public bool Invoke(int duration, object sender, EventArgs e)
{
CancellationTokenSource cts = new CancellationTokenSource();
CancellationToken token = cts.Token;
IAsyncResult result = handler.BeginInvoke(sender, e, null, null);// obj.BeginInvoke(token, null, null);
new Thread(() =>
{
Thread.Sleep(duration);
if (result.IsCompleted != true)
{
token.ThrowIfCancellationRequested();
}
}).Start();
try
{
obj.EndInvoke(result);
Console.WriteLine("\nOperation finished successfully.");
return(true);
}
catch (OperationCanceledException)
{
Console.WriteLine("\nOperation was canceled.");
return(false);
}
}
static void Main(string[] args)
{
int result;
//往委托列表中添加方法
MyDelegate d = Add;
//调用BeginInvoke 方法用于启动异步调用
Console.WriteLine("异步调用MyDelegate 开始");
//接受异步调用后的结果
IAsyncResult iar = d.BeginInvoke(123, 456, out result, null, null);
//循环模拟其他操作，每隔500MS打一个 . 号
for (int i = 0; i < 10; i++)
{
Thread.Sleep(500);
Console.Write(".");
}
Console.WriteLine("等待");
//使用IAsyncResult.AsyncWaitHandle获取WaitHandle
//使用WaitOne方法执行 阻塞等待
//异步调用完成时会发出WaitHandle信号,可通过WaitOne等待
iar.AsyncWaitHandle.WaitOne();
Console.WriteLine("异步调用 Add()方法");
//使用EndInvoke方法检索异步调用结果
//EndInvoke方法：若异步调用未完成，EndInvoke将阻塞到异步调用完成
d.EndInvoke(out result, iar);
//等待调用完成，输出结果
Console.WriteLine("异步调用 Add结果:{0}", result);
}
public static void MyCallBack(IAsyncResult ar)
{
MyDelegate d = (MyDelegate)((AsyncResult)ar).AsyncDelegate;
d.EndInvoke(ar);
//Console.WriteLine( "Ola" + );
}
private void button1_Click(object sender, EventArgs e)
{
//Task t = DoSomethingAsync();
//Task t = new Task(Test);
//t.Start();
button1.Enabled = false;
MyDelegate myDel = AsyncMethod;
IAsyncResult rs = myDel.BeginInvoke(10000, null, null);
while (!rs.IsCompleted)
{
//label1.Text = "...";
//Thread.Sleep(10);
}
string res = myDel.EndInvoke(rs);
label1.Text = res;
BeginInvoke(new MethodInvoker(delegate()
{
button1.Enabled = true;
}));
}
static void Main(string[] args)
{
int result;
MyDelegate d = Add;//创建委托实例
//调用BeginInvoke方法用于启动异步调用
Console.WriteLine("委托异步调用方法开始:");
IAsyncResult iar = d.BeginInvoke(123, 456, out result, null, null);
Console.Write("执行其他操作");
for (int i = 0; i < 10; i++)
{
Thread.Sleep(500);
Console.Write(".");
}
Console.WriteLine("等待");
//使用IAsyncResult.AsyncWaitHandle获取WaitHandle,使用WaitOne方法执行
//阻塞等待，异步完成之时会发出WaitHandle信号，可通过WaitOne等待
iar.AsyncWaitHandle.WaitOne();
Console.WriteLine("异步调用AsyncDelegate.Add()方法结束");
//EndInvoke方法：若异步调用未完成，EndInvoke将一直阻塞到异步调用完成
d.EndInvoke(out result, iar);
Console.WriteLine("异步调用异步调用AsyncDelegate.Add()方法结果:{0}", result);
Console.ReadKey();
}
static void Main(string[] args)
{
MyDelegate d = Square;
System.Console.WriteLine("Thread-Id: {0}", Thread.CurrentThread.ManagedThreadId);
IAsyncResult iar = d.BeginInvoke(12, null, null);
while (!iar.IsCompleted)
{
System.Console.WriteLine("Blabla");
}
int result = d.EndInvoke(iar);
System.Console.WriteLine(result);
// Process[] processList = Process.GetProcesses(".");
// foreach(Process process in processList){
// System.Console.WriteLine("PID: {0}, Process-name: {1}", process.Id, process.ProcessName);
// }
// Process cal = Process.Start("cal");
// Thread.Sleep(5000);
// cal.Kill();
}
public void 基础()
{
//建立委托
MyDelegate myDelegate = new MyDelegate(Hello);
//异步调用委托，获取计算结果
IAsyncResult result = myDelegate.BeginInvoke("Leslie", null, null);
//在异步线程未完成前执行其他工作
while (!result.IsCompleted)
{
Thread.Sleep(200); //虚拟操作
Console.WriteLine("Main thead do work!");
}
//也可以使用WailHandle完成同样的工作，WaitHandle里面包含有方法WaitOne，与使用 IAsyncResult.IsCompleted 同样且更方便
while (!result.AsyncWaitHandle.WaitOne(200))
{
Console.WriteLine("Main thead do work!");
}
//等待异步方法完成，调用EndInvoke(IAsyncResult)获取运行结果
string data = myDelegate.EndInvoke(result);
// EndInvoke执行完毕，取得之前传递的参数内容
string strState = (string)result.AsyncState;
Console.WriteLine(data);
}
private void Btn_Start_Click(object sender, EventArgs e)
{
MyDelegate myDelegate = new MyDelegate((string para) =>
{
System.Diagnostics.Trace.WriteLine("delegate thread:" + Thread.CurrentThread.ManagedThreadId);
Thread.Sleep(3000);
return(para.Length);
});
IAsyncResult result = myDelegate.BeginInvoke("Leslie", null, null);
System.Diagnostics.Trace.WriteLine("start invoke");
using (WebClient wc = new WebClient())
{
Tb_ThreadInfo.Text = wc.DownloadString(new Uri("http://www.cnblogs.com"));
System.Diagnostics.Trace.WriteLine("download ok:" + Tb_ThreadInfo.Text.Length);
}
System.Diagnostics.Trace.WriteLine("main thread:" + Thread.CurrentThread.ManagedThreadId);
int data = myDelegate.EndInvoke(result);
System.Diagnostics.Trace.WriteLine("result:" + data.ToString());
}
static void Main(string[] args)
{
MyDelegate myFun = TaskWhile;
IAsyncResult result = myFun.BeginInvoke(1, 3000, null, null);
while (!result.IsCompleted)
{
Console.Write(".");
Thread.Sleep(50);
}
int i = myFun.EndInvoke(result);
Console.WriteLine("异步委托返回结果是:{0}", i);
MyDelegate myFun1 = TaskWhile;
IAsyncResult result1 = myFun1.BeginInvoke(1, 2000, null, null);
while (!result1.IsCompleted)
{
Console.Write(".");
Thread.Sleep(50);
}
int j = myFun1.EndInvoke(result1);
Console.WriteLine("异步委托返回结果是:{0}", j);
}
//【5】创建回调函数
private void MyCallback(IAsyncResult result)
{
int res = objCal.EndInvoke(result);
//异步显示结果
Console.WriteLine("第{0}个计算结果：{1}", result.AsyncState, res);
}
private void button1_Click(object sender, EventArgs e)
{
MyDelegate add = new MyDelegate(Add);
IAsyncResult addResult = add.BeginInvoke(5, 10, null, null);
int result = add.EndInvoke(addResult);
MessageBox.Show("5 + 10 = " + result);
}
static void AsyncMethodComplete(IAsyncResult iar)
{
Console.WriteLine("Aszinkron szál kész...");
AsyncResult result = (AsyncResult)iar;
MyDelegate d = (MyDelegate)result.AsyncDelegate;
Console.WriteLine("Üzenet: {0}", iar.AsyncState);
Console.WriteLine("Eredmény: {0}", d.EndInvoke(iar));
}
static void Main(string[] args)
{
MyDelegate mydelegate = new MyDelegate(TestMethod);
IAsyncResult result = mydelegate.BeginInvoke("abcdefg", TestCallBack, "hijklmn");
string resultstr = mydelegate.EndInvoke(result);
Console.WriteLine(resultstr);
Console.ReadKey();
}
static void ThreadProc(IAsyncResult stateInfo)
{
MyDelegate delegat = ((object[])(stateInfo.AsyncState))[0] as MyDelegate;
string info = ((object[])(stateInfo.AsyncState))[1] as string;
AutoResetEvent ev = ((object[])(stateInfo.AsyncState))[2] as AutoResetEvent;
Console.WriteLine(info + ": " + delegat.EndInvoke(stateInfo).ToString());
ev.Set();
}
static void Main(string[] args)
{
MyDelegate my = new MyDelegate(Add);
AsyncCallback callback = new AsyncCallback(AddCompletion);
IAsyncResult result = my.BeginInvoke(10, 20, callback, "qwerty");
int res = my.EndInvoke(result);
Console.WriteLine("10 + 20 = " + res);
Thread.Sleep(1000);
}
static void Main(string[] args)
{
MyDelegate mydelegate = new
MyDelegate(TestdelMethod);
IAsyncResult res = mydelegate.BeginInvoke("Thread param", TestCallBack, "callback param");
string resstr = mydelegate.EndInvoke(res);
Console.WriteLine(resstr);
Console.ReadKey();
}
public void CommandCallBack(IAsyncResult ar)
{
// this is called when your task is complete
AsyncResult asyncResult = (AsyncResult)ar;
MyDelegate myDel = (MyDelegate)asyncResult.AsyncDelegate;
WorkerClass command = myDel.EndInvoke(ar);
// command is a reference to the original class that envoked the async call
// m_test will equal "Hi"
// m_test2 will equal "Later";
}
//执行完异步回调函数
public static void TestCallback(IAsyncResult data)
{
Console.WriteLine("Callback: {0}", num);
AsyncResult ar = (AsyncResult)data;
MyDelegate del = (MyDelegate)ar.AsyncDelegate;
String res = del.EndInvoke(data);
Console.WriteLine("{0}, result is {1}", ar.AsyncState, res);
}
private void button4_Click(object sender, EventArgs e)
{
MyDelegate dele = new MyDelegate(TestMethod);
//第一个参数回调成功后的结果，第二个参数执行的回调函数
IAsyncResult result = dele.BeginInvoke("Thread PARMA", AsyncResult, "CallBACK PARAM");
//异步完成结果
string str = dele.EndInvoke(result);
MessageBox.Show(str);
}
static void Completed(IAsyncResult result)
{
ThreadMessage("Async Completed");
AsyncResult _result = (AsyncResult)result;
MyDelegate myDelegate = (MyDelegate)_result.AsyncDelegate;
//获取委托对象，调用EndInvoke方法获取运行结果
string data = myDelegate.EndInvoke(_result);
Console.WriteLine(data);
}
private void button2_Click(object sender, EventArgs e)
{
MyDelegate add = new MyDelegate(Add);
IAsyncResult addResult = add.BeginInvoke(1, 6, null, null);
if (addResult.IsCompleted)
{
int result = add.EndInvoke(addResult);
MessageBox.Show("1 + 6 = " + result);
}
}
public static void MyCallBack(IAsyncResult ar)
{
//获取当前的异步执行结果
AsyncResult myResult = (AsyncResult)ar;
//获取当前的委托对象 m1
MyDelegate mmm1 = (MyDelegate)myResult.AsyncDelegate;
string data = mmm1.EndInvoke(myResult);
Console.WriteLine(data);
}
//供异步线程完成回调的方法
static void Completed(IAsyncResult result)
{
//获取委托对象，调用EndInvoke方法获取运行结果
AsyncResult _result = (AsyncResult)result;
MyDelegate myDelegaate = (MyDelegate)_result.AsyncDelegate;
//获得参数
string data = myDelegaate.EndInvoke(_result);
Console.WriteLine(data);
//异步线程执行完毕
Console.WriteLine("异步线程完成咯！");
Console.WriteLine("回调函数也是由" + Thread.CurrentThread.Name + "调用的！");
}
//BeginInvoke() 除了最后两个参数，前面的都是你可定义的
/// <summary>
/// 这种方法有一个缺点，就是不知道异步操作什么时候执行完，什么时候开始调用EndInvoke，因为一旦EndInvoke主线程就会处于阻塞等待状态。
/// </summary>
public void Process()
{
//建立委托
MyDelegate myDelegate = new MyDelegate(GetString);
//异步调用委托，除最后两个参数外，前面的参数都可以传进去
IAsyncResult result = myDelegate.BeginInvoke("张三", 22, null, null);
Console.WriteLine($"主线程继续工作!,线程ID：{Thread.CurrentThread.ManagedThreadId}");
//调用EndInvoke(IAsyncResult)获取运行结果，一旦调用了EndInvoke，即使结果还没来得及返回，主线程也阻塞等待了
//注意获取返回值的方式
string data = myDelegate.EndInvoke(result);
Console.WriteLine($"线程ID:{Thread.CurrentThread.ManagedThreadId},异步委托结果：{data}");
}
static void Main()
{
List <int> someInts = new List <int> {
1, 2, 3, 4, 5, 6, 7
};
MyDelegate test = FinalResult;
test.BeginInvoke(someInts, ar =>
{
MyDelegate del = (MyDelegate)ar.AsyncState;
Console.WriteLine(del.EndInvoke(ar));
}, test);
Console.ReadKey(true);
}
//当要监视多个运行对象的时候，使用IAsyncResult.WaitHandle.WaitOne可就派不上用场了。
static void WaitAny用法(string[] args)
{
ThreadMessage("Main Thread");
//建立委托
MyDelegate myDelegate = new MyDelegate(Hello);
//异步调用多个委托
IAsyncResult result1 = myDelegate.BeginInvoke("Leslie", null, null);
IAsyncResult result2 = myDelegate.BeginInvoke("Leslie", null, null);
//此处可加入多个检测对象
WaitHandle[] waitHandleList = new WaitHandle[] { result1.AsyncWaitHandle, result2.AsyncWaitHandle };
while (!WaitHandle.WaitAll(waitHandleList, 200))
{
Console.WriteLine("Main thead do work!");
}
string data1 = myDelegate.EndInvoke(result1);
string data2 = myDelegate.EndInvoke(result2);
Console.WriteLine(data1 + data2);
Console.ReadKey();
}
static void Completed(IAsyncResult result)
{
ThreadMessage("Async Completed");
//获取委托对象，调用EndInvoke方法获取运行结果
AsyncResult _result = (AsyncResult)result;
MyDelegate myDelegate = (MyDelegate)_result.AsyncDelegate;
string data = myDelegate.EndInvoke(_result);
//获取Person对象
Person person = (Person)result.AsyncState;
string message = person.Name + "'s age is " + person.Age.ToString();
Console.WriteLine(data + "\n" + message);
}
public static void Main(string[] args)
{
var d = new MyDelegate(Func);
IAsyncResult result = d.BeginInvoke(10, null, null);
while (!result.IsCompleted)
{
Console.WriteLine("Main Waiting");
Thread.Sleep(125);
}
string retval = d.EndInvoke(result);
Console.WriteLine("Delegate call returned: {0}", retval);
}
private void btnExecute2_Click(object sender, EventArgs e)
{
MyDelegate dete = ExecuteTask1;
//异步操作执行状态借口
IAsyncResult result = dete.BeginInvoke(10, null, null);
this.lblCount1.Text = "正在计算......";
this.lblCount2.Text = ExecuteTask2(10).ToString();
//EndInvoke方法借助IAsyncResult借口对象，不断地查询异步调用是否结束；
//该方法知道异步调用的方法所有参数，所以异步调用完毕以后，取出异步调用结果作为返回值
int res = dete.EndInvoke(result);
this.lblCount1.Text = res.ToString();
}
private void Completed(IAsyncResult result)
{
//获取委托对象，调用EndInvoke方法获取运行结果
AsyncResult _result = (AsyncResult)result; //此句是核心点
MyDelegate myDelegate = (MyDelegate)_result.AsyncDelegate;
//获得参数
string data = myDelegate.EndInvoke(result);
Console.WriteLine($"线程ID:{Thread.CurrentThread.ManagedThreadId},异步委托结果：{data}");
//异步线程执行完毕
Console.WriteLine("异步线程完成咯！");
Console.WriteLine("回调函数也是由[" + Thread.CurrentThread.Name + "]调用的！");
}
static void Main(string[] args)
{
MyDelegate asyncCall = new MyDelegate(Sum);
Console.WriteLine("Starting method async.");
IAsyncResult status = asyncCall.BeginInvoke(5, 6, null, null);
Console.WriteLine("Async method is working");
Console.WriteLine("Calling EndInvoke()");
int result = asyncCall.EndInvoke(status);
Console.WriteLine("EndInvoke() returned");
Console.WriteLine("Result={0}", result);
}
public override void ShowUsage()
{
ThreadMessage("Main Thread");
//创建委托
MyDelegate myDelegate = new MyDelegate(Hello);
//如果在使用myDelegate.BeginInvoke后立即调用myDelegate.EndInvoke，在异步线程未完成工作以前主线程将处于阻塞状态，等到异步线程结束获取计算结果后，主线程才能继续工作，这明显无法展示出多线程的优势。此时可以好好利用IAsyncResult 提高主线程的工作性能
Console.WriteLine("请选择使用何种方式发起异步线程未完成状态的判断？");
Console.WriteLine("1):轮询IsCompleted 2):WaitOne 3)WaiAll 4)回调函数");
//在异步线程未完成前执行其他工作
ConsoleKeyInfo key = Console.ReadKey(true);
//记录开始任务时的时间
DateTime startWorkTime = DateTime.Now;
if (key.Key == ConsoleKey.D1 || key.Key == ConsoleKey.D2 || key.Key == ConsoleKey.D3)
{
//异步调用委托，获取计算结果
IAsyncResult result = myDelegate.BeginInvoke("Frost", null, null);
switch (key.Key)
{
#region 1、轮询result.IsCompleted属性
case ConsoleKey.D1:
while (!result.IsCompleted)
{
Thread.Sleep(200); //虚拟操作
TimeSpan timeSpan = DateTime.Now - startWorkTime;
Console.WriteLine("This is reported by main thread, async thread has done work for {0} ms.", timeSpan.TotalMilliseconds);
}
break;
#endregion
#region 2、WaitOne属性判断
//除此以外，也可以使用WailHandle完成同样的工作，WaitHandle里面包含有一个方法WaitOne（int timeout），它可以判断委托是否完成工作，在工作未完成前主线程可以继续其他工作。运行下面代码可得到与使用 IAsyncResult.IsCompleted 同样的结果，而且更简单方便 。
case ConsoleKey.D2:
while (!result.AsyncWaitHandle.WaitOne(200))
{
TimeSpan timeSpan = DateTime.Now - startWorkTime;
Console.WriteLine("This is reported by main thread, async thread has done work for {0} ms.", timeSpan.TotalMilliseconds);
}
break;
#endregion
#region 3、WaitAll属性判断
//当要监视多个运行对象的时候，使用IAsyncResult.WaitHandle.WaitOne可就派不上用场了。
//幸好.NET为WaitHandle准备了另外两个静态方法：WaitAny（waitHandle[], int）与WaitAll (waitHandle[] , int)。
//其中WaitAll在等待所有waitHandle完成后再返回一个bool值。
//而WaitAny是等待其中一个waitHandle完成后就返回一个int，这个int是代表已完成waitHandle在waitHandle[]中的数组索引。
//下面就是使用WaitAll的例子，运行结果与使用 IAsyncResult.IsCompleted 相同。
//等待异步方法完成，调用EndInvoke获取运行结果
case ConsoleKey.D3:
//加入所有检测对象
WaitHandle[] waitList = new WaitHandle[] { result.AsyncWaitHandle };
while (!WaitHandle.WaitAll(waitList, 200))
{
TimeSpan timeSpan = DateTime.Now - startWorkTime;
Console.WriteLine("Work has being doing for {0} ms.", timeSpan.TotalMilliseconds);
}
break;
#endregion
}
string data = myDelegate.EndInvoke(result);
Console.WriteLine(data);
}
else if (key.Key == ConsoleKey.D4)
{
#region 4、回调函数
//使用轮询方式来检测异步方法的状态非常麻烦，而且效率不高，有见及此，.NET为 IAsyncResult BeginInvoke（AsyncCallback , object）准备了一个回调函数。使用 AsyncCallback 就可以绑定一个方法作为回调函数，回调函数必须是带参数 IAsyncResult 且无返回值的方法： void AsycnCallbackMethod(IAsyncResult result) 。在BeginInvoke方法完成后，系统就会调用AsyncCallback所绑定的回调函数,最后回调函数中调用 XXX EndInvoke（IAsyncResult result) 就可以结束异步方法，它的返回值类型与委托的返回值一致。
//建立Person对象，用作参数
Person person = new Person();
person.Name = "Elva";
person.Age = 27;
//第一个参数为委托方法对应的参数，第二个为回调函数，第三个为传入的参数
IAsyncResult result = myDelegate.BeginInvoke("Frost", new AsyncCallback(Completed), person);
while (!result.IsCompleted)
{
Thread.Sleep(200); //虚拟操作
TimeSpan timeSpan = DateTime.Now - startWorkTime;
Console.WriteLine("This is reported by main thread, async thread has done work for {0} ms.", timeSpan.TotalMilliseconds);
}
//可以看到，主线在调用BeginInvoke方法可以继续执行其他命令，而无需再等待了，这无疑比使用轮询方式判断异步方法是否完成更有优势。
//在异步方法执行完成后将会调用AsyncCallback所绑定的回调函数，注意一点，回调函数依然是在异步线程中执行，这样就不会影响主线程的运行，这也使用回调函数最值得青昧的地方。
//在回调函数中有一个既定的参数IAsyncResult,把IAsyncResult强制转换为AsyncResult后，就可以通过 AsyncResult.AsyncDelegate 获取原委托，再使用EndInvoke方法获取计算结果。
#endregion
}
Console.ReadKey();
}
