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Factory/Singleton pattern in Azure Functions
public class StartUpWork {
private static StartUpWork _singleton;
private string initializeOnce;
public StartUpWork() {
// Do long startup tasks/create database connection pools/whatever you want to happen once
this.initializeOnce = "Woooooo!";
public static StartUpWork ensureStartUp() {
if(StartUpWork._singleton == null) {
StartUpWork._singleton = new StartUpWork();
return StartUpWork._singleton;
public static void Run(HttpWebRequest req) {
// Do the rest of your thing/access properties on StartUpWork
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