How to use the nethereum-codegen.generateNetStandardClassLibrary function in nethereum-codegen

if (settings.projectPath !== undefined) {
                    projectPath = path.join(projectPath, settings.projectPath);
                }
            }
            const outputPathInfo = path.parse(fileName);
            const contractName = outputPathInfo.name;

            const compilationOutput = JSON.parse(fs.readFileSync(fileName, 'utf8'));
            if (compilationOutput.abi !== undefined) {
                const abi = JSON.stringify(compilationOutput.abi);
                const contractByteCode = compilationOutput.bytecode;
                const projectFullPath = path.join(projectPath, projectName + extension);

                if (!fs.existsSync(projectFullPath)) {
                    codegen.generateNetStandardClassLibrary(projectName, projectPath, lang);
                }

                codegen.generateAllClasses(abi,
                    contractByteCode,
                    contractName,
                    baseNamespace,
                    projectPath,
                    lang);
            }
        } catch (e) {
            const outputChannel = vscode.window.createOutputChannel('solidity code generation');
            outputChannel.clear();
            outputChannel.appendLine('Error generating code:');
            outputChannel.appendLine(e.message);
            outputChannel.show();
        }