Blazor MAUI: Controls in BlazorWebView use the device's culture and not an application configured culture

[pranavkm]

Description

Follow up to #2532. If an app configures a culture other than the device's default, Blazor uses it for binding, parsing and localization. However, the UI controls within the web view continue to use the device default culture.

Steps to Reproduce

1. File -> New .NET MAUI Blazor app
2. Update MauiProgram.cs to configure a culture e.g. CultureInfo.CurrentCulture = CultureInfo.CurrentUICulture = new CultureInfo("fr-FR");
3. Add a date input field:

Input: input type="date" @bind="dateTime" />
Bound: @dateTime

Expected: The input appears using French localization
Actual: The bound value uses the French locale, but the input uses the device's culture.

Version with bug

Preview 12 (current)

Last version that worked well

Unknown/Other

Affected platforms

Android

Affected platform versions

n/a

Did you find any workaround?

No response

Relevant log output

No response

[pranavkm]

Resolving this. Using DefaultThreadCurrentCulture instead of CurrentCulture does the right thing. My guess is that the WebView component is rendered from a different context and configuring CurrentCulture is not sufficient as it does not flow across Thread / async boundaries.