Using property ExplicitlyIgnore instead of Ignore, so types that are not referenced can still be referenced.

src/AST/Class.cs

@@ -149,7 +149,7 @@ namespace CppSharp.AST
             {
                 foreach (var @base in Bases)
                 {
-                    if (@base.IsClass && !@base.Class.Ignore)
+                    if (@base.IsClass && !@base.Class.ExplicityIgnored)
                         return @base.Class;
                 }
 

src/Generator/Generators/CLI/CLIHeadersTemplate.cs

@@ -68,7 +68,7 @@ namespace CppSharp.Generators.CLI
                 var include = typeRef.Include;
                 var unit = include.TranslationUnit;
 
-                if (unit != null && unit.Ignore)
+                if (unit != null && unit.ExplicityIgnored)
                     continue;
 
                 if(!string.IsNullOrEmpty(include.File) && include.InHeader)

src/Generator/Generators/CLI/CLISourcesTemplate.cs

@@ -652,7 +652,7 @@ namespace CppSharp.Generators.CLI
 
         private bool GenerateClassConstructorBase(Class @class, bool isIntPtr, Method method = null)
         {
-            var hasBase = @class.HasBase && @class.Bases[0].IsClass && !@class.Bases[0].Class.Ignore;
+            var hasBase = @class.HasBase && @class.Bases[0].IsClass && !@class.Bases[0].Class.ExplicityIgnored;
             if (!hasBase)
                 return false;
 

src/Generator/Generators/CLI/CLITypeReferences.cs

@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using CppSharp.AST;
 using CppSharp.AST.Extensions;
 using CppSharp.Generators.AST;
@@ -111,7 +112,7 @@ namespace CppSharp.Generators.CLI
             if(decl.Namespace.TranslationUnit.IsSystemHeader)
                 return;
 
-            if(decl.Ignore)
+            if(decl.ExplicityIgnored)
                 return;
 
             if(IsBuiltinTypedef(decl))
@@ -157,7 +158,7 @@ namespace CppSharp.Generators.CLI
             if (decl.Namespace != null && decl.Namespace.TranslationUnit.IsSystemHeader)
                 return false;
 
-            return !decl.Ignore;
+            return !decl.ExplicityIgnored;
         }
 
         public override bool VisitClassDecl(Class @class)

src/Generator/Generators/CSharp/CSharpTextTemplate.cs

@@ -710,7 +710,7 @@ namespace CppSharp.Generators.CSharp
                 baseClass = @class.Bases[0].Class;
 
             var hasRefBase = baseClass != null && baseClass.IsRefType
-                             && !baseClass.Ignore;
+                             && !baseClass.ExplicityIgnored;
 
             return hasRefBase;
         }