[asp.net] Part of fix for bug #579837. AuthorizationRule.SerializeEle…

…ment will not process unmodified elements.

* AuthorizationRule.cs: if the configuration save is not Full, SerializeElement checks whether the rule being
  serialized is modified. If it isn't, validation and serialization are not performed.
* AuthorizationRuleCollection.cs: there is no element name for the collection.

mcs/class/System.Web/System.Web.Configuration_2.0/AuthorizationRule.cs

@@ -49,7 +49,8 @@ public sealed class AuthorizationRule : ConfigurationElement
 		static ConfigurationPropertyCollection properties;
 
 		AuthorizationRuleAction action;
-
+		ConfigurationSaveMode saveMode = ConfigurationSaveMode.Full;
+
 		static AuthorizationRule ()
 		{
 			rolesProp = new ConfigurationProperty ("roles", typeof (StringCollection), null,
@@ -130,7 +131,10 @@ public override int GetHashCode ()
 		[MonoTODO ("Not implemented")]
 		protected override bool IsModified ()
 		{
-			throw new NotImplementedException ();
+			if (((CommaDelimitedStringCollection)Roles).IsModified || ((CommaDelimitedStringCollection)Users).IsModified || ((CommaDelimitedStringCollection)Verbs).IsModified)
+				return true;
+
+			return false;
 		}
 
 		void VerifyData ()
@@ -168,6 +172,9 @@ protected override void ResetModified ()
 
 		protected override bool SerializeElement (XmlWriter writer, bool serializeCollectionKey)
 		{
+			if (saveMode != ConfigurationSaveMode.Full && !IsModified ())
+				return true;
+
 			PreSerialize (writer);
 
 			writer.WriteStartElement (action == AuthorizationRuleAction.Allow ? "allow" : "deny");
@@ -191,6 +198,7 @@ protected override void SetReadOnly ()
 		protected override void Unmerge (ConfigurationElement sourceElement, ConfigurationElement parentElement, ConfigurationSaveMode saveMode)
 		{
 			base.Unmerge (sourceElement, parentElement, saveMode);
+			this.saveMode = saveMode;
 		}
 
 		public AuthorizationRuleAction Action {

mcs/class/System.Web/System.Web.Configuration_2.0/AuthorizationRuleCollection.cs

@@ -108,9 +108,8 @@ public void Set (int index, AuthorizationRule rule)
 			get { return ConfigurationElementCollectionType.BasicMapAlternate; }
 		}
 
-		[MonoTODO ("is it okay to return a comma delimited string here?")]
 		protected override string ElementName {
-			get { return "allow,deny"; }
+			get { return String.Empty; }
 		}
 
 		public AuthorizationRule this [int index] {