WhenAllIgnoreErrors from https://twitter.com/fquednau/status/1220747346973200384

WhenAllIgnoreErrors.cs

public static class TaskExtensions
{

    public static async Task<T[]> WhenAllIgnoreErrors<T>(this Task<T>[] tasks, TimeSpan timeout)
    {
        try
        {
            await Task.WhenAll(tasks).TimeoutAfter(timeout).ConfigureAwait(false);
        }
        catch { /* ignored */ }

        List<T> results = new List<T>();
        foreach (var task in tasks)
        {
            if (task.IsCompletedSuccessfully)
            {
                results.Add(task.Result);
            }
            else
            {
                Ignore(task.Exception);
            }
        }

        return results.ToArray();

        static void Ignore(Exception? ex) { }
    }

    public static async Task<TResult> TimeoutAfter<TResult>(this Task<TResult> task, TimeSpan timeout)
    {
        var cts = new CancellationTokenSource();

        if (task == await Task<TResult>.WhenAny(task, Task<TResult>.Delay(timeout, cts.Token)).ConfigureAwait(false))
        {
            cts.Cancel();
            return await task.ConfigureAwait(false);
        }
        else
        {
            throw new TimeoutException($"Task timed out after {timeout}");
        }
    }
}