CE Display Rules C#

Hello, I'm trying to develop an add-in for creating Display Rules in c #. I have a problem creating the condition to pass as a parameter to the constructor of the DisplayRule class.
At this link "">www.bimsdks.com/.../structBentley_1_1DgnPlatform_1_1DisplayRule.html" I found some examples (see Condition format and types) but they are very few.

I implemented the following code that works:

string MyRuleCondition = @"element.IsOfClass (""ShapeElement"",""DgnElementSchema"")";

DisplayRuleSet displayRuleSet = new DisplayRuleSet(RuleStenName, dgnFile);
DisplayRulesManager.WriteDisplayRuleSetToFile(displayRuleSet, dgnFile, true);
DisplayRule displayRuleElement = new DisplayRule(MyRuleCondition, true, dgnFile);

IDisplayRuleAction ruleAction = new ColorOverrideAction(5, dgnFile);
displayRuleElement.AddAction(ruleAction);
displayRuleSet.AddDisplayRule(displayRuleElement);
DisplayRulesManager.WriteDisplayRuleSetToFile(displayRuleSet, dgnFile, true);

keyInCommand.SendKeyin("MDL KEYIN CUSTOMDISPMODE DIALOG DISPLAYSTYLES");
keyInCommand.SendKeyin(@"DISPLAYSTYLE CREATE ""DISPLAY_STYLE_BY_KEYIN""");

keyInCommand.SendKeyin(@"MDL KEYIN VIEWCTRL CHANGE VIEW CUSTOM ""DISPLAY_STYLE_BY_KEYIN"" 1");
keyInCommand.SendKeyin(@"DISPLAYSTYLE SETPARAM DISPLAYRULESET ""DISPLAY_STYLE_BY_KEYIN"" ""Rule""");
ustnApp.CommandState.StartDefaultCommand();


I should implement a RuleCondition that evaluates the value of a property of an ItemType,
does anyone know a way, a tool, or examples (in c #) to create RuleConditions?

Thanks for the help, greetings