从控制器(asp.net核心应用程序)重新加载配置

时间:2019-11-05 15:11:33

标签: c# asp.net-core .net-core asp.net-core-2.2 .net-core-2.2

在我的.net core mvc(2.2)应用程序中,我有一个配置,是从数据库配置的。例如,在更改数据库中的某些值之后,如何从控制器重新加载配置?我已经尝试过类似的方法,但是它不起作用:

MyConfiguration.cs:

public class MyConfiguration
{
    public string SmtpServer {get;set;}
}

Startup.cs:

public class Startup
{
    public IConfiguration Configuration { get; }

    public void ConfigureServices(IServiceCollection services)
    {
        services.Configure<MyConfiguration>(options => {
            options.SmtpServer = Configuration["SmtpServer"];
        });

        // ...

        services.AddSingleton<IConfiguration>(Configuration); 
    }
}

Program.cs:

public class Program
{
    public static void Main(string[] args)
    {
        CreateWebHostBuilder(args).Build().Run();
    }

    public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
        WebHost
            .CreateDefaultBuilder(args)  
            .ConfigureAppConfiguration((hostingContext, config) =>
            {
                config.SetBasePath(Directory.GetCurrentDirectory());
                config.AddJsonFile("appsettings.json", optional: false, reloadOnChange: true);                     
                config.AddEFConfiguration(options => options.UseNpgsql("connection_string"));
                config.AddCommandLine(args);
            })
            .UseStartup<Startup>();
}

控制器:

public class TestController : ControllerBase
{
    private readonly IConfigurationRoot _configurationRoot;

    public TestController(IConfiguration configurationRoot)
    { 
        _configurationRoot = (IConfigurationRoot)configurationRoot;    
    } 

    [HttpGet] 
    public async Task<IActionResult> Index()
    { 
        // some logic for updating values in the database

        // Doesn't work
        _configurationRoot.Reload();

        return Ok();
    }
}

0 个答案:

没有答案