c# - 开拓者。如何在 Startup 类(方法 ConfigureServices)中获取当前 url？

Question

我正在使用 AspNetCore.Identity.LiteDB。数据库名称取决于主机名。我正在尝试使用 NavigationManager 获取主机名，但它似乎在 Startup.ConfigureServices 中未初始化。

public void ConfigureServices(IServiceCollection services)
    {
       // Server Side Blazor doesn't register HttpClient by default
        if (!services.Any(x => x.ServiceType == typeof(HttpClient)))
        {
            // Setup HttpClient for server side in a client side compatible fashion
            services.AddScoped<HttpClient>(s =>
            {
                NavigationManager uriHelper = s.GetRequiredService<NavigationManager>();
                return new HttpClient
                {
                    BaseAddress = new Uri(uriHelper.BaseUri)
                };
            });
        }

        services.AddRazorPages();
        services.AddServerSideBlazor();
        services.AddTransient<ILiteDbContext>(s =>
                {
                    NavigationManager uriHelper = s.GetRequiredService<NavigationManager>();
                    Uri currentUrl= uriHelper.ToAbsoluteUri(uriHelper.BaseUri);
                    return new LiteDbContext(new LiteDatabase(this.GetUserDatabasePath(currentUrl)));
                }
            );

        //services.AddTransient<ILiteDbContext, LiteDbContext>();
        services.AddIdentity<ApplicationUser, AspNetCore.Identity.LiteDB.IdentityRole>(options =>
        {
            options.Password.RequireDigit = false;
            options.Password.RequireUppercase = false;
            options.Password.RequireLowercase = false;
            options.Password.RequireNonAlphanumeric = false;
            options.Password.RequiredLength = 6;
        })
        .AddUserStore<LiteDbUserStore<ApplicationUser>>()
        .AddRoleStore<LiteDbRoleStore<AspNetCore.Identity.LiteDB.IdentityRole>>()
        .AddDefaultTokenProviders();

我有一个异常(exception):InvalidOperationException:“RemoteNavigationManager”尚未初始化。

据我了解，NavigationManager 在初始化 Identity 时未初始化。有没有办法在没有 NavigationManager 的情况下获取当前 URL？

Answer 1

这是 Blazor 服务器端还是 Blazor 客户端？
如果是客户端，您可以使用 IWebAssemblyHostEnvironment 接口(interface)获取应用程序的 BaseAddress。您可以在 CSB Program.cs

中执行类似的操作

private static void ConfigureServices(IServiceCollection services, IWebAssemblyHostEnvironment hostEnvironment)
{
    var baseAddress = hostEnvironment.BaseAddress;
    // Do your stuff
}