resolved warnings and messages, beautified code

MultiTerm.Wpf/Controls/SingleSelectSubMenu.cs

@@ -13,7 +13,7 @@ namespace MultiTerm.Wpf.Controls;
 public class SingleSelectSubMenu : MenuItem
 {
     #region Static Properties
-    public static Dictionary<MenuItem, SingleSelectSubMenu> RegisteredSubItemsAndParent = new Dictionary<MenuItem, SingleSelectSubMenu>();
+    private static readonly Dictionary<MenuItem, SingleSelectSubMenu> RegisteredSubItemsAndParent = new();
     #endregion
 
     #region Dependency Properties
@@ -72,11 +72,9 @@ public class SingleSelectSubMenu : MenuItem
     private static void OnSelectedMenuItemPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
     {
         // extract instance and guard null
-        var sssm = d as SingleSelectSubMenu;
-        if (sssm == null) { return; }
+        if (d is not SingleSelectSubMenu sssm) { return; }
         // extract instance of new Value and guard null
-        var menuItem = e.NewValue as MenuItem;
-        if (menuItem == null) { return; }
+        if (e.NewValue is not MenuItem menuItem) { return; }
 
         // get associated menu items (same group)
         var associatedMenuitems = GetAssociatedMenuItems(sssm);
@@ -100,11 +98,7 @@ public class SingleSelectSubMenu : MenuItem
     private static void OnTitleChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
     {
         // extract instance and guard null
-        var sssm = d as SingleSelectSubMenu;
-        if (sssm == null)
-        {
-            return;
-        }
+        if (d is not SingleSelectSubMenu sssm) { return; }
 
         sssm.Visibility = Visibility.Collapsed;
         sssm.Header = sssm.Title;
@@ -119,11 +113,9 @@ public class SingleSelectSubMenu : MenuItem
     private static void OnOptionsSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
     {
         // extract instance and guard null
-        var sssm = d as SingleSelectSubMenu;
-        if (sssm == null) { return; }
+        if (d is not SingleSelectSubMenu sssm) { return; }
         // extract parent instance of SSSM and guard null
-        var parent = sssm.Parent as MenuItem;
-        if (parent == null) { return; }
+        if (sssm.Parent is not MenuItem parent) { return; }
 
         // IMRPOVEMENT Delete currently associated values (using e.OldValue) from RegisteredSubItemsAndParent
         // create and add title menu item
@@ -159,8 +151,7 @@ public class SingleSelectSubMenu : MenuItem
     private static void OnAnyItemChecked(object sender, RoutedEventArgs e)
     {
         // extract sender menuItem and guard null
-        var menuItem = sender as MenuItem;
-        if (menuItem == null) { return; }
+        if (sender is not MenuItem menuItem) { return; }
 
         // get associated menu items
         var associatedMenuitems = GetAssociatedMenuItems(menuItem);

MultiTerm.Wpf/ValueConverters/EnumDescriptionToMenuItemConverter.cs

@@ -22,7 +22,7 @@ public class EnumDescriptionToMenuItemConverter : IValueConverter
     /// </summary>
     /// <param name="enumObject">Enum Object to get Description of.</param>
     /// <returns>String with Content of DescriptionAttribute of Enum object.</returns>
-    private string GetEnumDescription(Enum enumObject)
+    private static string GetEnumDescription(Enum enumObject)
     {
         // guard argument null
         if(enumObject == null) { throw new ArgumentNullException(nameof(enumObject)); }
@@ -52,7 +52,7 @@ public class EnumDescriptionToMenuItemConverter : IValueConverter
     /// </summary>
     /// <param name="enumObject">An object of the Enum. Will be searched for other Descriptions</param>
     /// <returns>Key Value Pair of Description and respective Enum Value</returns>
-    private Dictionary<string, Enum> GetAllEnumDescriptions(Enum enumObject)
+    private static Dictionary<string, Enum> GetAllEnumDescriptions(Enum enumObject)
     {
         // guard argument null
         if (enumObject == null) { throw new ArgumentNullException(nameof(enumObject)); }
@@ -87,7 +87,7 @@ public class EnumDescriptionToMenuItemConverter : IValueConverter
     public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
     {
         Enum enumValue = (Enum)value;
-        string description = this.GetEnumDescription(enumValue);
+        string description = GetEnumDescription(enumValue);
         MenuItem newMenuItem = new()
         {
             Header = description
@@ -113,8 +113,7 @@ public class EnumDescriptionToMenuItemConverter : IValueConverter
         if (value == null) { throw new ArgumentNullException(nameof(value)); }
 
         // extract menu item and guard null
-        MenuItem? menuObject = value as MenuItem;
-        if (menuObject == null)
+        if (value is not MenuItem menuObject)
         {
             throw new Exception($"Cannot convert value that is not of type {nameof(MenuItem)} with {nameof(EnumDescriptionToMenuItemConverter)}");
         }
@@ -127,7 +126,7 @@ public class EnumDescriptionToMenuItemConverter : IValueConverter
         }
 
         // get all enum descriptions and iterate
-        var descriptionToEnumValue = this.GetAllEnumDescriptions(enumObj);
+        var descriptionToEnumValue = GetAllEnumDescriptions(enumObj);
         foreach (var kvp in descriptionToEnumValue)
         {
             // compare key (enum description) to menu header

MultiTerm.Wpf/View/ShellView.xaml.cs

@@ -1,7 +1,5 @@
-using MultiTerm.Core.Common;
-using MultiTerm.Core.ViewModel;
+using MultiTerm.Core.ViewModel;
 using System;
-using System.Linq;
 using System.Windows.Controls;
 
 namespace MultiTerm.Wpf.View;
@@ -12,21 +10,5 @@ public partial class ShellView : UserControl
     {
         InitializeComponent();
         this.DataContext = App.AppHost!.Services.GetService(typeof(ShellViewModel));
-        this.PopulateSettingsNewlineSelectors();
-    }
-
-    private void PopulateSettingsNewlineSelectors()
-    {
-        //var types = Enum.GetValues(typeof(NewlineSeparatorType)).Cast<NewlineSeparatorType>();
-        //foreach (var newlineSeparatorType in types)
-        //{
-        //    this.newlineReceiveMenuItem.Items.Add(new MenuItem() { Header = newlineSeparatorType });
-        //    this.newlineSendMenuItem.Items.Add(new MenuItem() { Header = newlineSeparatorType });
-        //}
-    }
-
-    private void MenuItem_IsCheckedChanged(object sender, System.Windows.RoutedEventArgs e)
-    {
-        Console.WriteLine("changed");
     }
 }