[projects] Adding info message for cases: there are no projects or no results for the search

src/modules/Projects/ProjectsEditor/Converters/BooleanToInvertedVisibilityConverter.cs

@@ -0,0 +1,29 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Globalization;
+using System.Windows;
+using System.Windows.Data;
+
+namespace ProjectsEditor.Converters
+{
+    public class BooleanToInvertedVisibilityConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if ((bool)value)
+            {
+                return Visibility.Collapsed;
+            }
+
+            return Visibility.Visible;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}

src/modules/Projects/ProjectsEditor/MainPage.xaml

@@ -5,11 +5,14 @@
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
     xmlns:props="clr-namespace:ProjectsEditor.Properties"
+    xmlns:converters="clr-namespace:ProjectsEditor.Converters"
     xmlns:local="clr-namespace:ProjectsEditor"
     mc:Ignorable="d" 
     d:DesignHeight="450" d:DesignWidth="800"
     Title="MainPage">
     <Page.Resources>
+        <BooleanToVisibilityConverter x:Key="BoolToVis" />
+        <converters:BooleanToInvertedVisibilityConverter x:Key="BooleanToInvertedVisibilityConverter" />
         <Thickness x:Key="ContentDialogPadding">24,16,0,24</Thickness>
         <Thickness x:Key="ContentDialogCommandSpaceMargin">0,24,24,0</Thickness>
         <Style x:Key="DeleteButtonStyle" TargetType="Button">
@@ -149,12 +152,19 @@
                 <ComboBoxItem Content="{x:Static props:Resources.Name}" />
             </ComboBox>
         </StackPanel>
-        
+        <TextBlock
+            Grid.Row="2"
+            Text="{Binding EmptyProjectsViewMessage, UpdateSourceTrigger=PropertyChanged}"
+            FontSize="20"
+            Foreground="{DynamicResource PrimaryForegroundBrush}"
+            Margin="40,40,40,40"
+            Visibility="{Binding IsProjectsViewEmpty, Mode=OneWay, Converter={StaticResource BoolToVis}, UpdateSourceTrigger=PropertyChanged}"/>
         <ScrollViewer
             VerticalContentAlignment="Stretch"
             VerticalScrollBarVisibility="Auto"
             Grid.Row="2"
-            Margin="40,15,40,40">
+            Margin="40,15,40,40"
+            Visibility="{Binding IsProjectsViewEmpty, Mode=OneWay, Converter={StaticResource BooleanToInvertedVisibilityConverter}, UpdateSourceTrigger=PropertyChanged}">
             <ItemsControl ItemsSource="{Binding ProjectsView, Mode=OneWay, UpdateSourceTrigger=PropertyChanged}">
                 <ItemsControl.ItemsPanel>
                     <ItemsPanelTemplate>

src/modules/Projects/ProjectsEditor/Properties/Resources.Designer.cs

@@ -303,6 +303,15 @@ namespace ProjectsEditor.Properties {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to No projects match the current search..
+        /// </summary>
+        public static string NoProjectsMatch {
+            get {
+                return ResourceManager.GetString("NoProjectsMatch", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to The application cannot be found.
         /// </summary>

src/modules/Projects/ProjectsEditor/Properties/Resources.resx

@@ -195,6 +195,9 @@
   <data name="New_project" xml:space="preserve">
     <value>New project</value>
   </data>
+  <data name="NoProjectsMatch" xml:space="preserve">
+    <value>No projects match the current search.</value>
+  </data>
   <data name="NotFoundTooltip" xml:space="preserve">
     <value>The application cannot be found</value>
   </data>

src/modules/Projects/ProjectsEditor/ViewModels/MainViewModel.cs

@@ -30,8 +30,21 @@ namespace ProjectsEditor.ViewModels
             get
             {
                 IEnumerable<Project> projects = GetFilteredProjects();
-                if (projects == null)
+                IsProjectsViewEmpty = !(projects != null && projects.Any());
+                OnPropertyChanged(new PropertyChangedEventArgs(nameof(IsProjectsViewEmpty)));
+                if (IsProjectsViewEmpty)
                 {
+                    if (Projects != null && Projects.Any())
+                    {
+                        EmptyProjectsViewMessage = Properties.Resources.NoProjectsMatch;
+                    }
+                    else
+                    {
+                        EmptyProjectsViewMessage = Properties.Resources.No_Projects_Message;
+                    }
+
+                    OnPropertyChanged(new PropertyChangedEventArgs(nameof(EmptyProjectsViewMessage)));
+
                     return Enumerable.Empty<Project>();
                 }
 
@@ -51,6 +64,10 @@ namespace ProjectsEditor.ViewModels
             }
         }
 
+        public bool IsProjectsViewEmpty { get; set; }
+
+        public string EmptyProjectsViewMessage { get; set; }
+
         // return those projects where the project name or any of the selected apps' name contains the search term
         private IEnumerable<Project> GetFilteredProjects()
         {