Skip to content

Latest commit

 

History

History
64 lines (49 loc) · 2.71 KB

currentculture-flows-across-tasks.md

File metadata and controls

64 lines (49 loc) · 2.71 KB
Raw

CurrentCulture and CurrentUICulture flow across tasks

Scope

Minor

Version Introduced

4.6

Version Reverted

4.6.2

Source Analyzer Status

Planned

Change Description

Beginning in the .NET Framework 4.6, xref:System.Globalization.CultureInfo.CurrentCulture?displayProperty=name and xref:System.Globalization.CultureInfo.CurrentUICulture?displayProperty=name are stored in the thread's xref:System.Threading.ExecutionContext?displayProperty=name, which flows across asynchronous operations.

This means that changes to xref:System.Globalization.CultureInfo.CurrentCulture?displayProperty=name or xref:System.Globalization.CultureInfo.CurrentUICulture?displayProperty=name will be reflected in tasks which are later run asynchronously. This is different from the behavior of previous .NET Framework versions (which would reset xref:System.Globalization.CultureInfo.CurrentCulture?displayProperty=name and xref:System.Globalization.CultureInfo.CurrentUICulture?displayProperty=name in all asynchronous tasks).

  • Quirked
  • Build-time break

Recommended Action

Apps affected by this change may work around it by explicitly setting the desired xref:System.Globalization.CultureInfo.CurrentCulture?displayProperty=name or xref:System.Globalization.CultureInfo.CurrentUICulture?displayProperty=name as the first operation in an async Task. Alternatively, the old behavior (of not flowing xref:System.Globalization.CultureInfo.CurrentCulture?displayProperty=name/xref:System.Globalization.CultureInfo.CurrentUICulture?displayProperty=name) may be opted into by setting the following compatibility switch:

AppContext.SetSwitch("Switch.System.Globalization.NoAsyncCurrentCulture", true);

This issue has been fixed by WPF in .NET Framework 4.6.2. It has also been fixed in .NET Frameworks 4.6, 4.6.1 through KB 3139549. Applications targeting .NET Framework 4.6 or later will automatically get the right behavior in WPF applications - xref:System.Globalization.CultureInfo.CurrentCulture?displayProperty=name/xref:System.Globalization.CultureInfo.CurrentUICulture?displayProperty=name) would be preserved across Dispatcher operations.

Affected APIs

  • M:System.Globalization.CultureInfo.set_CurrentCulture(System.Globalization.CultureInfo)
  • M:System.Threading.Thread.set_CurrentCulture(System.Globalization.CultureInfo)
  • M:System.Globalization.CultureInfo.set_CurrentUICulture(System.Globalization.CultureInfo)
  • M:System.Threading.Thread.set_CurrentUICulture(System.Globalization.CultureInfo)

Category

Core

More information