How to inherit thread culture in parallel block?

Question

I am using automatic globalization on the ASP MVC website. It works fine until it reaches the parallel block:

public ActionResult Index() { // Thread.CurrentThread.CurrentCulture is automatically set to "fr-FR" // according to the requested "Accept-Language" header Parallel.Foreach(ids, id => { // Not every thread in this block has the correct culture. // Some of them still have the default culture "en-GB" }) ; return View() } 

What is the best way to get a parallel block to inherit a culture? besides this solution:

 public ActionResult Index() { var currentCulture = Thread.CurrentThread.CurrentCulture ; Parallel.Foreach(ids, id => { // I don't know if it threadsafe or not. Thread.CurrentThread.CurrentCulture = currentCulture ; }) ; return View() } 

Answer 1

You can create your own Parallel.ForEach thread culture:

 public static class ParallelInheritCulture { public static ParallelLoopResult ForEach<T>(IEnumerable<T> source, Action<T> body) { var parentThreadCulture = Thread.CurrentThread.CurrentCulture; var parentThreadUICulture = Thread.CurrentThread.CurrentUICulture; return Parallel.ForEach(source, e => { var currentCulture = Thread.CurrentThread.CurrentCulture; var currentUICulture = Thread.CurrentThread.CurrentUICulture; try { Thread.CurrentThread.CurrentCulture = parentThreadCulture; Thread.CurrentThread.CurrentUICulture = parentThreadUICulture; body(e); } finally { Thread.CurrentThread.CurrentCulture = currentCulture; Thread.CurrentThread.CurrentUICulture = currentUICulture; } }); } } 

Then:

  ParallelInheritCulture.Foreach(ids, id => { // Whatever }) ;