public static async Task <List <T> > ToList <T>(this IAsyncEnumerator <T> asyncEnumerator)
{
List <T> itemList = new List <T>();
await asyncEnumerator.ForEach(itemList, (item, list) => list.Add(item)).ConfigureAwait(false);
return(itemList);
}
public void ItemExceptionIsPropagated()
{
IAsyncEnumerator <int> enumerator = TaskAsyncEnumerator.Create
(
Task.Delay(100).ContinueWith(_ => 64),
Task.FromException <int>(new InvalidOperationException())
);
Func <Task> act = () => enumerator.ForEach(_ => { });
act.ShouldThrow <InvalidOperationException>();
}
public async Task LambdaIsCalledForEachItem()
{
List <int> callArguments = new List <int>();
Task <int>[] itemTasks = new Task <int>[]
{
Task.FromResult(42),
Task.Delay(100).ContinueWith(_ => 64),
Task.FromResult(128)
};
IAsyncEnumerator <int> enumerator = TaskAsyncEnumerator.Create(itemTasks);
await enumerator.ForEach(item => callArguments.Add(item)).ConfigureAwait(true);
int[] expectedItems = await Task.WhenAll(itemTasks).ConfigureAwait(true);
callArguments.Should().HaveEquivalentItems(expectedItems);
}
public void LambdaExceptionIsPropagated()
{
const int dangerousItem = 42;
IAsyncEnumerator <int> enumerator = TaskAsyncEnumerator.Create
(
Task.Delay(100).ContinueWith(_ => 64),
Task.FromResult(dangerousItem)
);
Func <Task> act
= () =>
enumerator.ForEach
(
value =>
{
if (value == dangerousItem)
{
throw new InvalidOperationException();
}
}
);
act.ShouldThrow <InvalidOperationException>();
}
public static Task ForEach <T>(this IAsyncEnumerator <T> asyncEnumerator, Action <T> action) => asyncEnumerator.ForEach(action, (item, actionArg) => actionArg(item));