#18488: Fixing import/export for Orchard.Fields

Work Item: 18488

--HG--
branch : 1.x

src/Orchard/ContentManagement/Handlers/ImportContentContext.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Xml.Linq;
 
 namespace Orchard.ContentManagement.Handlers {
@@ -21,6 +22,25 @@ namespace Orchard.ContentManagement.Handlers {
             return null;
         }
 
+        public void ImportAttribute(string elementName, string attributeName, Action<string> value) {
+            ImportAttribute(elementName, attributeName, value, () => { });
+        }
+
+        public void ImportAttribute(string elementName, string attributeName, Action<string> value, Action empty) {
+            var importedText = Attribute(elementName, attributeName);
+            if (importedText != null) {
+                try {
+                    value(importedText);
+                }
+                catch {
+                    empty();
+                }
+            }
+            else {
+                empty();
+            }
+        }
+
         public ContentItem GetItemFromSession(string id) {
             return Session.Get(id);
         }