How to check if ESRI server is accessible ?

Question

Hello,

I am using Esri.ArcGISRuntime 100.14.0 and I wanted to know, before I can display the map to my users, if your servers are accessible or not.

The idea is that if the users don't have internet access, are located in an area where access is filtered or the ESRI servers are inaccessible, I don't want to display access to the map and indicate an error message, rather than risk causing an exception (and I don't want to handle everything in a try/catch).

Is this possible?

Sincerely

JoeHershman · Accepted Answer

Just use HttpClient to make a call to the endpoint and see if you get a response or a timeout before trying to load the map. This uses the generic sharing Url, but could use the Url of the basemap itself public override async Task CheckIsConnectedAsync() { try { var tokenUri = new Uri($"{ConnectionUrl}/sharing/rest?f=json"); HttpClient client = new HttpClient { Timeout = TimeSpan.FromSeconds(7) }; var result = await client.GetStringAsync(tokenUri); var jsonObject = JsonConvert.DeserializeObject>(result); return jsonObject.ContainsKey("currentVersion"); } catch ( TaskCanceledException ) { //timeout - server down return false; } catch ( Exception ) { //Can connect but server not fully up and running return false; } } If you are using Xamarin the Essentials library has methods to check general device connectivity as a way to look at that.

SomeGISGuy · Accepted Answer

You could just try and load the map and layers. This will load their metadata - if that fails, the service is most likely down.

try
            {
                await _map.LoadAsync();
                await Task.WhenAll(_map.AllLayers.Select(l => l.LoadAsync()));
            }
            catch (Exception ex)
            {
                // Can't load
            }