Description
Issue moved from dotnet/docs#22107
- Please respond to @vernou.
From @vernou on Monday, December 21, 2020 8:55:29 AM
Description
In the documentation of the class CultureInfo at the chapter Culture and threads, it has this example :
using System;
using System.Globalization;
using System.Threading;
public class Example
{
static Random rnd = new Random();
public static void Main()
{
if (Thread.CurrentThread.CurrentCulture.Name != "fr-FR") {
// If current culture is not fr-FR, set culture to fr-FR.
Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture("fr-FR");
Thread.CurrentThread.CurrentUICulture = CultureInfo.CreateSpecificCulture("fr-FR");
}
else {
// Set culture to en-US.
Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture("en-US");
Thread.CurrentThread.CurrentUICulture = CultureInfo.CreateSpecificCulture("en-US");
}
ThreadProc();
Thread worker = new Thread(ThreadProc);
worker.Name = "WorkerThread";
worker.Start();
}
private static void DisplayThreadInfo()
{
Console.WriteLine("\nCurrent Thread Name: '{0}'",
Thread.CurrentThread.Name);
Console.WriteLine("Current Thread Culture/UI Culture: {0}/{1}",
Thread.CurrentThread.CurrentCulture.Name,
Thread.CurrentThread.CurrentUICulture.Name);
}
private static void DisplayValues()
{
// Create new thread and display three random numbers.
Console.WriteLine("Some currency values:");
for (int ctr = 0; ctr <= 3; ctr++)
Console.WriteLine(" {0:C2}", rnd.NextDouble() * 10);
}
private static void ThreadProc()
{
DisplayThreadInfo();
DisplayValues();
}
}
// The example displays output similar to the following:
// Current Thread Name: ''
// Current Thread Culture/UI Culture: fr-FR/fr-FR
// Some currency values:
// 8,11 €
// 1,48 €
// 8,99 €
// 9,04 €
//
// Current Thread Name: 'WorkerThread'
// Current Thread Culture/UI Culture: en-US/en-US
// Some currency values:
// $6.72
// $6.35
// $2.90
// $7.72The starting culture is 'en-US'.
In .NET 4.5, the main thread is set to french culture and the worker thread start with the origin culture.
I get the output show in the example.
But in .NET Core and .NET 4.6 (and above), the two thread are in french culture.
The explication is further in the documentation in chapter Culture and task-based asynchronous operations :
For apps that target the .NET Framework 4.6 or later versions, culture is part of an asynchronous operation's context. In other words, starting with apps that target the .NET Framework 4.6, asynchronous operations by default inherit the values of the CurrentCulture and CurrentUICulture properties of the thread from which they are launched. If the current culture or current UI culture differs from the system culture, the current culture crosses thread boundaries and becomes the current culture of the thread pool thread that is executing an asynchronous operation.
I think this hurt the discovery of .NET to beginner.
Expected
I will expected all default example work with the most recent .NET with sub-chapter to historical behavior.