Catch exceptions on history updates

src/BreCalClient/HistoryDialog.xaml.cs

@@ -4,6 +4,8 @@
 
 using BreCalClient.misc.Api;
 using BreCalClient.misc.Model;
+using log4net;
+using log4net.Core;
 using System;
 using System.Collections.Concurrent;
 using System.Collections.Generic;
@@ -22,6 +24,7 @@ namespace BreCalClient
 
         private readonly ConcurrentDictionary<int, ShipcallControlModel> _shipcalls;
         private readonly StaticApi _staticApi;
+        private readonly static ILog _log = LogManager.GetLogger(typeof(HistoryDialog));
 
         #endregion
 
@@ -68,15 +71,18 @@ namespace BreCalClient
         private async void RefreshHistory()
         {
             List<History> allHistories = new();
-            this.stackPanel.Children.Clear();
             
+            try
+            {
                 foreach (int shipcall_id in _shipcalls.Keys)
                 {
                     List<History> shipcallHistory = await _staticApi.HistoryGetAsync(shipcall_id);
                     System.Diagnostics.Trace.WriteLine($"{shipcallHistory.Count} history elements loaded for shipcall {shipcall_id}");
-                allHistories.AddRange( shipcallHistory );
+                    allHistories.AddRange(shipcallHistory);
                 }
 
+                this.stackPanel.Children.Clear();
+
                 // sort all entries
                 allHistories.Sort((x, y) => { return y.Timestamp.CompareTo(x.Timestamp); });
 
@@ -97,7 +103,7 @@ namespace BreCalClient
                         if (_shipcalls[history.ShipcallId].Shipcall != null)
                         {
                             ShipcallType? type = _shipcalls[history.ShipcallId].Shipcall?.Type;
-                        if (type != null) calltype = (string) (enumToStringConverter.Convert(type ?? ShipcallType.Undefined, typeof(ShipcallType), new(), System.Globalization.CultureInfo.CurrentCulture) ?? "");
+                            if (type != null) calltype = (string)(enumToStringConverter.Convert(type ?? ShipcallType.Undefined, typeof(ShipcallType), new(), System.Globalization.CultureInfo.CurrentCulture) ?? "");
                         }
                     }
 
@@ -107,6 +113,14 @@ namespace BreCalClient
                 }
 
                 Mouse.OverrideCursor = null;
+
+            }
+            catch (Exception e)
+            {
+                // Here we rather not show a dialog box since it may confuse the user
+                _log.Error(e.ToString());
+            }
+
         }
 
         bool FilterShipcall(int shipcallId)

src/BreCalClient/MainWindow.xaml.cs

@@ -38,7 +38,7 @@ namespace BreCalClient
 
         #region Fields
 
-        private static Int32 _uiUpdateRunning = 0;
+        private static int _uiUpdateRunning = 0;
         
         private Credentials? _credentials;