Add non-connection failsafe

Added a try/catch as a failsafe for non-operational networks and any other errors involving using Octokit to check for updates on github. Fixes #3.

butterflow-ui/MainWindow.xaml.cs

@@ -53,7 +53,7 @@ namespace butterflow_ui
             InitializeComponent();
 
             // Check for updates.
-            if (OctokitWrapper.CurrentVersionStatus == OctokitWrapper.VersionStatus.behind)
+            if (OctokitWrapper.CurrentVersionStatus == OctokitWrapper.VersionStatus.Behind)
             {
                 var updateMessageBoxResult = MessageBox.Show(string.Format("{0} {1}", Localization.Localization.BehindVersionStatusDescription, Localization.Localization.BehindVersionQuestion), Localization.Localization.UpdateAvailableLabel, MessageBoxButton.YesNo, MessageBoxImage.Information);
 
@@ -64,6 +64,7 @@ namespace butterflow_ui
                     this.Close();
                 }
             }
+
         }
 
         #region Methods

butterflow-ui/OctokitWrapper.cs

@@ -22,7 +22,7 @@ namespace butterflow_ui
         private const string REGEX_VERSION = @"(?<Major>\d+ ?)\.(?<Minor>\d+ ?)\.(?<Patch>\d+ ?)";
 
         /// <summary> The version status of the current installation. </summary>
-        private static VersionStatus versionStatus = VersionStatus.unknown;
+        private static VersionStatus versionStatus = VersionStatus.Unknown;
 
         #endregion
 
@@ -46,13 +46,13 @@ namespace butterflow_ui
             {
                 switch (CurrentVersionStatus)
                 {
-                    case VersionStatus.current:
+                    case VersionStatus.Current:
                         return Localization.Localization.CurrentVersionStatusDescription;
-                    case VersionStatus.behind:
+                    case VersionStatus.Behind:
                         return Localization.Localization.BehindVersionStatusDescription;
-                    case VersionStatus.custom:
+                    case VersionStatus.Custom:
                         return Localization.Localization.CustomVersionStatusDescription;
-                    case VersionStatus.unknown:
+                    case VersionStatus.Unknown:
                     default:
                         return Localization.Localization.UnknownVersionStatusDescription;
                 }
@@ -76,6 +76,8 @@ namespace butterflow_ui
         /// <summary> Gets version status from github. </summary>
         /// <returns> The current version status. </returns>
         private static VersionStatus GetVersionStatus()
+        {
+            try
             {
                 var interpreter = new InputInterpreter();
                 var client = new GitHubClient(new ProductHeaderValue("butterflow-ui"));
@@ -103,18 +105,25 @@ namespace butterflow_ui
 
                     if (latestMajor == currentMajor && latestMinor == currentMinor && latestPatch == currentPatch)
                     {
-                    return VersionStatus.current;
+                        return VersionStatus.Current;
                     }
 
                     if (latestMajor >= currentMajor && latestMinor >= currentMinor && latestPatch >= currentPatch)
                     {
-                    return VersionStatus.behind;
+                        return VersionStatus.Behind;
                     }
 
-                return VersionStatus.custom;
+                    return VersionStatus.Custom;
+                }
+            }
+            catch(Exception e)
+            {
+                //There was an issue connecting to Github. This could be caused by a missing network connection.
+                //We can safely ignore an error in this process and proceed, falling through to the default connection
+                //value of Unknown.
             }
 
-            return VersionStatus.unknown;
+            return VersionStatus.Unknown;
         }
 
         #endregion
@@ -125,13 +134,13 @@ namespace butterflow_ui
         public enum VersionStatus
         {
             /// <summary> The current version is up to date with the github repository. </summary>
-            current,
+            Current,
             /// <summary> The current version is behind the github repository and should be updated. </summary>
-            behind,
+            Behind,
             /// <summary> The current version is ahead of the github repository, or is a custom version of butterflow-ui that cannot be compared to the github repository. </summary>
-            custom,
+            Custom,
             /// <summary> Github failed to respond with the current version. This could be because of rate limits or a network failure. </summary>
-            unknown
+            Unknown
         }
 
         #endregion

butterflow-ui/butterflow-ui.csproj

@@ -48,6 +48,8 @@
     <Reference Include="Octokit, Version=0.31.0.0, Culture=neutral, processorArchitecture=MSIL">
       <HintPath>packages\Octokit.0.31.0\lib\net45\Octokit.dll</HintPath>
     </Reference>
+    <Reference Include="PresentationCore" />
+    <Reference Include="PresentationFramework" />
     <Reference Include="System" />
     <Reference Include="System.Data" />
     <Reference Include="System.Xml" />
@@ -60,8 +62,6 @@
       <RequiredTargetFramework>4.0</RequiredTargetFramework>
     </Reference>
     <Reference Include="WindowsBase" />
-    <Reference Include="PresentationCore" />
-    <Reference Include="PresentationFramework" />
   </ItemGroup>
   <ItemGroup>
     <ApplicationDefinition Include="App.xaml">

butterflow-ui/packages.config

@@ -2,5 +2,4 @@
 <packages>
   <package id="csmic" version="1.1.4" targetFramework="net471" />
   <package id="Gu.Wpf.Media" version="0.5.0.2" targetFramework="net471" />
-  <package id="Octokit" version="0.31.0" targetFramework="net471" />
 </packages>