expired token when set to not expire

Hi Greg-DB ,

   Now that I have my hands on an expired token again (and a bit of time) I'm circling back to this issue, as I'm now seeing the same results (and I want to get all my expired access token catching handled before I turn back to the code changes I still need to make for refresh tokens).

   So, as before I'm using GetCurrentAccountAsync to test if the token is valid (since there's no method to check if a token is valid). I have a global exception catcher in the root of the app. I also have the GetCurrentAccountAsync call in a try/catch (and this itself is being called by an AuthoriseAsync method, which is also in a try/catch). Despite all this, the GetCurrentAccountAsync call never returns, never catches an exception, and yet the expired access token exception does indeed show up in my global exception catcher, so I don't know how it's showing up there but not getting caught by any of the local catches (which of course is where you want to deal with it in the first place)?

So here's the relevant lines of code...

// Root of the App
public App() {
AppDomain.CurrentDomain.FirstChanceException+=CurrentDomain_FirstChanceException;
...
private void CurrentDomain_FirstChanceException(object sender,System.Runtime.ExceptionServices.FirstChanceExceptionEventArgs e) {
    Trace.WriteLine($"********************************** UNHANDLED EXCEPTION! Details: {e.Exception}");
    }

// Dropbox class
public async Task AuthoriseAsync(string code="")
{
Trace.Write($"******************* {nameof(AuthoriseAsync)} has started\r\n");
Trace.Write($"******************* DxAccessToken is {DxAccessToken}\r\n");
try {
if (DxAccessToken is string s && s!=string.Empty) {
    await GetAccountNameAsync();
...
catch (Exception ex) {
    Trace.Write($"******************* EXCEPTION! in {nameof(AuthoriseAsync)} {ex.Message}\r\n");
    }

public async Task<string> GetAccountNameAsync(string NameType="")
{
Trace.Write($"******************* {nameof(GetAccountNameAsync)} has started\r\n");
try {
    Trace.Write($"******************* {nameof(GetAccountNameAsync)} is getting account info\r\n");
    Account account=await DxClient.Users.GetCurrentAccountAsync();
    Trace.Write($"******************* DisplayName is {account.Name.DisplayName}\r\n");
...
catch (Exception ex) {
    DxS=$"******************* EXCEPTION! {ex.Message}";
    UserNameText="Not logged in";

And here's the relevant output...

******************* AuthoriseAsync has started
******************* DxAccessToken is sl.BOypWqVzNCIJWfm3j..........
******************* GetAccountNameAsync has started
******************* GetAccountNameAsync is getting account info
********************************** UNHANDLED EXCEPTION! Details: Dropbox.Api.AuthException: expired_access_token/
at Dropbox.Api.DropboxRequestHandler.RequestJsonString(String host, String routeName, String auth, RouteStyle routeStyle, String requestArg, Stream body); Request Id: f9474eb56bf049b7ac81dad99e59ce34
********************************** UNHANDLED EXCEPTION! Details: Dropbox.Api.AuthException: expired_access_token/
at Dropbox.Api.DropboxRequestHandler.RequestJsonString(String host, String routeName, String auth, RouteStyle routeStyle, String requestArg, Stream body)
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw(); Request Id: f9474eb56bf049b7ac81dad99e59ce34
********************************** UNHANDLED EXCEPTION! Details: Dropbox.Api.AuthException: expired_access_token/..
at Dropbox.Api.DropboxRequestHandler.RequestJsonString(String host, String routeName, String auth, RouteStyle routeStyle, String requestArg, Stream body); Request Id: 49117d5a4aea489c8dac85b8fefac953
********************************** UNHANDLED EXCEPTION! Details: Dropbox.Api.AuthException: expired_access_token/..
at Dropbox.Api.DropboxRequestHandler.RequestJsonString(String host, String routeName, String auth, RouteStyle routeStyle, String requestArg, Stream body)
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw(); Request Id: 49117d5a4aea489c8dac85b8fefac953
********************************** UNHANDLED EXCEPTION! Details: Dropbox.Api.AuthException: expired_access_token/..
at Dropbox.Api.DropboxRequestHandler.RequestJsonString(String host, String routeName, String auth, RouteStyle routeStyle, String requestArg, Stream body); Request Id: ad3db026e54c44318576b21a4ad53526
********************************** UNHANDLED EXCEPTION! Details: Dropbox.Api.AuthException: expired_access_token/..
at Dropbox.Api.DropboxRequestHandler.RequestJsonString(String host, String routeName, String auth, RouteStyle routeStyle, String requestArg, Stream body)
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw(); Request Id: ad3db026e54c44318576b21a4ad53526
********************************** UNHANDLED EXCEPTION! Details: Dropbox.Api.AuthException: expired_access_token/..
at Dropbox.Api.DropboxRequestHandler.RequestJsonString(String host, String routeName, String auth, RouteStyle routeStyle, String requestArg, Stream body); Request Id: 5033af5fb84943c6aef843ff3c8a6664
********************************** UNHANDLED EXCEPTION! Details: Dropbox.Api.AuthException: expired_access_token/..
at Dropbox.Api.DropboxRequestHandler.RequestJsonString(String host, String routeName, String auth, RouteStyle routeStyle, String requestArg, Stream body)
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw(); Request Id: 5033af5fb84943c6aef843ff3c8a6664

So none of those catches actually work - as far as I can see the app just gets stuck trying to get the account name with an expired token - and the exception only shows up in the global exception catcher in the root of the app. Do you know what's going on here? Oh also AuthoriseAsync is being called from the Dropbox class constructor (so the user doesn't have to login again if the token is still valid) - might be relevant.

Now that I know how to get the actual expiry-time of the token I can write some code around that, but also I would like to make sure all my exception-catching is working, and it's clearly not when it comes to calling GetCurrentAccountAsync.

thanks,

  Donald.