Added more error messages

Author: ScottIsAFool

LiveWriterPluginManager/App.xaml.cs

@@ -22,21 +22,6 @@ private void OnStartup(object sender, StartupEventArgs e)
             {
                 AppHelper.CreatePluginDirectory();
             }
-            else
-            {
-                // TODO: Display some kind of message prompt
-            }
-
-            AppDomain myDomain = Thread.GetDomain();
-
-            myDomain.SetPrincipalPolicy(PrincipalPolicy.WindowsPrincipal);
-            WindowsPrincipal myPrincipal = (WindowsPrincipal)Thread.CurrentPrincipal;
-            if (!myPrincipal.IsInRole(WindowsBuiltInRole.Administrator))
-            {
-                // TODO: Show a message that it's not in administrator
-                MessageBox.Show("Not running as adming");
-                var i = 0;
-            }
         }
     }
 }

LiveWriterPluginManager/Controls/RemovePluginControl.xaml

@@ -43,7 +43,8 @@
                             Style="{StaticResource MaterialDesignFloatingActionMiniAccentButton}"
                             Height="30"
                             Width="30"
-                            Command="{Binding DeletePluginCommand}">
+                            Command="{Binding DeletePluginCommand}"
+                            IsEnabled="{Binding CanRemove}">
                         <Viewbox Stretch="Uniform"
                                  StretchDirection="DownOnly"
                                  Width="20"

LiveWriterPluginManager/Helpers/AppHelper.cs

@@ -2,6 +2,8 @@
 using System.Diagnostics;
 using System.IO;
 using System.Linq;
+using System.Security.Principal;
+using System.Threading;
 
 namespace LiveWriterPluginManager.Helpers
 {
@@ -41,5 +43,14 @@ public static bool IsLiveWriterRunning()
             var process = Process.GetProcessesByName("OpenLiveWriter");
             return process.Any();
         }
+
+        public static bool IsRunningAsAdmin()
+        {
+            var myDomain = Thread.GetDomain();
+
+            myDomain.SetPrincipalPolicy(PrincipalPolicy.WindowsPrincipal);
+            var myPrincipal = (WindowsPrincipal)Thread.CurrentPrincipal;
+            return myPrincipal.IsInRole(WindowsBuiltInRole.Administrator);
+        }
     }
 }

LiveWriterPluginManager/MainWindow.xaml

@@ -7,6 +7,8 @@
                       xmlns:dragablz="http://dragablz.net/winfx/xaml/dragablz"
                       xmlns:local="clr-namespace:LiveWriterPluginManager.Controls"
                       xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
+                      xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
+                      xmlns:command="http://www.galasoft.ch/mvvmlight"
                       mc:Ignorable="d"
                       Title="Live Writer Plugin Manager"
                       Height="350"
@@ -19,6 +21,11 @@
                       Background="{DynamicResource MaterialDesignPaper}"
                       FontFamily="pack://application:,,,/MaterialDesignThemes.Wpf;component/Resources/Roboto/#Roboto"
                       DataContext="{Binding Main, Source={StaticResource Locator}}">
+    <i:Interaction.Triggers>
+        <i:EventTrigger EventName="Loaded">
+            <command:EventToCommand Command="{Binding LoadedCommand}" />
+        </i:EventTrigger>
+    </i:Interaction.Triggers>
     <materialDesign:DialogHost>
         <Grid>
             <dragablz:TabablzControl TextElement.Foreground="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType=Window}, Path=(TextElement.Foreground)}"

LiveWriterPluginManager/ViewModel/AddPluginViewModel.cs

@@ -31,7 +31,7 @@ public AddPluginViewModel(IZipService zipService, IFileService fileService, ILiv
             _zipService = zipService;
             _fileService = fileService;
             _liveWriterService = liveWriterService;
-            CanAdd = AppHelper.LiveWriterInstalled;
+            CanAdd = AppHelper.LiveWriterInstalled && AppHelper.IsRunningAsAdmin();
         }
 
         public bool CanAdd { get; set; }

LiveWriterPluginManager/ViewModel/MainViewModel.cs

@@ -1,8 +1,39 @@
-using GalaSoft.MvvmLight;
+using System.Net.Mime;
+using System.Windows;
+using GalaSoft.MvvmLight;
+using GalaSoft.MvvmLight.Command;
+using LiveWriterPluginManager.Helpers;
+using LiveWriterPluginManager.Services;
 
 namespace LiveWriterPluginManager.ViewModel
 {
     public class MainViewModel : ViewModelBase
     {
+        private readonly IMessageService _messageService;
+        public MainViewModel(IMessageService messageService)
+        {
+            _messageService = messageService;
+        }
+
+        public RelayCommand LoadedCommand
+        {
+            get
+            {
+                return new RelayCommand(() =>
+                {
+                    if (!AppHelper.LiveWriterInstalled)
+                    {
+                        _messageService.ShowErrorAsync("It doesn't look like you have Live Writer installed, please go to http://openlivewriter.org to download and install it.");
+                        Application.Current.Shutdown();
+                        return;
+                    }
+
+                    if (!AppHelper.IsRunningAsAdmin())
+                    {
+                        _messageService.ShowErrorAsync("In order for this app to add/remove plugins, it needs to run as Administrator, please restart the app with higher privileges");
+                    }
+                });
+            }
+        }
     }
 }

LiveWriterPluginManager/ViewModel/PluginViewModel.cs

@@ -20,6 +20,8 @@ public PluginViewModel(Plugin plugin, ILiveWriterService liveWriterService, IMes
 
         public Plugin Plugin { get; set; }
 
+        public bool CanRemove => AppHelper.IsRunningAsAdmin();
+
         public RelayCommand DeletePluginCommand
         {
             get