How to make a program that only loads the window but doesn't show it, and doesn't block the code?

[vitash]

I'm developing with Blazor, and for the Windows platform, my program need COM call, and I don't want it to block subsequent code, I want the window to be there and not take focus.
The following code causes my method to block:

PhotinoBlazorApp.Run();
// The code is blocked.

I tried looking for the method in PhotinoBlazorApp.MainWindow and couldn't find a match.
I'm trying to find ways to just load the window without blocking the code.

[MikeYeager]

@vitash Why not make your COM call on another thread before opening the window? If we don't block and wait on the windows, they the .NET code will simply run to completion and exit. Otherwise, it would be up to your code to block.

[vitash]

I am using a translation tool to communicate, so there may be some deviations, sorry.
At this time, I wrote a COM A, which is called by another program. The loading window is carried out by a method F in COM A. If method F is blocked, it will affect this program.

[vitash]

I tried running it in a new thread, but the program that called COM crashed.

PhotinoBlazorApp app = BuildWindow();
var t1 = new Thread(() => {

    app.Run();
});
t1.SetApartmentState(ApartmentState.STA);
t1.Start();

[vitash]

Oh yeah, I know the crash problem, because I am in the old thread BuildWindow, if it is in the new thread, it will be fine.

var t1 = new Thread(() => {
    PhotinoBlazorApp app = BuildWindow();
    app.Run();
});
t1.SetApartmentState(ApartmentState.STA);
t1.Start();