Added Capture method for WebForms

--HG--
branch : theming

src/Orchard/Mvc/ViewPage.cs

@@ -51,29 +51,30 @@ namespace Orchard.Mvc {
         }
 
         public IDisposable Capture(Action<IHtmlString> callback) {
-            return new ViewContextSubstitution(Writer, callback);
+            return new CaptureScope(Writer, callback);
         }
 
-    }
+        public class CaptureScope : IDisposable {
-
-    public class ViewContextSubstitution : IDisposable {
             private readonly HtmlTextWriter _context;
             private readonly Action<IHtmlString> _callback;
             private readonly TextWriter _oldWriter;
-        private readonly TextWriter _writer;
+            private readonly HtmlStringWriter _writer;
 
-        public ViewContextSubstitution(HtmlTextWriter context, Action<IHtmlString> callback) {
+            public CaptureScope(HtmlTextWriter context, Action<IHtmlString> callback) {
                 _context = context;
                 _oldWriter = _context.InnerWriter;
                 _callback = callback;
-            _context.InnerWriter = _writer = new StringWriter();
+                _context.InnerWriter = _writer = new HtmlStringWriter();
             }
 
             public void Dispose() {
-            _callback(new HtmlString(_writer.ToString()));
+                _callback(_writer);
                 _context.InnerWriter = _oldWriter;
             }
         }
+
+    }
+
     public class ViewPage : ViewPage<dynamic> {
     }
 }

src/Orchard/Mvc/ViewUserControl.cs

@@ -53,7 +53,7 @@ namespace Orchard.Mvc {
         }
 
         public IDisposable Capture(Action<IHtmlString> callback) {
-            return new ViewContextSubstitution(Writer, callback);
+            return new ViewPage.CaptureScope(Writer, callback);
         }
 
     }