fix #509 Visual Studio Addin is useless for Framework Assemblies

ILSpy.AddIn/ILSpyAddInPackage.cs

@@ -10,6 +10,7 @@ using Microsoft.VisualStudio.OLE.Interop;
 using Microsoft.VisualStudio.Shell;
 using System.Reflection;
 using System.IO;
+using Mono.Cecil;
 
 namespace ICSharpCode.ILSpy.AddIn
 {
@@ -86,13 +87,19 @@ namespace ICSharpCode.ILSpy.AddIn
 		private void OpenInILSpyCallback(object sender, EventArgs e)
 		{
 			var explorer = ((EnvDTE80.DTE2)GetGlobalService(typeof(EnvDTE.DTE))).ToolWindows.SolutionExplorer;
-			var items =(object[]) explorer.SelectedItems ;
+			var items =(object[]) explorer.SelectedItems;
 
 			foreach (EnvDTE.UIHierarchyItem item in items) {
-				dynamic obj = item.Object;
-				OpenAssemblyInILSpy(obj.Path);
+				dynamic reference = item.Object;
+				string path = null;
+				if (reference.PublicKeyToken != "") {
+					var token = Utils.HexStringToBytes(reference.PublicKeyToken);
+					path = GacInterop.FindAssemblyInNetGac(new AssemblyNameReference(reference.Identity, new Version(reference.Version)) { PublicKeyToken = token });
+				}
+				if (path == null)
+					path = reference.Path;
+				OpenAssemblyInILSpy(path);
 			}
-
 		}
 
 		private void OpenILSpyCallback(object sender, EventArgs e)

ILSpy.AddIn/Utils.cs

@@ -100,5 +100,25 @@ namespace ICSharpCode.ILSpy.AddIn
 		}
 		#endregion
 
+		public static byte[] HexStringToBytes(string hex)
+		{
+			var result = new byte[hex.Length / 2];
+			for (int i = 0; i < hex.Length / 2; i++) {
+				result[i] = (byte)(ParseNibble(hex[i * 2]) * 16
+								 + ParseNibble(hex[i * 2 + 1]));
+			}
+			return result;
+		}
+
+		static int ParseNibble(char c)
+		{
+			if (c >= '0' && c <= '9')
+				return c - '0';
+			if (c >= 'A' && c <= 'F')
+				return c - 'A' + 10;
+			if (c >= 'a' && c <= 'f')
+				return c - 'a' + 10;
+			throw new ArgumentException("Invalid hex digit: " + c);
+		}
 	}
 }

ILSpy/Properties/AssemblyInfo.template.cs

@@ -3,6 +3,7 @@
 using System;
 using System.Resources;
 using System.Reflection;
+using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 
 #endregion
@@ -29,6 +30,8 @@ using System.Runtime.InteropServices;
 [assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2243:AttributeStringLiteralsShouldParseCorrectly",
 	Justification = "AssemblyInformationalVersion does not need to be a parsable version")]
 
+[assembly: InternalsVisibleTo("ILSpy.AddIn, PublicKey=0024000004800000940000000602000000240000525341310004000001000100653c4a319be4f524972c3c5bba5fd243330f8e900287d9022d7821a63fd0086fd3801e3683dbe9897f2ecc44727023e9b40adcf180730af70c81c54476b3e5ba8b0f07f5132b2c3cc54347a2c1a9d64ebaaaf3cbffc1a18c427981e2a51d53d5ab02536b7550e732f795121c38a0abfdb38596353525d034baf9e6f1fd8ac4ac")]
+
 internal static class RevisionClass
 {
 	public const string Major = "2";