File encoding is not maintained when first line of file is a conditional statement

The file generated after doing dotnet new has a different encoding than what was in the original file for the template.

Repro:

• Install dotnet 3.1 sdk
• Unzip C:\Program Files\dotnet\templates\3.1.0\microsoft.dotnet.web.projecttemplates.3.1.3.1.0.nupkg and go to Web.ProjectTemplates/content/BlazorServerWeb-Csharp/
• Verify the encoding of App.razor (It should be UTF-8 with BOM)
• Now create a new app with dotnet new blazor
• Open the generated App.razor and check its encoding

Expected: UTF-8 with BOM

Actual: Windows Codepage 1252

cc @phenning

[pranavkm]

Thanks for fixing the issue @grinrag. Do you know what version of the .NET Core SDK this fix would appear in?

[phenning]

This looks like a bug when the first line of the processed file contains a conditional construct such as #if.

I just verified that either adding a blank line to the top of the file, or moving the #if to the next line as follows results in the encoding being preserved.

@*
#if (NoAuth)
<Router AppAssembly="@typeof(Program).Assembly">

@ajaybhargavb This could be used as a a workaround in the template content until the root cause of underlying bug is found and fixed.