public static AwaitAdapter FromAwaitable(object awaitable)
{
if (awaitable == null)
{
throw new InvalidOperationException("A null reference cannot be awaited.");
}
// TaskAwaitAdapter is more efficient because it can rely on Task’s
// special quality of blocking until complete in GetResult.
// As long as the pattern-based adapters are reflection-based, this
// is much more efficient as well.
var task = awaitable as System.Threading.Tasks.Task;
if (task != null)
{
return(TaskAwaitAdapter.Create(task));
}
// Await all the (C# and F#) things
var adapter =
CSharpPatternBasedAwaitAdapter.TryCreate(awaitable)
?? FSharpAsyncAwaitAdapter.TryCreate(awaitable);
if (adapter != null)
{
return(adapter);
}
throw new NotSupportedException("NUnit can only await objects which follow the C# specification for awaitable expressions.");
}
public static AwaitAdapter FromAwaitable(object awaitable)
{
if (awaitable == null)
{
throw new InvalidOperationException("A null reference cannot be awaited.");
}
#if !(NET35 || NET40)
// TaskAwaitAdapter is more efficient because it can rely on Task’s
// special quality of blocking until complete in GetResult.
// As long as the pattern-based adapters are reflection-based, this
// is much more efficient as well.
var task = awaitable as System.Threading.Tasks.Task;
if (task != null)
{
return(TaskAwaitAdapter.Create(task));
}
#endif
// Await all the (C# and F#) things
var adapter =
CSharpPatternBasedAwaitAdapter.TryCreate(awaitable)
?? FSharpAsyncAwaitAdapter.TryCreate(awaitable);
if (adapter != null)
{
return(adapter);
}
#if NET40
// If System.Threading.Tasks.Task does not have a GetAwaiter instance method
// (we don’t heuristically search for AsyncBridge-style extension methods),
// we still need to be able to await it to preserve NUnit behavior on machines
// which have a max .NET Framework version of 4.0 installed, such as the default
// for versions of Windows earlier than 8.
var task = awaitable as System.Threading.Tasks.Task;
if (task != null)
{
return(Net40BclTaskAwaitAdapter.Create(task));
}
#endif
throw new NotSupportedException("NUnit can only await objects which follow the C# specification for awaitable expressions.");
}