.net core 学习小结之 配置介绍（config）以及热更新

• 命令行的配置

   var settings = new Dictionary<string, string>{
                  { "name","cyao"},
                  {"age","18"}
              };
              var builder = new ConfigurationBuilder()
              .AddInMemoryCollection(settings)内存中获取appsettings
              .AddCommandLine(args);
              var configuration = builder.Build();
              Console.WriteLine($"name:{configuration["name"]}"); 
              Console.WriteLine($"age:{configuration["age"]}");
              Console.ReadLine();
              Console.ReadKey();

• json文件的配置

  首先新建一个class.json的配置文件
  {
    "classNo": "1",
    "gread": "1",
    "student": [
      {
        "name": "cyao",
        "age": 18
      },
      {
        "name": "jaya",
        "age": 19
      }
    ]
  }
  

  　　然后在configuration中注册

 var builder = new ConfigurationBuilder()
                .AddJsonFile("class.json")//json文件中获取appsettings
            //.AddInMemoryCollection(settings)内存中获取appsettings
            .AddCommandLine(args);
            var configuration = builder.Build();
            Console.WriteLine($"classNo:{configuration["classNo"]}");
            Console.WriteLine($"gread:{configuration["gread"]}");
            Console.WriteLine($"name:{configuration["student:0:name"]}");
            Console.WriteLine($"age:{configuration["student:0:age"]}");
            Console.WriteLine($"name:{configuration["student:1:name"]}");
            Console.WriteLine($"age:{configuration["student:1:age"]}");
            Console.ReadLine();
            Console.ReadKey();

• 从配置文件文本到C#对象实例的映射-option与Bind

  namespace JwtAuth
  {
      public class JwtSettings
      {
          ///使用者
          public string Issuer { get; set; }
          ///颁发者
          public string Audience { get; set; }
          ///秘钥必须大于16个字符
          public string SecretKey { get; set; }
      }
  
  }

  json文件格式如下
  {
    "Logging": {
      "IncludeScopes": false,
      "Debug": {
        "LogLevel": {
          "Default": "Warning"
        }
      },
      "Console": {
        "LogLevel": {
          "Default": "Warning"
        }
      }
    },
    "JwtSettings": {
      "Issuer": "http://locahost:5000",
      "Audience": "http://locahost:5000",
      "SecretKey": "hello world this is my key for cyao"
    }
  }

  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 Microsoft.Extensions.Options;
  
  namespace JwtAuth
  {
      using Microsoft.AspNetCore.Authentication.JwtBearer;
      using Microsoft.AspNetCore.Authorization;
      using Microsoft.IdentityModel.Tokens;
  
      public class Startup
      {
          public Startup(IConfiguration configuration)
          {
              Configuration = configuration;
          }
  
          public IConfiguration Configuration { get; }
  
          // This method gets called by the runtime. Use this method to add services to the container.
          public void ConfigureServices(IServiceCollection services)
          {
              //将配置文件读取到settings
              services.Configure<JwtSettings>(Configuration.GetSection("JwtSettings"));
              JwtSettings settings = new JwtSettings();
              Configuration.Bind("JwtSettings", settings);
              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)
          {
              if (env.IsDevelopment())
              {
                  app.UseDeveloperExceptionPage();
              }
              app.UseMvc();
          }
      }
  }

• 配置文件热更新

    <ItemGroup>
      <DotNetCliToolReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Tools" Version="2.0.3"/>
      <DotNetCliToolReference Include="Microsoft.DotNet.Watcher.Tools" Version="2.0.0"/>
    </ItemGroup>

• 框架设计：Configuration