QueryStringRequestCultureProvider Does Not Work With Blazor Server

[taoyouh]

Describe the bug

When using QueryStringRequestCultureProvider on Blazor Server, the culture immediately changes from the one given in query string to the one set in HTTP headers.

To Reproduce

// Startup.cs
app.UseRequestLocalization("zh-CN", "en");

// Index.razor
@CultureInfo.CurrentCulture.TextInfo

Launch the app with URL http://localhost:xxx/?culture=zh-CN. The page displays "zh-CN" for less than 1 second and changes to "en"

Further technical details

Version of .NET Core SDK:

 Version:   3.1.200
 Commit:    c5123d973b

运行时环境:
 OS Name:     Windows
 OS Version:  10.0.18363
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\3.1.200\

Host (useful for support):
  Version: 3.1.2
  Commit:  916b5cba26

.NET Core SDKs installed:
  2.1.508 [C:\Program Files\dotnet\sdk]
  2.1.509 [C:\Program Files\dotnet\sdk]
  2.1.801 [C:\Program Files\dotnet\sdk]
  3.1.200 [C:\Program Files\dotnet\sdk]

.NET Core runtimes installed:
  Microsoft.AspNetCore.All 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.13 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.16 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.13 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.16 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.13 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.16 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.2 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 3.1.2 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

To install additional .NET Core runtimes or SDKs:
  https://aka.ms/dotnet-download

IDE: Visual Studio 16.5.0

[javiercn]

@taoyouh thanks for contacting us.

This is likely due to the url used to establish the connection with server-side Blazor.

@rynowak do you have any thoughts around this?

@SteveSandersonMS We could consider tackling query string parameters when we setup the connection to the hub so that things like this would possibly work. Do you have any opinions?

[mkArtakMSFT]

@anurse how does query string localization work in SignalR?

[analogrelay]

SignalR doesn’t do anything with it. Any culture information on the HttpContext when it reaches SignalR should be preserved.

[javiercn]

@anurse do you have any docs or thoughts on how to do this E2E for SignalR applications?

[analogrelay]

Nope. It’s not something we’ve really thought about.

[AlexTeixeira]

Hi,

Same here. For info, If I debug the GetString Method, the correct culture is displayed.