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
salvatore montella said:I should implement a RuleCondition that evaluates the value of a property of an ItemType
I too would like to find the programming answer to your question.
The syntax of expressions, rules, reports and queries is not intuitive, well-documented or well-supplied with examples. But if more of us demonstrate our interest to Bentley Systems, perhaps they will react positively?
salvatore montella said:Is there a reference guide describing the schemas and the expression syntax?
That too would be useful.
Regards, Jon Summers LA Solutions
Hi Salvatore,
can you provide a DGN as an example, what would be expected result? I guess something like ItemType attached to an element plus display rule defined in some style...
Regards,
Jan
Bentley Accredited Developer: iTwin Platform - AssociateLabyrinth Technology | dev.notes() | cad.point
DisplayRules.dgn
For this file I would like to create a condition that allows me to select the shape (the larger one to which an ItemType is attached) where the value of the L08_SHIP_ZONE property is = "FOO".Something like:string MyRuleCondition = @"element.DgnElementSchema::ShapeElement::IDES_ITEMTYPE.L08_SHIP_ZONE = ""FOO""";
salvatore montella said:For this file I would like to create a condition that allows me to select the shape (the larger one to which an ItemType is attached) where the value of the L08_SHIP_ZONE property is = "FOO".
Are you able to do it (configure the display rule) manually?
Yes
salvatore montella said:Yes
Thanks for the confirmation, I was able to modify your example accordingly (manually).
DisplayRules_ManualConfig.dgn
In this file there is the display rule configured manually
salvatore montella said:string MyRuleCondition = @"element.DgnElementSchema::ShapeElement::IDES_ITEMTYPE.L08_SHIP_ZONE = ""FOO""";
an idea, without writing any test code
Because as noted in documentation you linked, the format is
HostName.SchemaName::ClassName::Propertyname OPERATOR VALUE
I assume the definition cannot be based on DgnElementSchema, because it's not schema defining ItemType you attached.
Maybe something like
element.DgnCustomItemTypes_IDES_TYPELIBRARY::IDES_ITEMTYPE::L08_SHIP_ZONE = "FOO"
With regards,
Hi Jan, your suggestion resolved my issue.I was not able to figure how to determine the schema name of the ItemTypeLibary in the condition's expression.
Since there is no match between the condition expression shown in the user's interface and the expression required in code I don't know how to write the condition's expression.
E.G. "ELEMENT Is Shapes" in the UI became "element.IsOfClass ("ShapeElement","DgnElementSchema")" in the code.
Is there a reference guide describing the schemas and the expression syntax?
Best regards
Hi salvatore,
salvatore montella said:I was not able to figure how to determine the schema name of the ItemTypeLibary in the condition's expression.
it's "simple" (when you know it :-) ). When you need to know intrinsict (stored in DGN file) EC schemas, and ItemTypes EC schemas are alwayas intrinsict, use "ecx schema list" key-in, that lists the schemas to Message Center Details.
Graphical elements features like color etc. are defined in extrinsict EC schema DgnElementSchema.
salvatore montella said:Since there is no match between the condition expression shown in the user's interface and the expression required in code
There is no reason why there should be the match. It seems description is filled automatically by a summary, but it's not the condition syntax.
salvatore montella said: I don't know how to write the condition's expression.
Well ... as written in the documentation you linked: DisplayRule condition is based on ECExpression. I agree it tells nothing for a plain user, and also for developers it's not clear for 100% (because "is based on" expresses that it's only a subset of ECExpression). But at least, it's defines the basic syntax format.
I think the description provided in DisplayRule API documentation is where you should start. Despite of it's short, I think it covers the most of needs and scenarios.
Two other sources are:
The problem is that without good knowledge of the whole "EC world" (which is very wide and complex topic), some concepts behind and terminology will remain unexplained.