ASP.NET Core 2.2 - 稍后在代码中访问 StaticFileOption RequestPath

Question

在启动中.cs 配置函数 我做了这样的事情：

        app.UseStaticFiles(new StaticFileOptions()
        {
            FileProvider = new PhysicalFileProvider(@"\serversomepathsomeimages"),
            RequestPath = "/images"
        });

稍后，在控制器中说，我不想硬编码：

        string ImageImLookingFor = "/images" + foo.jpg;

相反，我想做这样的事情：

        string ImageImLookingFor = SomeObjectThatGivesMe.RequestPath + foo.jpg;

这可能吗？

Answer 1

不完全确定是否可能，但解决方法可以是应用程序设置键并从两个位置读取它。

前任：在您的应用中设置中

{
 "ImagesPath" : '/images"
}

在斯塔普.cs

   app.UseStaticFiles(new StaticFileOptions()
    {
        FileProvider = new PhysicalFileProvider(@"\serversomepathsomeimages"),
        RequestPath = Configuration["ImagesPath"]
    });

在你的控制者中

    string ImageImLookingFor = configuration.RequestPath + foo.jpg;

可以将配置文件设置为强类型，并将其替换为IOptions<ImageConfiguration> 其中ImageConfiguration是具有ImagesPath属性的类

Answer 2

您可以尝试使用类似services.Configure配置StaticFileOptions

public class Startup
{
    // This method gets called by the runtime. Use this method to add services to the container.
    public void ConfigureServices(IServiceCollection services)
    {
        services.Configure<StaticFileOptions>(options => {
            options.FileProvider = new PhysicalFileProvider(@"xxx");
            options.RequestPath = "/images";
        });
    }
    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {            
        app.UseStaticFiles(app.ApplicationServices.GetRequiredService<IOptions<StaticFileOptions>>().Value);            
    }
} 

然后通过IOptions<StaticFileOptions>访问它

public class HomeController : Controller
{
    private readonly StaticFileOptions _options;
    public HomeController(IOptions<StaticFileOptions> options)
    {
        this.configuration = configuration;
        _serviceProvider = serviceProvider;
        _options = options.Value;
    }
    public IActionResult Index()
    {
        return Ok(_options.RequestPath);
    }        
}