ASP.NET核心选项模式

Question

我正在尝试使用此处描述的选项模式，但我希望能够获得比键/值对更复杂的东西。

理想情况下，我希望能够使用Paste JSON as Classes来复制我的appsettings.json，然后将根类交给services.Configure<T>(Configuration)并完成它。

这就是我所做的：

appsettings.json：

{
  "Data": {
    "ConnectionA": {
      "ConnectionString": "string1"
    },
    "ConnectionB": {
      "ConnectionString": "string2"
    }
  }
}

相应的课程

public class Data
{
    public Connectiona ConnectionA { get; set; }
    public Connectionb ConnectionB { get; set; }
}

public class Connectiona
{
    public string ConnectionString { get; set; }
}

public class Connectionb
{
    public string ConnectionString { get; set; }
}

startup.cs

services.Configure<Data>(Configuration);

这会返回ConnectionA和ConnectionB null对象。

有什么建议么？

每个请求完全startup.cs：

    public Startup(IHostingEnvironment env)
    {
        var builder = new ConfigurationBuilder()
            .SetBasePath(env.ContentRootPath)
            .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
            .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
            .AddEnvironmentVariables();

        Configuration = builder.Build();
    }

    public IConfigurationRoot Configuration { get; }

    // This method gets called by the runtime. Use this method to add services to the container.
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddOptions();
        services.Configure<Data>(Configuration);

        // Add framework services.
        services.AddMvc();
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
    {
        loggerFactory.AddConsole(Configuration.GetSection("Logging"));
        loggerFactory.AddDebug();

        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
            app.UseBrowserLink();
        }
        else
        {
            app.UseExceptionHandler("/Home/Error");
        }

        app.UseStaticFiles();
        app.UseMvc(routes =>
        {
            routes.MapRoute(
                name: "default",
                template: "{controller=User}/{action=Index}/{id?}");
        });
    }

编辑 ：

这有效：

services.Configure<Data>(options => {
    options.Connectiona = new Connectiona();
    options.Connectiona = new Connectionb();
    options.Connectiona.ConnectionString = Configuration["Data:Connectiona:ConnectionString"];
    options.Connectionb.ConnectionString = Configuration["Data:Connectionb:ConnectionString"];
});

所以看起来我只是不能使用services.Configure<Data>(Configuration)扩展。

Answer 1

尝试services.Configure<Data>(Configuration.GetSection("Data")); 而不是services.Configure<Data>(Configuration);

Answer 2

试试这样：

{
  "Data": {
    "DataWarehouseConnection": {
      "ConnectionString": "yourconnectionstringhere"
    },
    "DefaultConnection ": {
      "ConnectionString": "yourconnectionstringhere"
    }
}