Task extended version for catching all exceptions when all starts

TaskExtended.cs

public class TaskExtended
{
    public static async Task<IEnumerable<T>> WhenAll<T>(params Task<T>[] tasks)
    {
        var allTasks = Task.WhenAll(tasks);

        try
        {
            return await allTasks;
        }
        catch (Exception)
        {
            // ignore
        }

        throw allTasks.Exception ?? throw new Exception("This can't possible happen!");
    }
}