public static Task <ResultGeneric <TResult, TError> > ThenAsync <TValue, TError, TResult>(this ResultGeneric <TValue, TError> result, Func <TValue, Task <TResult> > func)
{
return(result.IsError
? Task.FromResult(ResultGeneric <TResult, TError> .FromError(result.Error))
: func(result.Value).ContinueWith(task => ResultGeneric <TResult, TError> .FromValue(task.Result), CancellationToken.None,
TaskContinuationOptions.DenyChildAttach | TaskContinuationOptions.ExecuteSynchronously, TaskScheduler.Default));
}
public static Task <ResultGeneric <TResult, TError> > ThenAsync <TValue, TError, TResult>(this Task <ResultGeneric <TValue, TError> > resultTask,
Func <TValue, Task <TResult> > func, TaskScheduler scheduler = null)
{
return(resultTask.ContinueWith((task, f) =>
{
return task.Result.IsError
? Task.FromResult(ResultGeneric <TResult, TError> .FromError(task.Result.Error))
: ((Func <TValue, Task <TResult> >)f)(task.Result.Value)
.ContinueWith(t => ResultGeneric <TResult, TError> .FromValue(t.Result), TaskContinuationOptions.ExecuteSynchronously);
}, func,
CancellationToken.None, TaskContinuationOptions.DenyChildAttach,
scheduler ?? TaskScheduler.Default).Unwrap());
}
public static Task <ResultGeneric <TResult, TError> > ThenTryAsync <TValue, TError, TResult>(this ResultGeneric <TValue, TError> result, Func <TValue, Task <TResult> > func,
Func <Exception, TError> catchFunc)
{
if (result.IsError)
{
return(Task.FromResult(ResultGeneric <TResult, TError> .FromError(result.Error)));
}
try
{
return(func(result.Value).ContinueWith(task => task.IsFaulted
? ResultGeneric <TResult, TError> .FromError(catchFunc(task.Exception.TryFlattenAggregateException()))
: ResultGeneric <TResult, TError> .FromValue(task.Result), CancellationToken.None,
TaskContinuationOptions.DenyChildAttach | TaskContinuationOptions.ExecuteSynchronously, TaskScheduler.Default));
}
catch (Exception e)
{
return(Task.FromResult(ResultGeneric <TResult, TError> .FromError(catchFunc(e))));
}
}
