If the corridor has a template drop assigned and now user wants a different template to assign to a corridor. The below code snippet shows how to achieve this. In below code we take a first template drop from all TemplateDrops of a corridor and edit its template.

Example

public bool ChangeTemplateOfTemplateDrop(Corridor corridor)
        {
            //Change template of first template drop of corridor 
            //Iterave over all template drops of corridor
            foreach (TemplateDrop td in corridor.TemplateDrops)
            {
                //Template library name
                string templateName = "C:\\ProgramData\\Bentley\\OpenRoads Designer CE 10.11\\
Configuration\\Organization-Civil\\_Civil Default Standards - Imperial\\Template Library\\OpenRoadsTemplatesImperial.itl";
                //Template path from template library
                string templatePath = "Templates\\Rural\\Asphalt Pavt w/ Asphalt Shoulders\\Undivided\\2 Lanes";

                //Load a templateof given path from template library
                Bentley.CifNET.GeometryModel.SDK.TemplateLibrary templateLibary = 
Bentley.CifNET.GeometryModel.SDK.TemplateLibrary.Load(templateName, templatePath);
                if (null == templateLibary) return false;
                Bentley.CifNET.GeometryModel.SDK.TemplateDefinition templateDefinition = 
templateLibary.ActiveTemplate;
                if (null == templateDefinition) return false;

                //Set the new template to template drop
                td.SetTemplate(templateDefinition);
                break;
            }
            return true;
        }

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The SetTemplate API of Bentley.CifNET.GeometryModel.SDK.TemplateDrop is used to change the template. The parameters required are template library and a new template path from template library. The template path includes the category and subcategories.