HttpClient - dealing with aggregate exceptions

Question

Hi i am using HttpClient similar to this:

public static Task AsyncStringRequest(string url, string contentType)
{
    try
    {
        var client          


        

Answer 1

The exception is thrown by task.Result:

var client = new HttpClient();
client.DefaultRequestHeaders.Accept.Add(...);
return client.GetStringAsync(url).ContinueWith(task =>
{
    try
    {
        return task.Result;
    }
    catch (AggregateException ex)
    {
        throw ex;
    }
    catch (WebException ex)
    {
        throw ex;
    }       
    catch (Exception ex)
    {
        throw ex;
    }
});

Better: check if the task faulted before accessing task.Result:

var client = new HttpClient();
client.DefaultRequestHeaders.Accept.Add(...);
return client.GetStringAsync(url).ContinueWith(task =>
{
    if (task.IsFaulted)
    {
        var ex = task.Exception;
    }
    else if (task.IsCancelled)
    {
    }
    else
    {
        return task.Result;
    }
});

If you're not actually doing something in the ContinueWith, you can simply omit it:

var client = new HttpClient();
client.DefaultRequestHeaders.Accept.Add(...);
return client.GetStringAsync(url);