public static async Tasks.Task <T> First <T>(this IAsyncEnumerator <T> me)
{
T result;
if (me.NotNull())
{
result = await me.MoveNext() ? me.Current : default(T);
(me as IDisposable)?.Dispose();
}
else
{
result = default(T);
}
return(result);
}
public static Tasks.Task <T[]> ToArray <T>(this IAsyncEnumerator <T> me)
{
async Tasks.Task <T[]> toArray(int count)
{
T[] result;
if (await me.MoveNext())
{
var head = me.Current;
result = await toArray(count + 1);
result[count] = head;
}
else
{
result = new T[count];
}
return(result);
}
return(me.NotNull() ? toArray(0) : null);
}
public static async Tasks.Task <T> Next <T>(this IAsyncEnumerator <T> me, T @default = default(T))
{
return(me.NotNull() && await me.MoveNext() ? me.Current : @default);
}