Add try catch block to address issue #56 (#57)

* Add try catch block to fix issue #56

* Add space for formatting

* Add try catch block to fix issue #56

Author: CodeLover254

Source/VaultSharp.Extensions.Configuration/VaultChangeWatcher.cs

@@ -32,7 +32,7 @@ public VaultChangeWatcher(IConfiguration configuration, ILogger? logger = null)
             }
 
             this._logger = logger;
-            
+
             this._configProviders = configurationRoot.Providers.OfType<VaultConfigurationProvider>().Where(p => p.ConfigurationSource.Options.ReloadOnChange).ToList() !;
         }
 
@@ -54,26 +54,34 @@ protected override async Task ExecuteAsync(CancellationToken stoppingToken)
 
             while (!stoppingToken.IsCancellationRequested)
             {
-                await Task.Delay(TimeSpan.FromSeconds(minTime), stoppingToken).ConfigureAwait(false);
-                if (stoppingToken.IsCancellationRequested)
-                {
-                    break;
-                }
-
-                for (var j = 0; j < this._configProviders.Count(); j++)
+                try
                 {
-                    var timer = timers[j];
-                    timer -= minTime;
-                    if (timer <= 0)
+                    await Task.Delay(TimeSpan.FromSeconds(minTime), stoppingToken).ConfigureAwait(false);
+                    if (stoppingToken.IsCancellationRequested)
                     {
-                        this._configProviders.ElementAt(j).Load();
-                        timers[j] = this._configProviders.ElementAt(j).ConfigurationSource.Options.ReloadCheckIntervalSeconds;
+                        break;
                     }
-                    else
+
+                    for (var j = 0; j < this._configProviders.Count(); j++)
                     {
-                        timers[j] = timer;
+                        var timer = timers[j];
+                        timer -= minTime;
+                        if (timer <= 0)
+                        {
+                            this._configProviders.ElementAt(j).Load();
+                            timers[j] = this._configProviders.ElementAt(j).ConfigurationSource.Options
+                                .ReloadCheckIntervalSeconds;
+                        }
+                        else
+                        {
+                            timers[j] = timer;
+                        }
                     }
                 }
+                catch (Exception ex)
+                {
+                    this._logger?.LogError(ex, $"An exception occurred in {nameof(VaultChangeWatcher)}");
+                }
             }
         }
     }