Auto-activates and resolves work items when child work items change

TFSAggregatorPolicies.xml

    <rule name="AutoActivate" appliesTo="Task,User Story,Feature,Bug">
    <![CDATA[
    if((string)self["System.State"] == "Active")
    {
		string currentParentState = null;
		var requirementTypeNames = new[] { "User Story", "Feature", "Epic" };
        if(self.HasParent() && (currentParentState = (string)self.Parent["System.State"]) != "Active")
        {
			string reason;
			if (requirementTypeNames.Contains(self.Parent.TypeName))
			{
				switch (currentParentState)
				{
					case "Closed":
						reason = "Reintroduced in Scope";
						break;
					case "Resolved":
						reason = "Acceptance tests fail";
						break;
					default: // New, Removed
						reason = "Implementation started";
						break;
				}
			}
			else if (self.Parent.TypeName == "Bug")
			{
				switch (currentParentState)
				{
					case "Closed":
						reason = "Reactivated";
						break;
					case "Resolved":
						reason = "Not fixed";
						break;
					default:
						reason = "Investigate";
						break;
				}
			}
			else
			{
				// Task
				if (currentParentState == "Closed")
				{
					reason = "Reactivated";
				}
				else
				{
					reason = "Work started";
				}
			}
			
			if(string.IsNullOrEmpty((string)self.Parent["System.AssignedTo"]) && !string.IsNullOrEmpty((string)self["System.AssignedTo"]))
			{
				self.Parent["System.AssignedTo"] = self["System.AssignedTo"];
			}
			
			self.Parent.TransitionToState("Active", reason);
        }
    }
    ]]>
	</rule>
    
    <rule name="AutoResolve" appliesTo="Task,User Story,Feature,Bug">
    <![CDATA[
        if(((string)self["System.State"] == "Closed" || (string)self["System.State"] == "Resolved") && self.HasParent() && ((string)self.Parent["System.State"]) != "Resolved")
        {
            var requirementTypeNames = new[] { "User Story", "Feature", "Epic", "Bug" };
            var possibleStates = new [] { "Closed", "Removed", "Resolved" };
            if(requirementTypeNames.Contains(self.Parent.TypeName))
            {
                if(self.Parent.Children.All(child => possibleStates.Contains((string)child["System.State"])))
                {
                    string reason;                
                    switch(self.Parent.TypeName)
                    {
                        case "User Story":
                            reason = "Code complete and unit tests pass";
                            break;
                        case "Feature":
                            reason = "Stories complete";
                            break;
                        case "Epic":
                            reason = "Features complete";
                            break;
                        case "Bug":
                            reason = "Fixed";
                            break;
                        default:
                            reason = "Work done - automatic resolve";
                            break;
                    }
                    self.Parent.TransitionToState("Resolved", reason);
                }
            }
        }
    ]]>
    </rule>