Move Settings to ILSpyX (#2869)

* Move ILSpySettings to ILSpyX
* Make settings file path configurable using a static provider interface
* Move MiscSettings to ILSpyX, rename existing to MiscSettingsVieModel
* Introduce static Load for DecompilerSettings on interface
* Add path provider for ilspycmd parameter scenario
* Allow for saving of MiscSettingsPanel
* Rename DisplaySettings to DisplaySettingsViewModel
* Add SaveDecompilerSettings

ICSharpCode.ILSpyX/AssemblyListManager.cs

@@ -23,17 +23,10 @@ using System.Linq;
 using System.Xml.Linq;
 
 using ICSharpCode.Decompiler.Metadata;
+using ICSharpCode.ILSpyX.Settings;
 
 namespace ICSharpCode.ILSpyX
 {
-	public interface ISettingsProvider
-	{
-		XElement this[XName section] { get; }
-
-		void Update(Action<XElement> action);
-		ISettingsProvider Load();
-	}
-
 	/// <summary>
 	/// Manages the available assembly lists.
 	/// 

ICSharpCode.ILSpyX/Settings/DefaultSettingsFilePathProvider.cs

@@ -0,0 +1,40 @@
+// Copyright (c) 2022 AlphaSierraPapa for the SharpDevelop Team
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a copy of this
+// software and associated documentation files (the "Software"), to deal in the Software
+// without restriction, including without limitation the rights to use, copy, modify, merge,
+// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
+// to whom the Software is furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in all copies or
+// substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
+// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+using System;
+
+namespace ICSharpCode.ILSpyX.Settings
+{
+	/// <summary>
+	/// Used in scenarios where the user passes a path and that is to be used, eg ilspycmd parameter
+	/// </summary>
+	public class DefaultSettingsFilePathProvider : ISettingsFilePathProvider
+	{
+		private readonly string _providedPath;
+
+		public DefaultSettingsFilePathProvider(string providedPath)
+		{
+			_providedPath = providedPath;
+		}
+
+		public string GetSettingsFilePath()
+		{
+			return _providedPath;
+		}
+	}
+}

ICSharpCode.ILSpyX/Settings/ILSpySettings.cs

@@ -22,15 +22,18 @@ using System.Threading;
 using System.Xml;
 using System.Xml.Linq;
 
-using ICSharpCode.ILSpyX;
-
-namespace ICSharpCode.ILSpy
+namespace ICSharpCode.ILSpyX.Settings
 {
 	/// <summary>
 	/// Manages IL Spy settings.
 	/// </summary>
 	public class ILSpySettings : ISettingsProvider
 	{
+		/// <summary>
+		/// This settings file path provider determines where to load settings file from, includes filename
+		/// </summary>
+		public static ISettingsFilePathProvider? SettingsFilePathProvider { get; set; }
+
 		readonly XElement root;
 
 		ILSpySettings()
@@ -62,6 +65,11 @@ namespace ICSharpCode.ILSpy
 				try
 				{
 					XDocument doc = LoadWithoutCheckingCharacters(GetConfigFile());
+					if (null == doc.Root)
+					{
+						return new ILSpySettings();
+					}
+
 					return new ILSpySettings(doc.Root);
 				}
 				catch (IOException)
@@ -87,7 +95,7 @@ namespace ICSharpCode.ILSpy
 		{
 			Update(
 				delegate (XElement root) {
-					XElement existingElement = root.Element(section.Name);
+					XElement? existingElement = root.Element(section.Name);
 					if (existingElement != null)
 						existingElement.ReplaceWith(section);
 					else
@@ -113,14 +121,14 @@ namespace ICSharpCode.ILSpy
 				catch (IOException)
 				{
 					// ensure the directory exists
-					Directory.CreateDirectory(Path.GetDirectoryName(config));
+					Directory.CreateDirectory(Path.GetDirectoryName(config)!);
 					doc = new XDocument(new XElement("ILSpy"));
 				}
 				catch (XmlException)
 				{
 					doc = new XDocument(new XElement("ILSpy"));
 				}
-				doc.Root.SetAttributeValue("version", DecompilerVersionInfo.Major + "." + DecompilerVersionInfo.Minor + "." + DecompilerVersionInfo.Build + "." + DecompilerVersionInfo.Revision);
+				doc.Root!.SetAttributeValue("version", DecompilerVersionInfo.Major + "." + DecompilerVersionInfo.Minor + "." + DecompilerVersionInfo.Build + "." + DecompilerVersionInfo.Revision);
 				action(doc.Root);
 				doc.Save(config, SaveOptions.None);
 			}
@@ -133,12 +141,11 @@ namespace ICSharpCode.ILSpy
 
 		static string GetConfigFile()
 		{
-			if (App.CommandLineArguments.ConfigFile != null)
-				return App.CommandLineArguments.ConfigFile;
-			string localPath = Path.Combine(Path.GetDirectoryName(typeof(MainWindow).Assembly.Location), "ILSpy.xml");
-			if (File.Exists(localPath))
-				return localPath;
-			return Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "ICSharpCode\\ILSpy.xml");
+			if (null != SettingsFilePathProvider)
+				return SettingsFilePathProvider.GetSettingsFilePath();
+
+			throw new ArgumentNullException(nameof(SettingsFilePathProvider));
+			// return "ILSpy.xml";
 		}
 
 		ISettingsProvider ISettingsProvider.Load()

ICSharpCode.ILSpyX/Settings/IMiscSettings.cs

@@ -0,0 +1,42 @@
+// Copyright (c) 2022 AlphaSierraPapa for the SharpDevelop Team
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a copy of this
+// software and associated documentation files (the "Software"), to deal in the Software
+// without restriction, including without limitation the rights to use, copy, modify, merge,
+// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
+// to whom the Software is furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in all copies or
+// substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
+// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+using System;
+using System.Xml.Linq;
+
+namespace ICSharpCode.ILSpyX.Settings
+{
+	public interface IMiscSettings
+	{
+		public bool AllowMultipleInstances { get; set; }
+		public bool LoadPreviousAssemblies { get; set; }
+
+		public static void Save(XElement root, IMiscSettings miscSettings)
+		{
+			var section = new XElement("MiscSettings");
+			section.SetAttributeValue(nameof(miscSettings.AllowMultipleInstances), miscSettings.AllowMultipleInstances);
+			section.SetAttributeValue(nameof(miscSettings.LoadPreviousAssemblies), miscSettings.LoadPreviousAssemblies);
+
+			XElement? existingElement = root.Element("MiscSettings");
+			if (existingElement != null)
+				existingElement.ReplaceWith(section);
+			else
+				root.Add(section);
+		}
+	}
+}

ICSharpCode.ILSpyX/Settings/ISettingsFilePathProvider.cs

@@ -0,0 +1,27 @@
+// Copyright (c) 2022 AlphaSierraPapa for the SharpDevelop Team
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a copy of this
+// software and associated documentation files (the "Software"), to deal in the Software
+// without restriction, including without limitation the rights to use, copy, modify, merge,
+// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
+// to whom the Software is furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in all copies or
+// substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
+// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+using System;
+
+namespace ICSharpCode.ILSpyX.Settings
+{
+	public interface ISettingsFilePathProvider
+	{
+		string GetSettingsFilePath();
+	}
+}

ICSharpCode.ILSpyX/Settings/ISettingsProvider.cs

@@ -0,0 +1,69 @@
+// Copyright (c) 2011 AlphaSierraPapa for the SharpDevelop Team
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a copy of this
+// software and associated documentation files (the "Software"), to deal in the Software
+// without restriction, including without limitation the rights to use, copy, modify, merge,
+// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
+// to whom the Software is furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in all copies or
+// substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
+// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+using System;
+using System.ComponentModel;
+using System.Linq;
+using System.Reflection;
+using System.Xml.Linq;
+
+using static System.Collections.Specialized.BitVector32;
+
+namespace ICSharpCode.ILSpyX.Settings
+{
+	public interface ISettingsProvider
+	{
+		XElement this[XName section] { get; }
+
+		void Update(Action<XElement> action);
+		ISettingsProvider Load();
+
+		public static ICSharpCode.Decompiler.DecompilerSettings LoadDecompilerSettings(ISettingsProvider settingsProvider)
+		{
+			XElement e = settingsProvider["DecompilerSettings"];
+			var newSettings = new Decompiler.DecompilerSettings();
+			var properties = typeof(Decompiler.DecompilerSettings).GetProperties()
+				.Where(p => p.GetCustomAttribute<BrowsableAttribute>()?.Browsable != false);
+			foreach (var p in properties)
+			{
+				var value = (bool?)e.Attribute(p.Name);
+				if (value.HasValue)
+					p.SetValue(newSettings, value.Value);
+			}
+			return newSettings;
+		}
+
+		public static void SaveDecompilerSettings(XElement root, ICSharpCode.Decompiler.DecompilerSettings newSettings)
+		{
+			var properties = typeof(Decompiler.DecompilerSettings).GetProperties()
+				.Where(p => p.GetCustomAttribute<BrowsableAttribute>()?.Browsable != false);
+
+			XElement section = new XElement("DecompilerSettings");
+			foreach (var p in properties)
+			{
+				section.SetAttributeValue(p.Name, p.GetValue(newSettings));
+			}
+
+			XElement? existingElement = root.Element("DecompilerSettings");
+			if (existingElement != null)
+				existingElement.ReplaceWith(section);
+			else
+				root.Add(section);
+		}
+	}
+}

ICSharpCode.ILSpyX/Settings/ISettingsSection.cs

@@ -0,0 +1,32 @@
+// Copyright (c) 2022 AlphaSierraPapa for the SharpDevelop Team
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a copy of this
+// software and associated documentation files (the "Software"), to deal in the Software
+// without restriction, including without limitation the rights to use, copy, modify, merge,
+// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
+// to whom the Software is furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in all copies or
+// substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
+// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+using System;
+
+namespace ICSharpCode.ILSpyX.Settings
+{
+	public interface ISettingsSection<TSelf>
+	{
+		// This should be abstract, but that needs C# 11.0 (see IParseable<TSelf>)
+		// Keep it to be enabled in the future
+		public static TSelf Load(ISettingsProvider settingsProvider)
+		{
+			throw new NotImplementedException();
+		}
+	}
+}

ICSharpCode.ILSpyX/Settings/MiscSettings.cs

@@ -0,0 +1,43 @@
+// Copyright (c) 2022 AlphaSierraPapa for the SharpDevelop Team
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a copy of this
+// software and associated documentation files (the "Software"), to deal in the Software
+// without restriction, including without limitation the rights to use, copy, modify, merge,
+// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
+// to whom the Software is furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in all copies or
+// substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
+// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+using System;
+using System.Xml.Linq;
+
+namespace ICSharpCode.ILSpyX.Settings
+{
+	public class MiscSettings : IMiscSettings, ISettingsSection<MiscSettings>
+	{
+		private MiscSettings()
+		{
+		}
+
+		public bool AllowMultipleInstances { get; set; }
+		public bool LoadPreviousAssemblies { get; set; }
+
+		public static MiscSettings Load(ISettingsProvider settingsProvider)
+		{
+			XElement e = settingsProvider["MiscSettings"];
+			var s = new MiscSettings();
+			s.AllowMultipleInstances = (bool?)e.Attribute(nameof(s.AllowMultipleInstances)) ?? false;
+			s.LoadPreviousAssemblies = (bool?)e.Attribute(nameof(s.LoadPreviousAssemblies)) ?? true;
+
+			return s;
+		}
+	}
+}

ILSpy.ReadyToRun/ReadyToRunOptionPage.xaml.cs

@@ -21,6 +21,7 @@ using System.Windows.Controls;
 using System.Xml.Linq;
 
 using ICSharpCode.ILSpy.Options;
+using ICSharpCode.ILSpyX.Settings;
 
 namespace ICSharpCode.ILSpy.ReadyToRun
 {

ILSpy.ReadyToRun/ReadyToRunOptions.cs

@@ -19,6 +19,7 @@
 using System.Xml.Linq;
 
 using ICSharpCode.ILSpyX;
+using ICSharpCode.ILSpyX.Settings;
 
 namespace ICSharpCode.ILSpy.ReadyToRun
 {

ILSpy/AboutPage.cs

@@ -35,6 +35,7 @@ using ICSharpCode.Decompiler;
 using ICSharpCode.ILSpy.Properties;
 using ICSharpCode.ILSpy.TextView;
 using ICSharpCode.ILSpy.Themes;
+using ICSharpCode.ILSpyX.Settings;
 
 namespace ICSharpCode.ILSpy
 {

ILSpy/App.xaml.cs

@@ -32,6 +32,7 @@ using System.Windows.Navigation;
 using System.Windows.Threading;
 
 using ICSharpCode.ILSpy.Options;
+using ICSharpCode.ILSpyX.Settings;
 
 using Microsoft.VisualStudio.Composition;
 
@@ -59,6 +60,8 @@ namespace ICSharpCode.ILSpy
 
 		public App()
 		{
+			ILSpySettings.SettingsFilePathProvider = new ILSpySettingsFilePathProvider();
+
 			var cmdArgs = Environment.GetCommandLineArgs().Skip(1);
 			App.CommandLineArguments = new CommandLineArguments(cmdArgs);
 			bool forceSingleInstance = (App.CommandLineArguments.SingleInstance ?? true)

ILSpy/Commands/CheckForUpdatesCommand.cs

@@ -18,6 +18,7 @@
 
 
 using ICSharpCode.ILSpy.Properties;
+using ICSharpCode.ILSpyX.Settings;
 
 namespace ICSharpCode.ILSpy
 {

ILSpy/DecompilationOptions.cs

@@ -83,7 +83,7 @@ namespace ICSharpCode.ILSpy
 		internal int StepLimit = int.MaxValue;
 		internal bool IsDebug = false;
 
-		public DecompilationOptions(LanguageVersion version, Decompiler.DecompilerSettings settings, DisplaySettings displaySettings)
+		public DecompilationOptions(LanguageVersion version, Decompiler.DecompilerSettings settings, DisplaySettingsViewModel displaySettings)
 		{
 			if (!Enum.TryParse(version?.Version, out Decompiler.CSharp.LanguageVersion languageVersion))
 				languageVersion = Decompiler.CSharp.LanguageVersion.Latest;
@@ -96,7 +96,7 @@ namespace ICSharpCode.ILSpy
 			newSettings.CSharpFormattingOptions.IndentationString = GetIndentationString(displaySettings);
 		}
 
-		private string GetIndentationString(DisplaySettings displaySettings)
+		private string GetIndentationString(DisplaySettingsViewModel displaySettings)
 		{
 			if (displaySettings.IndentationUseTabs)
 			{

ILSpy/ILSpySettingsFilePathProvider.cs

@@ -0,0 +1,38 @@
+// Copyright (c) 2022 AlphaSierraPapa for the SharpDevelop Team
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a copy of this
+// software and associated documentation files (the "Software"), to deal in the Software
+// without restriction, including without limitation the rights to use, copy, modify, merge,
+// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
+// to whom the Software is furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in all copies or
+// substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
+// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+using System;
+using System.IO;
+
+using ICSharpCode.ILSpyX.Settings;
+
+namespace ICSharpCode.ILSpy
+{
+	internal class ILSpySettingsFilePathProvider : ISettingsFilePathProvider
+	{
+		public string GetSettingsFilePath()
+		{
+			if (App.CommandLineArguments.ConfigFile != null)
+				return App.CommandLineArguments.ConfigFile;
+			string localPath = Path.Combine(Path.GetDirectoryName(typeof(MainWindow).Assembly.Location), "ILSpy.xml");
+			if (File.Exists(localPath))
+				return localPath;
+			return Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "ICSharpCode\\ILSpy.xml");
+		}
+	}
+}

ILSpy/MainWindow.xaml.cs

@@ -52,6 +52,7 @@ using ICSharpCode.ILSpy.Themes;
 using ICSharpCode.ILSpy.TreeNodes;
 using ICSharpCode.ILSpy.ViewModels;
 using ICSharpCode.ILSpyX;
+using ICSharpCode.ILSpyX.Settings;
 using ICSharpCode.TreeView;
 
 using Microsoft.Win32;
@@ -103,7 +104,7 @@ namespace ICSharpCode.ILSpy
 
 		public DecompilerSettings CurrentDecompilerSettings { get; internal set; }
 
-		public DisplaySettings CurrentDisplaySettings { get; internal set; }
+		public DisplaySettingsViewModel CurrentDisplaySettings { get; internal set; }
 
 		public DecompilationOptions CreateDecompilationOptions()
 		{

ILSpy/Options/DecompilerSettingsPanel.xaml.cs

@@ -24,6 +24,8 @@ using System.Windows.Controls;
 using System.Windows.Data;
 using System.Xml.Linq;
 
+using ICSharpCode.ILSpyX.Settings;
+
 namespace ICSharpCode.ILSpy.Options
 {
 	/// <summary>
@@ -39,17 +41,7 @@ namespace ICSharpCode.ILSpy.Options
 
 		public static Decompiler.DecompilerSettings LoadDecompilerSettings(ILSpySettings settings)
 		{
-			XElement e = settings["DecompilerSettings"];
-			var newSettings = new Decompiler.DecompilerSettings();
-			var properties = typeof(Decompiler.DecompilerSettings).GetProperties()
-				.Where(p => p.GetCustomAttribute<BrowsableAttribute>()?.Browsable != false);
-			foreach (var p in properties)
-			{
-				var value = (bool?)e.Attribute(p.Name);
-				if (value.HasValue)
-					p.SetValue(newSettings, value.Value);
-			}
-			return newSettings;
+			return ISettingsProvider.LoadDecompilerSettings(settings);
 		}
 
 		public void Load(ILSpySettings settings)
@@ -59,19 +51,8 @@ namespace ICSharpCode.ILSpy.Options
 
 		public void Save(XElement root)
 		{
-			XElement section = new XElement("DecompilerSettings");
 			var newSettings = ((DecompilerSettingsViewModel)this.DataContext).ToDecompilerSettings();
-			var properties = typeof(Decompiler.DecompilerSettings).GetProperties()
-				.Where(p => p.GetCustomAttribute<BrowsableAttribute>()?.Browsable != false);
-			foreach (var p in properties)
-			{
-				section.SetAttributeValue(p.Name, p.GetValue(newSettings));
-			}
-			XElement existingElement = root.Element("DecompilerSettings");
-			if (existingElement != null)
-				existingElement.ReplaceWith(section);
-			else
-				root.Add(section);
+			ISettingsProvider.SaveDecompilerSettings(root, newSettings);
 
 			MainWindow.Instance.CurrentDecompilerSettings = newSettings;
 			MainWindow.Instance.AssemblyListManager.ApplyWinRTProjections = newSettings.ApplyWindowsRuntimeProjections;

ILSpy/Options/DisplaySettingsPanel.xaml

@@ -6,7 +6,7 @@
 			 xmlns:system="clr-namespace:System;assembly=mscorlib"
 			 xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d"
 			 xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
-			 d:DataContext="{d:DesignInstance local:DisplaySettings}">
+			 d:DataContext="{d:DesignInstance local:DisplaySettingsViewModel}">
 	<UserControl.Resources>
 		<local:FontSizeConverter x:Key="fontSizeConv" />
 	</UserControl.Resources>

ILSpy/Options/DisplaySettingsPanel.xaml.cs

@@ -26,6 +26,8 @@ using System.Windows.Media;
 using System.Windows.Threading;
 using System.Xml.Linq;
 
+using ICSharpCode.ILSpyX.Settings;
+
 namespace ICSharpCode.ILSpy.Options
 {
 	/// <summary>
@@ -94,10 +96,10 @@ namespace ICSharpCode.ILSpy.Options
 					select ff).ToArray();
 		}
 
-		public static DisplaySettings LoadDisplaySettings(ILSpySettings settings)
+		public static DisplaySettingsViewModel LoadDisplaySettings(ILSpySettings settings)
 		{
 			XElement e = settings["DisplaySettings"];
-			var s = new DisplaySettings();
+			var s = new DisplaySettingsViewModel();
 			s.SelectedFont = new FontFamily((string)e.Attribute("Font") ?? "Consolas");
 			s.SelectedFontSize = (double?)e.Attribute("FontSize") ?? 10.0 * 4 / 3;
 			s.ShowLineNumbers = (bool?)e.Attribute("ShowLineNumbers") ?? false;
@@ -124,7 +126,7 @@ namespace ICSharpCode.ILSpy.Options
 
 		public void Save(XElement root)
 		{
-			var s = (DisplaySettings)this.DataContext;
+			var s = (DisplaySettingsViewModel)this.DataContext;
 
 			var section = new XElement("DisplaySettings");
 			section.SetAttributeValue("Font", s.SelectedFont.Source);
@@ -174,7 +176,7 @@ namespace ICSharpCode.ILSpy.Options
 
 		public void LoadDefaults()
 		{
-			MainWindow.Instance.CurrentDisplaySettings.CopyValues(new DisplaySettings());
+			MainWindow.Instance.CurrentDisplaySettings.CopyValues(new DisplaySettingsViewModel());
 			this.DataContext = MainWindow.Instance.CurrentDisplaySettings;
 		}
 	}

ILSpy/Options/DisplaySettingsViewModel.cs

@@ -25,9 +25,9 @@ namespace ICSharpCode.ILSpy.Options
 	/// <summary>
 	/// Description of DisplaySettings.
 	/// </summary>
-	public class DisplaySettings : INotifyPropertyChanged
+	public class DisplaySettingsViewModel : INotifyPropertyChanged
 	{
-		public DisplaySettings()
+		public DisplaySettingsViewModel()
 		{
 			this.selectedFont = new FontFamily("Consolas");
 			this.selectedFontSize = 10.0 * 4 / 3;
@@ -312,7 +312,7 @@ namespace ICSharpCode.ILSpy.Options
 			}
 		}
 
-		public void CopyValues(DisplaySettings s)
+		public void CopyValues(DisplaySettingsViewModel s)
 		{
 			this.SelectedFont = s.selectedFont;
 			this.SelectedFontSize = s.selectedFontSize;

ILSpy/Options/MiscSettingsPanel.xaml.cs

@@ -19,6 +19,8 @@
 using System.Windows.Controls;
 using System.Xml.Linq;
 
+using ICSharpCode.ILSpyX.Settings;
+
 namespace ICSharpCode.ILSpy.Options
 {
 	/// <summary>
@@ -37,44 +39,31 @@ namespace ICSharpCode.ILSpy.Options
 			this.DataContext = LoadMiscSettings(settings);
 		}
 
-		static MiscSettings currentMiscSettings;
+		static MiscSettingsViewModel currentMiscSettings;
 
-		public static MiscSettings CurrentMiscSettings {
+		public static MiscSettingsViewModel CurrentMiscSettings {
 			get {
 				return currentMiscSettings ?? (currentMiscSettings = LoadMiscSettings(ILSpySettings.Load()));
 			}
 		}
 
-		public static MiscSettings LoadMiscSettings(ILSpySettings settings)
+		public static MiscSettingsViewModel LoadMiscSettings(ILSpySettings settings)
 		{
-			XElement e = settings["MiscSettings"];
-			var s = new MiscSettings();
-			s.AllowMultipleInstances = (bool?)e.Attribute(nameof(s.AllowMultipleInstances)) ?? false;
-			s.LoadPreviousAssemblies = (bool?)e.Attribute(nameof(s.LoadPreviousAssemblies)) ?? true;
-
-			return s;
+			var s = MiscSettings.Load(settings);
+			return new MiscSettingsViewModel(s);
 		}
 
 		public void Save(XElement root)
 		{
-			var s = (MiscSettings)this.DataContext;
-
-			var section = new XElement("MiscSettings");
-			section.SetAttributeValue(nameof(s.AllowMultipleInstances), s.AllowMultipleInstances);
-			section.SetAttributeValue(nameof(s.LoadPreviousAssemblies), s.LoadPreviousAssemblies);
-
-			XElement existingElement = root.Element("MiscSettings");
-			if (existingElement != null)
-				existingElement.ReplaceWith(section);
-			else
-				root.Add(section);
+			var s = (MiscSettingsViewModel)this.DataContext;
+			IMiscSettings.Save(root, s);
 
 			currentMiscSettings = null; // invalidate cached settings
 		}
 
 		public void LoadDefaults()
 		{
-			currentMiscSettings = new MiscSettings();
+			currentMiscSettings = new MiscSettingsViewModel(MiscSettings.Load(ILSpySettings.Load()));
 			this.DataContext = currentMiscSettings;
 		}
 	}

ILSpy/Options/MiscSettingsViewModel.cs

@@ -21,23 +21,26 @@ using System.ComponentModel;
 using System.IO;
 using System.Reflection;
 using System.Runtime.CompilerServices;
-using System.Security.Principal;
 using System.Windows;
 using System.Windows.Input;
 
 using ICSharpCode.ILSpy.Commands;
+using ICSharpCode.ILSpyX.Settings;
 
 using Microsoft.Win32;
 
 namespace ICSharpCode.ILSpy.Options
 {
-	public class MiscSettings : INotifyPropertyChanged
+	public class MiscSettingsViewModel : IMiscSettings, INotifyPropertyChanged
 	{
 		bool allowMultipleInstances;
 		bool loadPreviousAssemblies = true;
 
-		public MiscSettings()
+		public MiscSettingsViewModel(MiscSettings s)
 		{
+			AllowMultipleInstances = s.AllowMultipleInstances;
+			LoadPreviousAssemblies = s.LoadPreviousAssemblies;
+
 			AddRemoveShellIntegrationCommand = new DelegateCommand<object>(AddRemoveShellIntegration);
 		}
 

ILSpy/Options/OptionsDialog.xaml.cs

@@ -26,6 +26,7 @@ using System.Windows.Media;
 using System.Xml.Linq;
 
 using ICSharpCode.ILSpy.Properties;
+using ICSharpCode.ILSpyX.Settings;
 
 namespace ICSharpCode.ILSpy.Options
 {

ILSpy/SessionSettings.cs

@@ -29,6 +29,7 @@ using System.Xml.Linq;
 using ICSharpCode.ILSpy.Docking;
 using ICSharpCode.ILSpy.Themes;
 using ICSharpCode.ILSpyX.Search;
+using ICSharpCode.ILSpyX.Settings;
 
 namespace ICSharpCode.ILSpy
 {

ILSpy/TextView/DecompilerTextView.cs

@@ -174,11 +174,11 @@ namespace ICSharpCode.ILSpy.TextView
 
 		void CurrentDisplaySettings_PropertyChanged(object? sender, PropertyChangedEventArgs e)
 		{
-			if (e.PropertyName == nameof(DisplaySettings.ShowLineNumbers))
+			if (e.PropertyName == nameof(DisplaySettingsViewModel.ShowLineNumbers))
 			{
 				ShowLineMargin();
 			}
-			else if (e.PropertyName == nameof(DisplaySettings.HighlightCurrentLine))
+			else if (e.PropertyName == nameof(DisplaySettingsViewModel.HighlightCurrentLine))
 			{
 				SetHighlightCurrentLine();
 			}

ILSpy/Themes/WindowStyleManagerBehavior.cs

@@ -65,7 +65,7 @@ namespace ICSharpCode.ILSpy.Themes
 
 		private void DisplaySettings_PropertyChanged(object sender, PropertyChangedEventArgs e)
 		{
-			if (e.PropertyName == nameof(DisplaySettings.StyleWindowTitleBar))
+			if (e.PropertyName == nameof(DisplaySettingsViewModel.StyleWindowTitleBar))
 			{
 				if (!MainWindow.Instance.CurrentDisplaySettings.StyleWindowTitleBar)
 				{

TestPlugin/CustomOptionPage.xaml.cs

@@ -7,6 +7,7 @@ using System.Xml.Linq;
 
 using ICSharpCode.ILSpy;
 using ICSharpCode.ILSpy.Options;
+using ICSharpCode.ILSpyX.Settings;
 
 namespace TestPlugin
 {