Background

There is a requirement to generate an ec expression that validate the multiple nulls for a tag expression. In this wiki article, we will learn the possible customization that is required to achieve.

Steps to Accomplish

1. Load OpenPlant Project Administrator CONNECT Edition.
2. Expand the workset and select desired associated application, in this case OpenPlant Modeler.
3. From ribbon tab, select Settings > Expression Editor as shown below.
   
   
   
   
4. This will load Expression Editor dialog. Search for desired class name and pick the property. In this case, Pipeline as class and NAME as property has been selected.
5. For writing the EC Expression the criteria has been assumed where Tracing and Insulation thickness can be NULL. Please note that here Tracing is a string type property whereas Insulation Thickness is a double type property.
   
   EC Expression: this.UNIT & this.NUMBER & "-" & this.NOMINAL_DIAMETER & this.SPECIFICATION & IIF(this.INSULATION_THICKNESS>0,"-" & this.INSULATION_THICKNESS & this.INSULATION, "") & IIF(System.String.Length(this.TRACING)>0,"-" & this.TRACING, "")
   
   
   
   Notice that System.String.Length has been used where property data type is of string type. It is not required where property data type is of double type.
   
   
6. Validate the expression and save the changes.
7. Click on OK and close OpenPlant Project Administrator.
8. Load OpenPlant Modeler, create a new pipeline name based on requirement and verify the result.
   
   

See Also