Description:
Bootstrapping in .Net (tested with .Net 6) fails, whereas bootstrapping in .Net Framework (tested with .Net Framework 4.8) succeeds.


Consider this C# code:


static int Main()
{
    string programPath = GetProgramPath();

    System.Environment.SetEnvironmentVariable(
        "UNO_PATH",
        programPath,
        System.EnvironmentVariableTarget.Process
    );
    System.Environment.SetEnvironmentVariable(
        "URE_BOOTSTRAP",
        $"vnd.sun.star.pathname:{System.IO.Path.Combine(programPath, "fundamental.ini")}",
        System.EnvironmentVariableTarget.Process
    );
    System.Environment.SetEnvironmentVariable(
        "PATH",
        $"{programPath}{System.IO.Path.PathSeparator}{System.Environment.GetEnvironmentVariable("PATH")}",
        System.EnvironmentVariableTarget.Process
    );
    try
    {
        uno.util.Bootstrap.defaultBootstrap_InitialComponentContext();
        System.Console.Out.WriteLine("OK!");
        return 0;
    }
    catch (System.Exception x)
    {
        System.Console.Error.WriteLine(x.GetType().FullName);
        System.Console.Error.WriteLine(x.Message);
        System.Console.Error.WriteLine(x.StackTrace);
        return 1;
    }
}
static string GetProgramPath()
{
    var programPath = Microsoft.Win32.Registry.GetValue(
        Microsoft.Win32.Registry.LocalMachine.Name + @"\SOFTWARE\LibreOffice\UNO\InstallPath",
        "",
        null
    ) as string;
    if (string.IsNullOrEmpty(programPath))
    {
        throw new System.Exception("Failed to detect the program path");
    }
    return programPath;
}


When executed with .Net Framework 4.8 everything works just fine.

When executed with .Net 6 we have:

System.InvalidOperationException
Handle is not initialized.
   at System.Runtime.InteropServices.GCHandle.FromIntPtr(IntPtr value)
   at uno.util.to_cli<class com::sun::star::uno::XComponentContext>(Reference<com::sun::star::uno::XComponentContext>* x)
   at uno.util.Bootstrap.defaultBootstrap_InitialComponentContext(String ini_file, IDictionaryEnumerator bootstrap_parameters)
   at uno.util.Bootstrap.defaultBootstrap_InitialComponentContext()
   at ConsoleDotNetFramework.Program.Main() in Program.cs:line 26


I tested it with LibreOffice 7.3.1.3 and with a fresh built of master (as of 2022-03-28): same results.
I also tested it in a Windows Sandbox: same results.



Steps to Reproduce:
1. Create a .Net (not .Net Framework) project
2. Add references to the DLLs that come with the SDK
3. Call uno.util.Bootstrap.defaultBootstrap_InitialComponentContext();

Actual Results:
defaultBootstrap_InitialComponentContext throws a System.InvalidOperationException exception:

Message: Handle is not initialized.
Stack trace:
   at System.Runtime.InteropServices.GCHandle.FromIntPtr(IntPtr value)
   at uno.util.to_cli<class com::sun::star::uno::XComponentContext>(Reference<com::sun::star::uno::XComponentContext>* x)
   at uno.util.Bootstrap.defaultBootstrap_InitialComponentContext(String ini_file, IDictionaryEnumerator bootstrap_parameters)
   at uno.util.Bootstrap.defaultBootstrap_InitialComponentContext()


Expected Results:
defaultBootstrap_InitialComponentContext should return a unoidl.com.sun.star.uno.XComponentContext instance without throwing an exception.


Reproducible: Always


User Profile Reset: Yes



Additional Info:
I published a simple Visual Studio solution to showcase this: see https://github.com/mlocati/libreoffice-uno-dotnet

The .Net project fails, the .NetFramework project succeeds (with exactly the same code)