Removed a few private setters and modernized a few argument checks

ILSpy/DecompilationOptions.cs

@@ -67,7 +67,7 @@ namespace ICSharpCode.ILSpy
 		/// <summary>
 		/// Gets the settings for the decompiler.
 		/// </summary>
-		public Decompiler.DecompilerSettings DecompilerSettings { get; private set; }
+		public Decompiler.DecompilerSettings DecompilerSettings { get; }
 
 		/// <summary>
 		/// Gets/sets an optional state of a decompiler text view.

ILSpy/NavigationState.cs

@@ -32,8 +32,8 @@ namespace ICSharpCode.ILSpy
 		private readonly HashSet<SharpTreeNode> treeNodes;
 
 		public IEnumerable<SharpTreeNode> TreeNodes => treeNodes;
-		public ViewState ViewState { get; private set; }
-		public TabPageModel TabPage { get; private set; }
+		public ViewState ViewState { get; }
+		public TabPageModel TabPage { get; }
 
 		public NavigationState(TabPageModel tabPage, ViewState viewState)
 		{

ILSpy/SessionSettings.cs

@@ -125,7 +125,7 @@ namespace ICSharpCode.ILSpy
 		public double SplitterPosition;
 		public double TopPaneSplitterPosition, BottomPaneSplitterPosition;
 
-		public DockLayoutSettings DockLayout { get; private set; }
+		public DockLayoutSettings DockLayout { get; }
 
 		public XElement ToXml()
 		{

ILSpy/TextView/BracketHighlightRenderer.cs

@@ -51,13 +51,13 @@ namespace ICSharpCode.ILSpy.TextView
 	/// </summary>
 	public class BracketSearchResult
 	{
-		public int OpeningBracketOffset { get; private set; }
+		public int OpeningBracketOffset { get; }
 
-		public int OpeningBracketLength { get; private set; }
+		public int OpeningBracketLength { get; }
 
-		public int ClosingBracketOffset { get; private set; }
+		public int ClosingBracketOffset { get; }
 
-		public int ClosingBracketLength { get; private set; }
+		public int ClosingBracketLength { get; }
 
 		public BracketSearchResult(int openingBracketOffset, int openingBracketLength,
 								   int closingBracketOffset, int closingBracketLength)
@@ -90,7 +90,7 @@ namespace ICSharpCode.ILSpy.TextView
 		public BracketHighlightRenderer(ICSharpCode.AvalonEdit.Rendering.TextView textView)
 		{
 			if (textView == null)
-				throw new ArgumentNullException("textView");
+				throw new ArgumentNullException(nameof(textView));
 
 			this.borderPen = (Pen)textView.FindResource(Themes.ResourceKeys.BracketHighlightBorderPen);
 			this.backgroundBrush = (SolidColorBrush)textView.FindResource(Themes.ResourceKeys.BracketHighlightBackgroundBrush);

ILSpy/TextView/DocumentationUIBuilder.cs

@@ -145,7 +145,7 @@ namespace ICSharpCode.ILSpy.TextView
 		public void AddDocumentationElement(XmlDocumentationElement element)
 		{
 			if (element == null)
-				throw new ArgumentNullException("element");
+				throw new ArgumentNullException(nameof(element));
 			if (element.IsTextNode)
 			{
 				AddText(element.TextContent);

ILSpy/TreeNodes/ResourceNodes/ResourcesFileTreeNode.cs

@@ -214,9 +214,9 @@ namespace ICSharpCode.ILSpy.TreeNodes
 				this.Value = value;
 			}
 
-			public string Key { get; private set; }
-			public string Type { get; private set; }
-			public string Value { get; private set; }
+			public string Key { get; }
+			public string Type { get; }
+			public string Value { get; }
 		}
 	}
 }