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c#multithreadingasynchronouscultureinfo.net-4.6
1408786user
1408786user

Reputation: 2014

Async Thread.CurrentThread.CurrentCulture in .net-4.6

Because of the following information from microsoft, I updated my code a bit. It sounds like they updated the currentculture to something I could use.

For apps that target the .NET Framework 4.6 and later versions, CultureInfo.CurrentCulture and CultureInfo.CurrentUICulture are stored in a thread's ExecutionContext, which flows across asynchronous operations. (source: https://msdn.microsoft.com/en-us/library/dn833123(v=vs.110).aspx)

using System;
using System.Globalization;
using System.Threading;
using System.Threading.Tasks;

class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine("start " + Thread.CurrentThread.CurrentCulture.ToString() + " " + Thread.CurrentThread.ManagedThreadId);
        RunAsync().Wait();
        Console.WriteLine("Finish " + Thread.CurrentThread.CurrentCulture.ToString() + " " + Thread.CurrentThread.ManagedThreadId);
        Console.ReadKey();
    }

    static async Task RunAsync()
    {
        Thread.CurrentThread.CurrentCulture = new System.Globalization.CultureInfo("de-DE");

        Console.WriteLine("1 " + Thread.CurrentThread.CurrentCulture.ToString() + " " + Thread.CurrentThread.ManagedThreadId);
        string cultureInTask = string.Empty;

        await Task.Run(() => cultureInTask = Thread.CurrentThread.CurrentCulture.ToString() + " " + Thread.CurrentThread.ManagedThreadId).ConfigureAwait(true);

        Console.WriteLine("2 " + cultureInTask);
        string twoA = await TestMethodAsync();
        Console.WriteLine("2a " + twoA + " " + Thread.CurrentThread.ManagedThreadId);
        Console.WriteLine("3 " + Thread.CurrentThread.CurrentCulture.ToString() + " " + Thread.CurrentThread.ManagedThreadId);            
    }

    public static async Task<string> TestMethodAsync()
    {
        Console.WriteLine("2s " + Thread.CurrentThread.CurrentCulture.ToString() + " " + Thread.CurrentThread.ManagedThreadId);
        return await Task.Run(() =>
        {
            return System.Threading.Thread.CurrentThread.CurrentUICulture.ToString() + " " + Thread.CurrentThread.ManagedThreadId;
        });
    }
}

Output: 

start en-US 1
1 de-DE 1
2 de-DE 3
2s de-DE 3
2a en-US 4 4
3 de-DE 4
Finish en-US 1

But why is 2a returning en-US and not de-DE? Is it because the executionContext is different? If so, how can I stay in the same execution context?

Upvotes: 3

Views: 1248

Answers (1)

Jon Skeet
Jon Skeet

Reputation: 1500165

CurrentCulture and CurrentUICulture are independent properties. You're only setting CurrentCulture, and you're reporting that everywhere except for 2a, which reports CurrentUICulture. If you use the same property consistently throughout the code (either property should be fine), it'll give you the expected results.

Upvotes: 2

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