public static Task <ResultEx <TResult> > ThenAsync <TValue, TResult>(this ResultEx <TValue> result, Func <TValue, Task <TResult> > func)
{
return(result.IsError
? Task.FromResult(ResultEx <TResult> .FromError(result.Error))
: func(result.Value).ContinueWith(task => ResultEx <TResult> .FromValue(task.Result), CancellationToken.None,
TaskContinuationOptions.DenyChildAttach | TaskContinuationOptions.ExecuteSynchronously, TaskScheduler.Default));
}
public static Task <ResultEx <T> > Where <T>(this Task <ResultEx <T> > resultTask, Func <T, bool> predicate,
Func <T, string> errorMessageFunc, TaskScheduler scheduler = null)
{
return(resultTask.ContinueWith((task, f) =>
{
var result = task.Result;
return result.IsError ? ResultEx <T> .FromError(result.Error) : result.Where((Func <T, bool>)f, errorMessageFunc);
}, predicate, CancellationToken.None, TaskContinuationOptions.DenyChildAttach, scheduler ?? TaskScheduler.Default));
}
public static Task <ResultEx <TResult> > ThenAsync <TValue, TResult>(this Task <ResultEx <TValue> > resultTask,
Func <TValue, Task <ResultEx <TResult> > > func, TaskScheduler scheduler = null)
{
return(resultTask.ContinueWith((task, f) =>
{
return task.Result.IsError
? Task.FromResult(ResultEx <TResult> .FromError(task.Result.Error))
: ((Func <TValue, Task <ResultEx <TResult> > >)f)(task.Result.Value)
.ContinueWith(t => t.Result, TaskContinuationOptions.ExecuteSynchronously);
}, func,
CancellationToken.None, TaskContinuationOptions.DenyChildAttach,
scheduler ?? TaskScheduler.Default).Unwrap());
}
public static Task <ResultEx <TResult> > ThenTryAsync <TValue, TResult>(this Result <TValue> result,
Func <TValue, Task <Result <TResult> > > func)
{
if (result.IsError)
{
return(Task.FromResult(ResultEx <TResult> .FromError(new ResultErrorException(result.Error))));
}
try
{
return(func(result.Value).ContinueWith(task => task.Result.ToResultEx(),
TaskContinuationOptions.DenyChildAttach | TaskContinuationOptions.ExecuteSynchronously));
}
catch (Exception e)
{
return(Task.FromResult(ResultEx <TResult> .FromError(e)));
}
}
public static Task <ResultEx <TResult> > ThenTryAsync <TValue, TResult>(this Result <TValue> result, Func <TValue, Task <TResult> > func)
{
if (result.IsError)
{
return(Task.FromResult(ResultEx <TResult> .FromError(new ResultErrorException(result.Error))));
}
try
{
return(func(result.Value)
.ContinueWith(task => task.IsFaulted
? ResultEx <TResult> .FromError(task.Exception.TryFlattenAggregateException())
: ResultEx <TResult> .FromValue(
task.Result), CancellationToken.None,
TaskContinuationOptions.DenyChildAttach | TaskContinuationOptions.ExecuteSynchronously, TaskScheduler.Default));
}
catch (Exception e)
{
var exception = (e as AggregateException)?.GetBaseException() ?? e;
return(Task.FromResult(ResultEx <TResult> .FromError(exception)));
}
}
public static Task <ResultEx <TResult> > ThenTryAsync <TValue, TResult>(this Task <Result <TValue> > resultTask,
Func <TValue, Task <TResult> > func, TaskScheduler scheduler = null)
{
return(resultTask.ContinueWith((task, f) =>
{
var result = task.Result;
if (result.IsError)
{
return Task.FromResult(ResultEx <TResult> .FromError(new ResultErrorException(result.Error)));
}
try
{
return ((Func <TValue, Task <TResult> >)f)(task.Result.Value)
.ContinueWith(t => ResultEx.FromValue(t.Result), TaskContinuationOptions.ExecuteSynchronously);
}
catch (Exception e)
{
return Task.FromResult(ResultEx <TResult> .FromError(e));
}
}, func, CancellationToken.None, TaskContinuationOptions.DenyChildAttach,
scheduler ?? TaskScheduler.Default).Unwrap());
}
public static Task <ResultEx <TResult> > ThenAsync <TValue, TResult>(this ResultEx <TValue> result, Func <TValue, Task <ResultEx <TResult> > > func)
{
return(result.IsError
? Task.FromResult(ResultEx <TResult> .FromError(result.Error))
: func(result.Value));
}