public static void ChapterMain()
{
// Use Task.Factory.StartNew<string>() for
// TPL prior to .NET 4.5
Task <string> task =
Task.Run <string>(
() => PiCalculator.Calculate(100));
foreach (
char busySymbol in Utility.BusySymbols())
{
if (task.IsCompleted)
{
Console.Write('\b');
break;
}
Console.Write(busySymbol);
}
Console.WriteLine();
Console.WriteLine(task.Result);
if (!task.IsCompleted)
{
throw new Exception("Task Should Be Completed");
}
}
public static void Main()
{
// Use Task.Factory.StartNew<string>() for
// TPL prior to .NET 4.5
Task <string> task =
Task.Run <string>(
() => PiCalculator.Calculate(100));
foreach (
char busySymbol in Utility.BusySymbols())
{
if (task.IsCompleted)
{
Console.Write('\b');
break;
}
Console.Write(busySymbol);
}
Console.WriteLine();
Console.WriteLine(task.Result);
System.Diagnostics.Trace.Assert(
task.IsCompleted);
}
public static void ChapterMain()
{
Task <string> task = Task.Factory.StartNew <string>(
() => PiCalculator.Calculate(10));
Task faultedTask = task.ContinueWith(
(antecedentTask) =>
{
Trace.Assert(task.IsFaulted);
Console.WriteLine("Task State: Faulted");
},
TaskContinuationOptions.OnlyOnFaulted);
Task canceledTask = task.ContinueWith(
(antecedentTask) =>
{
Trace.Assert(task.IsCanceled);
Console.WriteLine("Task State: Canceled");
},
TaskContinuationOptions.OnlyOnCanceled);
Task completedTask = task.ContinueWith(
(antecedentTask) =>
{
Trace.Assert(task.IsCompleted);
Console.WriteLine("Task State: Completed");
},
TaskContinuationOptions.OnlyOnRanToCompletion);
completedTask.Wait();
}
private void CalculatePi(IAsyncAction operation)
{
if (isStopped)
{
return;
}
string result = PiCalculator.Calculate(PI_DIGITS);
Debug.WriteLine(result);
}
public static void ChapterMain()
{
string pi = null;
const int iterations = TotalDigits / BatchSize;
for (int i = 0; i < iterations; i++)
{
pi += PiCalculator.Calculate(
BatchSize, i * BatchSize);
}
Console.WriteLine(pi);
}
public static void Main()
{
string pi = null;
const int iterations = TotalDigits / BatchSize;
string[] sections = new string[iterations];
//TPL提供了一个辅助方法，并行迭代
Parallel.For(0, iterations, (i) =>
{
sections[i] = PiCalculator.Calculate(BatchSize, i * BatchSize);
});
pi = string.Join("", sections);
Console.WriteLine(pi);
}
public static void ChapterMain()
{
string pi = null;
int iterations = TotalDigits / BatchSize;
string[] sections = new string[iterations];
Parallel.For(0, iterations, (i) =>
{
sections[i] += PiCalculator.Calculate(
BatchSize, i * BatchSize);
});
pi = string.Join("", sections);
Console.WriteLine(pi);
}
private static void WritePi(
CancellationToken cancellationToken)
{
const int batchSize = 1;
string piSection = string.Empty;
int i = 0;
while (!cancellationToken.IsCancellationRequested ||
i == int.MaxValue)
{
piSection = PiCalculator.Calculate(
batchSize, (i++) * batchSize);
Console.Write(piSection);
}
}
public static void ChapterMain()
{
// Use Task.Factory.StartNew<string>() for
// TPL prior to .NET 4.5
Task <string> task =
Task.Run <string>(
() => PiCalculator.Calculate(10));
Task faultedTask = task.ContinueWith(
(antecedentTask) =>
{
if (!antecedentTask.IsFaulted)
{
throw new Exception("Antecedent Task Should Be Faulted");
}
Console.WriteLine(
"Task State: Faulted");
},
TaskContinuationOptions.OnlyOnFaulted);
Task canceledTask = task.ContinueWith(
(antecedentTask) =>
{
if (!antecedentTask.IsCanceled)
{
throw new Exception("Antecedent Task Should Be Canceled");
}
Console.WriteLine(
"Task State: Canceled");
},
TaskContinuationOptions.OnlyOnCanceled);
Task completedTask = task.ContinueWith(
(antecedentTask) =>
{
if (!antecedentTask.IsCompleted)
{
throw new Exception("Antecedent Task Should Be Completed");
}
Console.WriteLine(
"Task State: Completed");
}, TaskContinuationOptions.
OnlyOnRanToCompletion);
completedTask.Wait();
}
public void CalculateAsync <TState>(
int digits,
CancellationToken cancelToken,
TState userState)
{
Task <string> .Factory.StartNew(
() => PiCalculator.Calculate(digits), cancelToken)
.ContinueWith <string>(
continueTask =>
{
CalculateCompleted(typeof(PiCalculator),
new CalculateCompletedEventArgs(
continueTask.Result,
continueTask.Exception,
cancelToken.IsCancellationRequested,
userState));
return(continueTask.Result);
});
}
public void CalculateAsync <TState>(
int digits,
CancellationToken cancelToken
= default(CancellationToken),
TState userState
= default(TState))
{
SynchronizationContext.
SetSynchronizationContext(
AsyncOperationManager.
SynchronizationContext);
// Ensure the continuation runs on the current
// thread, and that therefore the event will
// be raised on the same thread that called
// this method in the first place.
TaskScheduler scheduler =
TaskScheduler.
FromCurrentSynchronizationContext();
Task.Run(
() =>
{
return(PiCalculator.Calculate(digits));
}, cancelToken)
.ContinueWith(
continueTask =>
{
Exception exception =
continueTask.Exception == null ?
continueTask.Exception :
continueTask.Exception.
InnerException;
CalculateCompleted(
typeof(PiCalculator),
new CalculateCompletedEventArgs(
continueTask.Result,
exception,
cancelToken.IsCancellationRequested,
userState));
}, scheduler);
}
static void Main(string[] args)
{
Task <string> task = Task.Run <string>(() => PiCalculator.Calculate(100000));
foreach (var busySymbol in Utility.BusySymbols())
{
if (task.IsCompleted)
{
Console.WriteLine('\b');
break;
}
Console.WriteLine(busySymbol);//太快的话，这会被忽略
}
Console.WriteLine();
Console.WriteLine(task.Result); //会阻塞调用任务室外线程
System.Diagnostics.Trace.Assert(task.IsCompleted); //判断task.IsCompleted真假，false则出现弹框
}
public static void Main()
{
Task <string> task = Task.Factory.StartNew <string>(
() => PiCalculator.Calculate(100));
foreach (char busySymbol in Utility.BusySymbols())
{
if (task.IsCompleted)
{
Console.Write('\b');
break;
}
Console.Write(busySymbol);
}
Console.WriteLine();
// Blocks until task completes.
Console.WriteLine(task.Result);
Trace.Assert(task.IsCompleted);
}
