IfcDoc.FormEdit.toolStripMenuItemInsertReference_Click C# (CSharp) Method

        private void toolStripMenuItemInsertReference_Click(object sender, EventArgs e)
        {
            using(FormSelectEntity form = new FormSelectEntity(null, null, this.m_project, SelectDefinitionOptions.Entity | SelectDefinitionOptions.Type))
            {
                if(form.ShowDialog(this) == System.Windows.Forms.DialogResult.OK && form.SelectedEntity != null)
                {
                    // determine the schema
                    DocSchema targetschema = null;
                    foreach(DocSection docSection in this.m_project.Sections)
                    {
                        foreach(DocSchema docSchema in docSection.Schemas)
                        {
                            if(form.SelectedEntity is DocEntity && docSchema.Entities.Contains((DocEntity)form.SelectedEntity) ||
                                form.SelectedEntity is DocType && docSchema.Types.Contains((DocType)form.SelectedEntity))
                            {
                                targetschema = docSchema;
                                break;
                            }
                        }
                    }

                    if (targetschema == null)
                    {
                        return;
                    }

                    DocSchema sourceschema = (DocSchema)this.treeView.SelectedNode.Tag;
                    if(sourceschema == targetschema)
                    {
                        MessageBox.Show(this, "The selected item is in the current schema; references may only be made to definitions from other schemas.", "Reference");
                        return;
                    }

                    // check for schema reference
                    DocSchemaRef targetschemaref = null;
                    TreeNode tnTargetSchema = null;
                    foreach (DocSchemaRef docSchemaRef in sourceschema.SchemaRefs)
                    {
                        if(docSchemaRef.Name != null && docSchemaRef.Name.Equals(targetschema.Name, StringComparison.OrdinalIgnoreCase))
                        {
                            // found it
                            targetschemaref = docSchemaRef;

                            int index = sourceschema.SchemaRefs.IndexOf(docSchemaRef);
                            tnTargetSchema = this.treeView.SelectedNode.Nodes[6].Nodes[index];
                            break;
                        }
                    }

                    if (targetschemaref == null)
                    {
                        targetschemaref = new DocSchemaRef();
                        targetschemaref.Name = targetschema.Name.ToUpper();
                        sourceschema.SchemaRefs.Add(targetschemaref);
                        tnTargetSchema = LoadNode(this.treeView.SelectedNode.Nodes[6], targetschemaref, targetschemaref.Name, false);
                    }

                    // add definition reference
                    DocDefinitionRef targetdef = null;
                    foreach(DocDefinitionRef docDefRef in targetschemaref.Definitions)
                    {
                        if(docDefRef.Name.Equals(form.SelectedEntity.Name))
                        {
                            targetdef = docDefRef;
                            break;
                        }
                    }

                    if(targetdef != null)
                    {
                        // select it...
                        MessageBox.Show(this, "The selected item has already been referenced in this schema.");
                        return;
                    }

                    targetdef = new DocDefinitionRef();
                    targetdef.Name = form.SelectedEntity.Name;
                    InitDefinition(targetdef);
                    targetschemaref.Definitions.Add(targetdef);
                    TreeNode tnTargetDef = LoadNode(tnTargetSchema, targetdef, targetdef.Name, false);

                    this.treeView.SelectedNode = tnTargetDef;
                }
            }
        }