поток с ID = " + Thread.CurrentThread.ManagedThreadId + " продолжает выполняться");
print("Счетчик вернул " + counter.EndInvoke(counterResult));
print("Парсер вернул " + parser.EndInvoke(parserResult));
print("Основной поток с ID = " + Thread.CurrentThread.ManagedThreadId + " завершился");
}
static void Main(string[] args)
{
SampleDelegate counter = new SampleDelegate(CountCharacters);
SampleDelegate parser = new SampleDelegate(Parser);
IAsyncResult couterResult = counter.BeginInvoke("hello", null, null); //这里不会堵塞
IAsyncResult parserResult = parser.BeginInvoke("10", null, null); //这里不会堵塞
Console.WriteLine("Main thread continuing");
Console.WriteLine("Counter returned {0}", counter.EndInvoke(couterResult)); //会在这里堵塞
Console.WriteLine("Parser returned {0}", parser.EndInvoke(parserResult)); //会在这里堵塞
Console.WriteLine("Done");
Console.ReadKey();
}
static void Main(string[] args)
{
// class instance
Program p = new Program();
// -- delegates
//FirstDelegate del = new FirstDelegate(p.Hello);
//FirstDelegate del2 = new FirstDelegate(p.Hello);
//FirstDelegate del3 = new FirstDelegate(p.Hello);
//FirstDelegate del_comb = del + del2 + del3;
//Console.WriteLine(del_comb(23));
//Console.WriteLine(del(10));
//Console.WriteLine(del(12));
//Console.WriteLine(del(23));
//Console.WriteLine(del.Method.Name);
//Console.WriteLine(del.Target.ToString());
// -- events
//ClassWithEvents cwe = new ClassWithEvents();
//cwe.FirstEvent += firstEventHandler;
//cwe.CallEvent(34);
//cwe.SomeThreadSafeEvent += SomeThreadSafeEventHandler;
//cwe.CallEvent_TS(989);
//Console.WriteLine(new string('-', 80));
//cwe.SomeThreadSafeEvent -= SomeThreadSafeEventHandler;
//cwe.CallEvent_TS(989);
// -- async delegates
SampleDelegate counter = new SampleDelegate(CountCharacters);
SampleDelegate parser = new SampleDelegate(Parse);
// EndInvoke blocks main thread and wait for result
//IAsyncResult counterResult = counter.BeginInvoke("hello", null, null);
//IAsyncResult parserResult = parser.BeginInvoke("20", null, null);
//Console.WriteLine("Main thread continued.");
//Console.WriteLine("Counter returned : {0}",counter.EndInvoke(counterResult));
//Console.WriteLine("Parser returned : {0}",parser.EndInvoke(parserResult));
// EndInvoke not blocks main thread
AsyncCallback callBack = new AsyncCallback((result) =>
{
string format = result.AsyncState as string;
AsyncResult delefateResult = result as AsyncResult;
SampleDelegate delegateInstance = delefateResult.AsyncDelegate as SampleDelegate;
if (delegateInstance != null)
{
Console.WriteLine(format, delegateInstance.EndInvoke(result));
}
});
counter.BeginInvoke("hello", callBack, "Counter returned {0}");
parser.BeginInvoke("10", callBack, "Parser returned {0}");
Console.WriteLine("Main thread continued.");
Console.WriteLine("Done.");
Console.ReadLine();
}
