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// <copyright>
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
namespace System.Runtime
{
using System.Runtime.CompilerServices;
using System.Threading;
using System.Threading.Tasks;
internal static class TaskExtensions
{
public static IAsyncResult AsAsyncResult<T>(this Task<T> task, AsyncCallback callback, object state)
{
if (task == null)
{
throw Fx.Exception.ArgumentNull("task");
}
if (task.Status == TaskStatus.Created)
{
throw Fx.Exception.AsError(new InvalidOperationException(InternalSR.SFxTaskNotStarted));
}
var tcs = new TaskCompletionSource<T>(state);
task.ContinueWith(
t =>
{
if (t.IsFaulted)
{
tcs.TrySetException(t.Exception.InnerExceptions);
}
else if (t.IsCanceled)
{
// the use of Task.ContinueWith(,TaskContinuationOptions.OnlyOnRanToCompletion)
// can give us a cancelled Task here with no t.Exception.
tcs.TrySetCanceled();
}
else
{
tcs.TrySetResult(t.Result);
}
if (callback != null)
{
callback(tcs.Task);
}
},
TaskContinuationOptions.ExecuteSynchronously);
return tcs.Task;
}
public static IAsyncResult AsAsyncResult(this Task task, AsyncCallback callback, object state)
{
if (task == null)
{
throw Fx.Exception.ArgumentNull("task");
}
if (task.Status == TaskStatus.Created)
{
throw Fx.Exception.AsError(new InvalidOperationException(InternalSR.SFxTaskNotStarted));
}
var tcs = new TaskCompletionSource<object>(state);
task.ContinueWith(
t =>
{
if (t.IsFaulted)
{
tcs.TrySetException(t.Exception.InnerExceptions);
}
else if (t.IsCanceled)
{
// the use of Task.ContinueWith(,TaskContinuationOptions.OnlyOnRanToCompletion)
// can give us a cancelled Task here with no t.Exception.
tcs.TrySetCanceled();
}
else
{
tcs.TrySetResult(null);
}
if (callback != null)
{
callback(tcs.Task);
}
},
TaskContinuationOptions.ExecuteSynchronously);
return tcs.Task;
}
public static ConfiguredTaskAwaitable SuppressContextFlow(this Task task)
{
return task.ConfigureAwait(false);
}
public static ConfiguredTaskAwaitable<T> SuppressContextFlow<T>(this Task<T> task)
{
return task.ConfigureAwait(false);
}
public static ConfiguredTaskAwaitable ContinueOnCapturedContextFlow(this Task task)
{
return task.ConfigureAwait(true);
}
public static ConfiguredTaskAwaitable<T> ContinueOnCapturedContextFlow<T>(this Task<T> task)
{
return task.ConfigureAwait(true);
}
public static void Wait<TException>(this Task task)
{
try
{
task.Wait();
}
catch (AggregateException ex)
{
throw Fx.Exception.AsError<TException>(ex);
}
}
public static bool Wait<TException>(this Task task, int millisecondsTimeout)
{
try
{
return task.Wait(millisecondsTimeout);
}
catch (AggregateException ex)
{
throw Fx.Exception.AsError<TException>(ex);
}
}
public static bool Wait<TException>(this Task task, TimeSpan timeout)
{
try
{
if (timeout == TimeSpan.MaxValue)
{
return task.Wait(Timeout.Infinite);
}
else
{
return task.Wait(timeout);
}
}
catch (AggregateException ex)
{
throw Fx.Exception.AsError<TException>(ex);
}
}
public static void Wait(this Task task, TimeSpan timeout, Action<Exception, TimeSpan, string> exceptionConverter, string operationType)
{
bool timedOut = false;
try
{
if (timeout > TimeoutHelper.MaxWait)
{
task.Wait();
}
else
{
timedOut = !task.Wait(timeout);
}
}
catch (Exception ex)
{
if (Fx.IsFatal(ex) || exceptionConverter == null)
{
throw;
}
exceptionConverter(ex, timeout, operationType);
}
if (timedOut)
{
throw Fx.Exception.AsError(new TimeoutException(InternalSR.TaskTimedOutError(timeout)));
}
}
public static Task<TBase> Upcast<TDerived, TBase>(this Task<TDerived> task) where TDerived : TBase
{
return (task.Status == TaskStatus.RanToCompletion) ?
Task.FromResult((TBase)task.Result) :
UpcastPrivate<TDerived, TBase>(task);
}
private static async Task<TBase> UpcastPrivate<TDerived, TBase>(this Task<TDerived> task) where TDerived : TBase
{
return await task.ConfigureAwait(false);
}
}
}
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