ASP.NET Core 6 MVC：如何从 controller 访问 Program.cs 中定义的变量值？

Question

I have created an ASP.NET Core 6 MVC application & I created a variable in my Program.cs file and assigned it a random UUID value.

I then use that variable as part of several endpoint routing patterns, also defined in my Program.cs file.

My question is, if I need to access that same variable and its UUID value from within my controller file, how do I go about doing that?

I've tried researching how to create global variables & accessing them between .NET files - but none of those techniques seem to work for ASP.NET Core MVC application.

Here is a code snippet from my Program.cs file that shows the created variable ( uuid1 ) and how it is used in some of the endpoints route patterns I would like to be able to access the variable uuid1 from within my HomeController . Thanks in advance.

app.UseEndpoints(endpoints =>
{
    Guid uuidi = Guid.NewGuid();
    string uuid1 = uuidi.ToString();
    Console.WriteLine("UUID: " + uuid1);
    endpoints.MapControllerRoute(name: "views",
        pattern: uuid1,
        defaults: new { controller = "Home", action = "Index" });
    
    endpoints.MapControllerRoute(name: "views",
        pattern: "/" + uuid1 + "/exit/",
        defaults: new { controller = "Home", action = "Submitted" });
                
    endpoints.MapGet("/uuid", async context =>
    {
        await context.Response.WriteAsync(uuid1);
    });

Answer 1

According to your description, I suggest you could try to write a class which store the value and register it as Singleton service.

Then you could use it inside the controller.

More details, you could refer to below codes:

Class:

public class ChannelOptions
{
    public string? ChannelId { get; set; }
}

Program.cs

Guid uuidi = Guid.NewGuid();
string uuid1 = uuidi.ToString();
builder.Services.AddSingleton(new ChannelOptions { ChannelId = uuid1 });

Controller:

public class HomeController : Controller
{
    private readonly ILogger<HomeController> _logger;
    private readonly ChannelOptions options1;

    public HomeController(ILogger<HomeController> logger, ChannelOptions options)
    {
        _logger = logger;
        options1 = options;
    }

    public IActionResult Index()
    {
        var re = options1.ChannelId;
        return View();
    }

Result: