How to cut exceptions for an array of tasks

Question

I would like to understand how I should use "try" inside my block when trying to find an array of tasks.

I want all the tasks to be expected, despite the fact that one of them threw an exception so that everyone could complete.

Should I use:

var tasks = new Task<CasApiRouterModelExtendedInfo>[mbis.Length];

for (int i = 0; i < mbis.Length; i++)
{
    tasks[i] = CAS.Service.GetAllRouterInterfacesAsync(mbis[i], false, 2);
}

try
{
    Task.WaitAll(tasks);
}
catch (AggregateException ex)
{
    Trace.TraceError("Some interface discoveries failed: ");
    foreach (var innerEx in ex.InnerExceptions)
    {
        Trace.TraceError(innerEx.Message);
    }
}
foreach (var task in tasks)
{
    if (task.Status == TaskStatus.RanToCompletion && task.Result != null)
    {
        returnResults.Add(task.Result);
    }
}

OR

var tasks = new Task<CasApiRouterModelExtendedInfo>[mbis.Length];

for (int i = 0; i < mbis.Length; i++)
{
    tasks[i] = Task.Run(() => CAS.Service.GetAllRouterInterfacesAsync(mbis[i], true, 2));
}

try
{
    for (int i = 0; i < tasks.Length; i++)
    {
        tasks[i].Wait();
    }
}
catch (AggregateException ex)
{
    Trace.TraceError("Some interface discoveries failed: ");
    foreach (var innerEx in ex.InnerExceptions)
    {
        Trace.TraceError(innerEx.Message);
    }
}

foreach (var task in tasks)
{
    if (task.Status == TaskStatus.RanToCompletion && task.Result != null)
    {
        returnResults.Add(task.Result);
    }
}

Also, does this "task.Status == TaskStatus.RanToCompletion" return true if the task did not throw an exception (is this a good way to do this check)?

Answer 1

Is there any reason you would prefer B? I can’t think about it.

B is invalid in case of error.

, . , , , . , , .

, "task.Status == TaskStatus.RanToCompletion" true, ( )?

. , , . , , , .

task.Result != null

, ? task.Result . , GetAllRouterInterfacesAsync null.