IfcDoc.FormEdit.DeleteReferencesForSchemaDefinition C# (CSharp) Méthode

        private void DeleteReferencesForSchemaDefinition(DocSchema docSchema, DocDefinition docDef)
        {
            // delete attribute(s) referencing the definition
            foreach (DocEntity docEnt in docSchema.Entities)
            {
                for (int iAttr = docEnt.Attributes.Count - 1; iAttr >= 0; iAttr--)
                {
                    DocAttribute docAttr = docEnt.Attributes[iAttr];
                    if (docAttr.Definition == docDef)
                    {
                        docAttr.Delete();
                        docEnt.Attributes.RemoveAt(iAttr);
                    }
                }
            }

            for(int iType = docSchema.Types.Count-1; iType >= 0; iType--)
            {
                DocType docType = docSchema.Types[iType];
                if (docType is DocDefined)
                {
                    DocDefined docDefined = (DocDefined)docType;
                    if (docDefined.Definition == docDef)
                    {
                        docDefined.Delete();
                        docSchema.Types.RemoveAt(iType);
                    }
                }
            }

            // delete page refs referencing the definition
            for (int iPage = docSchema.PageTargets.Count - 1; iPage >= 0; iPage--)
            {
                DocPageTarget docPageTarget = docSchema.PageTargets[iPage];
                if(docPageTarget.Definition == docDef)
                {
                    // cascade deletion of sources
                    foreach(DocPageSource docPageSource in docPageTarget.Sources)
                    {
                        DeleteReferencesForSchemaDefinition(docSchema, docPageSource);
                    }

                    docPageTarget.Delete();
                    docSchema.PageTargets.RemoveAt(iPage);
                }
            }

            this.ctlExpressG.Schema = docSchema; // redraw
        }