From d420a302ec8dae11aee443ebcbe9ad556529620a Mon Sep 17 00:00:00 2001
From: Siegfried Pammer <siegfriedpammer@gmail.com>
Date: Sun, 17 Feb 2019 08:56:22 +0100
Subject: [PATCH] Reactivate SearchMsdnContextMenuEntry.

---
 ILSpy/TreeNodes/SearchMsdnContextMenuEntry.cs | 38 +++++++++++--------
 1 file changed, 23 insertions(+), 15 deletions(-)

diff --git a/ILSpy/TreeNodes/SearchMsdnContextMenuEntry.cs b/ILSpy/TreeNodes/SearchMsdnContextMenuEntry.cs
index 7f10c0dfe..3fdff767c 100644
--- a/ILSpy/TreeNodes/SearchMsdnContextMenuEntry.cs
+++ b/ILSpy/TreeNodes/SearchMsdnContextMenuEntry.cs
@@ -17,11 +17,11 @@
 // DEALINGS IN THE SOFTWARE.
 
 using System.Linq;
-using System.Diagnostics;
+using ICSharpCode.Decompiler.TypeSystem;
 
 namespace ICSharpCode.ILSpy.TreeNodes
 {
-	/*[ExportContextMenuEntry(Header = "Search MSDN...", Icon = "images/SearchMsdn.png", Order = 9999)]
+	[ExportContextMenuEntry(Header = "Search MSDN...", Icon = "images/SearchMsdn.png", Order = 9999)]
 	internal sealed class SearchMsdnContextMenuEntry : IContextMenuEntry
 	{
 		private static string msdnAddress = "http://msdn.microsoft.com/en-us/library/{0}";
@@ -47,34 +47,42 @@ namespace ICSharpCode.ILSpy.TreeNodes
 
 			foreach (var node in context.SelectedTreeNodes)
 			{
-				var typeNode = node as TypeTreeNode;
-				if (typeNode != null && !typeNode.IsPublicAPI)
+				if (node is TypeTreeNode typeNode && !typeNode.IsPublicAPI)
 					return false;
 
-				var eventNode = node as EventTreeNode;
-				if (eventNode != null && (!eventNode.IsPublicAPI || !eventNode.EventDefinition.DeclaringType.IsPublic))
+				if (node is EventTreeNode eventNode && (!eventNode.IsPublicAPI || !IsAccessible(eventNode.EventDefinition)))
 					return false;
 
-				var fieldNode = node as FieldTreeNode;
-				if (fieldNode != null && (!fieldNode.IsPublicAPI || !fieldNode.FieldDefinition.DeclaringType.IsPublic))
+				if (node is FieldTreeNode fieldNode && (!fieldNode.IsPublicAPI || !IsAccessible(fieldNode.FieldDefinition)))
 					return false;
 
-				var propertyNode = node as PropertyTreeNode;
-				if (propertyNode != null && (!propertyNode.IsPublicAPI || !propertyNode.PropertyDefinition.DeclaringType.IsPublic))
+				if (node is PropertyTreeNode propertyNode && (!propertyNode.IsPublicAPI || !IsAccessible(propertyNode.PropertyDefinition)))
 					return false;
 
-				var methodNode = node as MethodTreeNode;
-				if (methodNode != null && (!methodNode.IsPublicAPI || !methodNode.MethodDefinition.DeclaringType.IsPublic))
+				if (node is MethodTreeNode methodNode && (!methodNode.IsPublicAPI || !IsAccessible(methodNode.MethodDefinition)))
 					return false;
 
-				var namespaceNode = node as NamespaceTreeNode;
-				if (namespaceNode != null && string.IsNullOrEmpty(namespaceNode.Name))
+				if (node is NamespaceTreeNode namespaceNode && string.IsNullOrEmpty(namespaceNode.Name))
 					return false;
 			}
 
 			return true;
 		}
 
+		bool IsAccessible(IEntity entity)
+		{
+			if (entity.DeclaringTypeDefinition == null)
+				return false;
+			switch (entity.DeclaringTypeDefinition.Accessibility) {
+				case Accessibility.Public:
+				case Accessibility.Protected:
+				case Accessibility.ProtectedOrInternal:
+					return true;
+				default:
+					return false;
+			}
+		}
+
 		public void Execute(TextViewContext context)
 		{
 			if (context.SelectedTreeNodes != null) {
@@ -108,5 +116,5 @@ namespace ICSharpCode.ILSpy.TreeNodes
 			if (!string.IsNullOrEmpty(address))
 				MainWindow.OpenLink(address);
 		}
-	}*/
+	}
 }
\ No newline at end of file