网上演练
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

96 lines
3.3 KiB

#if NET20 || NET30 || NET35 || !NET_4_6
using System.Diagnostics.Contracts;
namespace System.Threading.Tasks
{
public partial class Task<TResult> : Task
{
internal TResult InternalResult;
static Task()
{
ContinuationConvertion = done => (Task<TResult>)done.Result;
}
public Task(Func<TResult> function)
: base(function, null, null, default(CancellationToken), TaskCreationOptions.None, InternalTaskOptions.None, TaskScheduler.Default)
{
// Empty
}
public Task(Func<TResult> function, CancellationToken cancellationToken)
: base(function, null, null, cancellationToken, TaskCreationOptions.None, InternalTaskOptions.None, TaskScheduler.Default)
{
// Empty
}
public Task(Func<TResult> function, TaskCreationOptions creationOptions)
: base(function, null, null, default(CancellationToken), creationOptions, InternalTaskOptions.None, TaskScheduler.Default)
{
// Empty
}
public Task(Func<TResult> function, CancellationToken cancellationToken, TaskCreationOptions creationOptions)
: base(function, null, null, cancellationToken, creationOptions, InternalTaskOptions.None, TaskScheduler.Default)
{
// Empty
}
internal Task(Func<TResult> function, CancellationToken cancellationToken, TaskCreationOptions creationOptions, TaskScheduler scheduler)
: base(function, null, null, cancellationToken, creationOptions, InternalTaskOptions.None, scheduler)
{
// Empty
}
internal Task(Func<object, TResult> function, object state, CancellationToken cancellationToken, TaskCreationOptions creationOptions, TaskScheduler scheduler)
: base(function, state, null, cancellationToken, creationOptions, InternalTaskOptions.None, scheduler)
{
// Empty
}
internal Task(Delegate function, object state, Task parent, CancellationToken cancellationToken, TaskCreationOptions creationOptions, InternalTaskOptions internalOptions, TaskScheduler scheduler)
: base(function, state, parent, cancellationToken, creationOptions, internalOptions, scheduler)
{
// Empty
}
public TResult Result
{
get
{
Wait();
if (IsFaulted)
{
throw Exception;
}
if (IsCanceled)
{
throw new AggregateException(new TaskCanceledException(this));
}
return InternalResult;
}
}
internal static Func<Task<Task>, Task<TResult>> ContinuationConvertion { get; private set; }
internal override void InnerInvoke()
{
var action = Action as Func<TResult>;
if (action != null)
{
InternalResult = action();
return;
}
var withState = Action as Func<object, TResult>;
if (withState != null)
{
InternalResult = withState(State);
return;
}
Contract.Assert(false, "Invalid Action in Task");
}
}
}
#endif