public static IAsyncResultEnumerable <TResult, TFailure> SelectMany <TSuccess, TFailure, TBind, TResult>(this IResultEnumerable <TSuccess, TFailure> source, Func <TSuccess, IAsyncEnumerable <TBind> > bind, Func <TSuccess, TBind, Task <TResult> > resultSelector)
{
if (bind == null)
{
throw new ArgumentNullException(nameof(bind));
}
if (resultSelector == null)
{
throw new ArgumentNullException(nameof(resultSelector));
}
return(source
.AsAsyncEnumerable()
.SelectMany(result => result
.Match(success =>
bind
.Invoke(success)
.SelectAsync(obj => resultSelector.Invoke(success, obj))
.Select(Result.Success <TResult, TFailure>),
failure => AsyncEnumerable.Repeat(Result.Failure <TResult, TFailure>(failure), 1)
)
)
.AsAsyncResultEnumerable());
}
public static IAsyncResultEnumerable <TResult, TFailure> SelectMany <TSuccess, TFailure, TBind, TResult>(this IResultEnumerable <TSuccess, TFailure> source, Func <TSuccess, Task <Result <TBind, TFailure> > > bind, Func <TSuccess, TBind, Task <TResult> > resultSelector)
where TSuccess : notnull
where TFailure : notnull
where TBind : notnull
where TResult : notnull
{
if (bind == null)
{
throw new ArgumentNullException(nameof(bind));
}
if (resultSelector == null)
{
throw new ArgumentNullException(nameof(resultSelector));
}
return(source
.AsAsyncEnumerable()
.SelectAsync(result => result
.MatchAsync(success =>
bind
.Invoke(success)
.MapAsync(value => resultSelector.Invoke(success, value)),
failure => Task.FromResult(Result.Failure <TResult, TFailure>(failure))
)
)
.AsAsyncResultEnumerable());
}
