将配置作为服务asp.net核心访问-Java 学习之路

我试图在我的ASP.NET核心WebAPI中访问AppSettings作为服务 . 当我执行Configuration.GetSection（“AppSettings”）时，我得到null，但我可以访问配置值为Configuration [“AppSettings：StorageConnectionKey：AccountName”] . 我不确定我做错了什么 .

我的Startup.cs如下所示

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Library;

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

        public IConfiguration Configuration { get; set; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            // Add framework services.
            services.AddMvc();

            services.AddOptions();


            services.Configure<AppSettings>(options => Configuration.GetSection("AppSettings"));

            // *If* you need access to generic IConfiguration this is **required**
            services.AddSingleton<IConfiguration>(Configuration);
        }

        // 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();

            app.UseMvc();
        }
    }
}

我的appsetting是

{
  "AppSettings": {
    "StorageConnectionKey": {
      "AccountName": "myaccountName",
      "AccountKey": "abc"

    },
    "CloudContainerkey": {
      "ContainerName": "mycontainername",
      "FileName": "db.dat"
    }
  },
  "Logging": {
    "IncludeScopes": false,
    "LogLevel": {
      "Default": "Warning"
    }
  }
}

我有一个图书馆项目，我有所需的课程

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Library
{
    public class AppSettings
    {
        public StorageConnectionKey storageKey {get; set; }
        public CloudContainerKey containerKey { get; set; }
    }
}

    namespace Library
{
    public class CloudContainerKey
    {
        public string ContainerName { get; set; }
        public string FileName { get; set; }
    }
}

    namespace Library
{
    public class StorageConnectionKey
    {
        public string AccountName { get; set; }
        public string AccountKey { get; set; }
    }
}

我试图把它作为控制器

public class ValuesController : Controller
    {
        private readonly AppSettings _appSettings;

        public ValuesController(IOptions<AppSettings> settings)
        {
            _appSettings = settings.Value;
        }
}

任何帮助在这里表示赞赏 .

2 回答

要使用IConfiguration实例设置AppSettings，请使用：

services.Configure<AppSettings>(Configuration.GetSection("AppSettings"));

此外，您需要使用相同的属性名称作为设置参数 . 将 AppSettings 修改为：

public class AppSettings
{
    public StorageConnectionKey StorageConnectionKey {get; set; }
    public CloudContainerKey CloudContainerKey { get; set; }
}

在您的情况下，在使用扩展方法时，您具有null，允许手动注册用于配置选项的操作 . 如果查看方法定义，您将看到：

//
// Summary:
//     Registers an action used to configure a particular type of options. ///
//
// Parameters:
//   services:
//     The Microsoft.Extensions.DependencyInjection.IServiceCollection to add the services
//     to.
//
//   configureOptions:
//     The action used to configure the options.
//
// Type parameters:
//   TOptions:
//     The options type to be configured.
//
// Returns:
//     The Microsoft.Extensions.DependencyInjection.IServiceCollection so that additional
//     calls can be chained.
public static IServiceCollection Configure<TOptions>(this IServiceCollection services,
     Action<TOptions> configureOptions) where TOptions : class;

换句话说，当您使用follow代码时，您注册lambda函数并已使用 AppSettings 的实例：

services.Configure<AppSettings>(option =>
{
    // option here is the AppSettings and so we can override value like:
    option.StorageConnectionKey = "some_new_value";
});

回复于 2024-04-29T01:16:07+08:00

我想它应该是这样的：

services.Configure<AppSettings>(Configuration.GetSection("AppSettings"));

回复于 2024-04-29T01:16:07+08:00

将配置作为服务asp.net核心访问

2 回答

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