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CultureInfo.DefaultThreadCurrentCulture Property

.NET Framework 4.5

Gets or sets the default culture for threads in the current application domain.

Namespace:  System.Globalization
Assembly:  mscorlib (in mscorlib.dll)

public static CultureInfo DefaultThreadCurrentCulture { get; set; }

Property Value

Type: System.Globalization.CultureInfo
The default culture for threads in the current application domain, or null if the current system culture is the default thread culture in the application domain.

In the .NET Framework 4 and previous versions, by default, the culture of all threads is set to the Windows system culture. For applications whose current culture differs from the default system culture, this behavior is often undesirable. In the .NET Framework 4.5, the DefaultThreadCurrentCulture property enables an application to define the default culture of all threads in an application domain.

Important noteImportant

If you have not explicitly set the culture of any existing threads executing in an application domain, setting the DefaultThreadCurrentCulture property also changes the culture of these threads. However, if these threads execute in another application domain, their culture is defined by the DefaultThreadCurrentCulture property in that application domain or, if no default value is defined, by the default system culture. Because of this, we recommend that you always explicitly set the culture of your main application thread, and not rely on the DefaultThreadCurrentCulture property to define the culture of the main application thread.

Unless it is set explicitly, the value of the DefaultThreadCurrentCulture property is null, and the culture of threads in an application domain that have not been assigned an explicit culture is defined by the default Windows system culture.

For more information about cultures, threads, and application domains, see the "Culture and threads" and "Culture and application domains" sections in the CultureInfo reference page.

The following example illustrates the default behavior of the .NET Framework in defining the current culture of a new thread. At startup, the example sets the current culture and the current UI culture to French (France) on all systems except those on which the default system culture is already French (France). If the default system culture is already French (France), the code sets the current culture and the current UI culture to English (United States). It then calls the DisplayRandomNumbers routine, which generates three random numbers and displays them as currency values. Next, it creates a new thread, which also executes the DisplayRandomNumbers routine.

using System;
using System.Globalization;
using System.Text;
using System.Threading;

public class Example
{
   public static void Main()
   {
      Console.OutputEncoding = Encoding.UTF8; 
      // Change current culture
      CultureInfo culture;
      if (Thread.CurrentThread.CurrentCulture.Name == "fr-FR")
         culture = CultureInfo.CreateSpecificCulture("en-US");
      else
         culture = CultureInfo.CreateSpecificCulture("fr-FR");

      Thread.CurrentThread.CurrentCulture = culture;
      Thread.CurrentThread.CurrentUICulture = culture;

      // Generate and display three random numbers on the current thread.
      DisplayRandomNumbers();
      Thread.Sleep(1000);

      Thread workerThread = new Thread(new ThreadStart(Example.DisplayRandomNumbers));
      workerThread.Start();
   }

   private static void DisplayRandomNumbers()
   {
      Console.WriteLine();
      Console.WriteLine("Current Culture:    {0}", 
                        Thread.CurrentThread.CurrentCulture);
      Console.WriteLine("Current UI Culture: {0}", 
                        Thread.CurrentThread.CurrentUICulture);

      Console.Write("Random Values: ");
      Random rand = new Random();
      for (int ctr = 0; ctr <= 2; ctr++)
         Console.Write("     {0:C2}     ", rand.NextDouble());

      Console.WriteLine();
   }
}
// The example displays output similar to the following: 
//    Current Culture:    fr-FR 
//    Current UI Culture: fr-FR 
//    Random Values:      0,77 €          0,35 €          0,52 €      
//     
//    Current Culture:    en-US 
//    Current UI Culture: en-US 
//    Random Values:      $0.30          $0.79          $0.65     

As the output from the example shows, when the example is run on a computer whose system culture is English (United States), the main thread displays its currency values using the formatting conventions of the French (France) culture. However, because the worker thread's culture is derived from the current Windows system culture rather than the application's current culture, the work thread displays its currency values using the formatting conventions of the English (United States) culture.

The following example uses the DefaultThreadCurrentCulture and DefaultThreadCurrentUICulture properties to define the current culture and current UI culture of a new application thread. At startup, the example sets the current culture and the current UI culture to French (France) on all systems except those on which the default system culture is already French (France). If the default system culture is already French (France), it sets the current culture and the current UI culture to English (United States). It then calls the DisplayRandomNumbers routine, which generates three random numbers and displays them as currency values. Next, it creates a new thread, which also executes the DisplayRandomNumbers routine.

using System;
using System.Globalization;
using System.Text;
using System.Threading;

public class Example
{
   public static void Main()
   {
      Console.OutputEncoding = Encoding.UTF8; 
      // Change current culture
      CultureInfo culture;
      if (Thread.CurrentThread.CurrentCulture.Name == "fr-FR")
         culture = CultureInfo.CreateSpecificCulture("en-US");
      else
         culture = CultureInfo.CreateSpecificCulture("fr-FR");

      CultureInfo.DefaultThreadCurrentCulture = culture;
      CultureInfo.DefaultThreadCurrentUICulture = culture;

      Thread.CurrentThread.CurrentCulture = culture;
      Thread.CurrentThread.CurrentUICulture = culture;

      // Generate and display three random numbers on the current thread.
      DisplayRandomNumbers();
      Thread.Sleep(1000);

      Thread workerThread = new Thread(new ThreadStart(Example.DisplayRandomNumbers));
      workerThread.Start();
   }

   private static void DisplayRandomNumbers()
   {
      Console.WriteLine();
      Console.WriteLine("Current Culture:    {0}", 
                        Thread.CurrentThread.CurrentCulture);
      Console.WriteLine("Current UI Culture: {0}", 
                        Thread.CurrentThread.CurrentUICulture);

      Console.Write("Random Values: ");
      Random rand = new Random();
      for (int ctr = 0; ctr <= 2; ctr++)
         Console.Write("     {0:C2}     ", rand.NextDouble());

      Console.WriteLine();
   }
}
// The example displays output similar to the following: 
//    Current Culture:    fr-FR 
//    Current UI Culture: fr-FR 
//    Random Values:      0,78 €          0,80 €          0,37 € 
//     
//    Current Culture:    fr-FR 
//    Current UI Culture: fr-FR 
//    Random Values:      0,52 €          0,32 €          0,15 €

As the output from the example shows, when the example is run on a computer whose system culture is English (United States), both the main thread and the worker thread display their currency values using the formatting conventions of the French (France) culture.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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