//EndInvokeによるブロッキング
static void BlockingEndInvoke()
{
// The asynchronous method puts the thread id here.
int threadId;
// Create an instance of the test class.
AsyncDemo ad = new AsyncDemo();
// Create the delegate.
AsyncMethodCaller caller = new AsyncMethodCaller(ad.TestMethod);
// Initiate the asychronous call.
// デリゲートを同じ引き数＋コールバック関数＋コールバック引数となります。
IAsyncResult result = caller.BeginInvoke(3000,
out threadId, null, null);
Thread.Sleep(0);
Console.WriteLine("Main thread {0} does some work.",
Thread.CurrentThread.ManagedThreadId);
// Call EndInvoke to wait for the asynchronous call to complete,
// and to retrieve the results.
string returnValue = caller.EndInvoke(out threadId, result);
Console.WriteLine("The call executed on thread {0}, with return value \"{1}\".",
threadId, returnValue);
}
//WaitHandle による非同期呼び出しの待機
static void BlockingWaitHandle()
{
// スレッドID保存用の変数を宣言
int threadId;
//AsyncDemoクラスをインスタンス化
AsyncDemo ad = new AsyncDemo();
//AsyncDemoのデリゲート型を使用してデリゲートを作成
AsyncMethodCaller caller = new AsyncMethodCaller(ad.TestMethod);
// デリゲートのBeginInvokeを使用してThreadPoolで処理を開始
// 引数#1はデリゲートの引数１引数#2はデリゲートの第二引数
// #3,コールバック関数を利用する場合、#4はコールバック関数の引数
IAsyncResult result = caller.BeginInvoke(3000,
out threadId, null, null);
Thread.Sleep(0);
Console.WriteLine("Main thread {0} does some work.",
Thread.CurrentThread.ManagedThreadId);
// Wait for the WaitHandle to become signaled.
result.AsyncWaitHandle.WaitOne();
// Perform additional processing here.
// Call EndInvoke to retrieve the results.
string returnValue = caller.EndInvoke(out threadId, result);
// Close the wait handle.
result.AsyncWaitHandle.Close();
Console.WriteLine("The call executed on thread {0}, with return value \"{1}\".",
threadId, returnValue);
}
//非同期呼び出し完了じのコールバックによる待機
static void BlockingCollBack()
{
// Create an instance of the test class.
AsyncDemo ad = new AsyncDemo();
// Create the delegate.
AsyncMethodCaller caller = new AsyncMethodCaller(ad.TestMethod);
// The threadId parameter of TestMethod is an out parameter, so
// its input value is never used by TestMethod. Therefore, a dummy
// variable can be passed to the BeginInvoke call. If the threadId
// parameter were a ref parameter, it would have to be a class-
// level field so that it could be passed to both BeginInvoke and
// EndInvoke.
int dummy = 0;
// Initiate the asynchronous call, passing three seconds (3000 ms)
// for the callDuration parameter of TestMethod; a dummy variable
// for the out parameter (threadId); the callback delegate; and
// state information that can be retrieved by the callback method.
// In this case, the state information is a string that can be used
// to format a console message.
IAsyncResult result = caller.BeginInvoke(3000,
out dummy,
new AsyncCallback(CallbackMethod),
"The call executed on thread {0}, with return value \"{1}\".");
Console.WriteLine("The main thread {0} continues to execute...",
Thread.CurrentThread.ManagedThreadId);
// mainスレッドを待機させる3秒以上待機させても問題ない。
//Thread.Sleep(4000);
// Wait for the WaitHandle to become signaled.
result.AsyncWaitHandle.WaitOne();
Console.WriteLine("The main thread ends.");
}
//非同期呼び出し完了のポーリングによる待機
static void BlockingIsCompleted()
{
// The asynchronous method puts the thread id here.
int threadId;
// Create an instance of the test class.
AsyncDemo ad = new AsyncDemo();
// Create the delegate.
AsyncMethodCaller caller = new AsyncMethodCaller(ad.TestMethod);
// Initiate the asychronous call.
IAsyncResult result = caller.BeginInvoke(3000,
out threadId, null, null);
// Poll while simulating work.ここでポーリング確認
while (result.IsCompleted == false)
{
Thread.Sleep(250);
Console.Write(".");
}
// Call EndInvoke to retrieve the results.
string returnValue = caller.EndInvoke(out threadId, result);
Console.WriteLine("\nThe call executed on thread {0}, with return value \"{1}\".",
threadId, returnValue);
}