Abstract check for file formats including all known versions (#348)

Author: twsouthwick

DocumentFormat.OpenXml/OfficeVersions.cs

@@ -20,6 +20,20 @@ public static bool Any(this FileFormatVersions version)
                 || version == FileFormatVersions.Office2013;
         }
 
+        /// <summary>
+        /// Determines if the supplied version is valid for all versions
+        /// </summary>
+        /// <param name="version">The version to check</param>
+        /// <returns>True if the version is all of the known versions, otherwise false</returns>
+        public static bool All(this FileFormatVersions version)
+        {
+            var all = FileFormatVersions.Office2007
+                | FileFormatVersions.Office2010
+                | FileFormatVersions.Office2013;
+
+            return version == all;
+        }
+
         /// <summary>
         /// Combines values for the given version and all versions that come after it
         /// </summary>

DocumentFormat.OpenXml/src/Framework/AlternateContent.cs

@@ -799,7 +799,7 @@ internal bool IsProcessContent(OpenXmlElement element)
 
         internal AttributeAction GetAttributeAction(string ns, string localName, FileFormatVersions format)
         {
-            if (format == (FileFormatVersions.Office2010 | FileFormatVersions.Office2007) || format == (FileFormatVersions.Office2010 | FileFormatVersions.Office2007 | FileFormatVersions.Office2013))
+            if (format == (FileFormatVersions.Office2010 | FileFormatVersions.Office2007) || format.All())
             {
                 return AttributeAction.Normal;
             }
@@ -829,7 +829,7 @@ internal AttributeAction GetAttributeAction(string ns, string localName, FileFor
 
         internal ElementAction GetElementAction(OpenXmlElement element, FileFormatVersions format)
         {
-            if (format == (FileFormatVersions.Office2010 | FileFormatVersions.Office2007) || format == (FileFormatVersions.Office2010 | FileFormatVersions.Office2007 | FileFormatVersions.Office2013))
+            if (format == (FileFormatVersions.Office2010 | FileFormatVersions.Office2007) || format.All())
             {
                 return ElementAction.Normal;
             }