.Net Core Web应用加载读取Json配置文件

⒈添加Json配置文件并将“复制到输出目录”属性设置为“始终复制”

1 {
2   "Logging": {
3     "LogLevel": {
4       "Default": "Warning"
5     }
6   },
7   "AllowedHosts": "*"
8 }

1 {
2   "ConnectionStrings": {
3     "StudyConnStr": "Data Source=.;Initial Catalog=Study;User ID=sa;Password=admin"
4   }
5 }

⒉在Program中加载配置文件

 1 using System;
 2 using System.Collections.Generic;
 3 using System.IO;
 4 using System.Linq;
 5 using System.Threading.Tasks;
 6 using Microsoft.AspNetCore;
 7 using Microsoft.AspNetCore.Hosting;
 8 using Microsoft.Extensions.Configuration;
 9 using Microsoft.Extensions.Logging;
10 
11 namespace EF_SqlServer
12 {
13     public class Program
14     {
15         public static void Main(string[] args)
16         {
17             CreateWebHostBuilder(args).Build().Run();
18 
19         }
20 
21         public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
22             WebHost.CreateDefaultBuilder(args)
23             .ConfigureAppConfiguration((hostingContext, config) =>
24             {
25                 config.SetBasePath(Directory.GetCurrentDirectory());
26                 config.AddJsonFile("//Config//dbconfig.json", true, true);
27                 config.AddJsonFile("appsettings.json", true, true);
28             }).UseStartup<Startup>();
29     }
30 }

⒊使用配置文件中的相关属性

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Threading.Tasks;
 5 using Microsoft.AspNetCore.Builder;
 6 using Microsoft.AspNetCore.Hosting;
 7 using Microsoft.AspNetCore.Http;
 8 using Microsoft.AspNetCore.HttpsPolicy;
 9 using Microsoft.AspNetCore.Mvc;
10 using Microsoft.Extensions.Configuration;
11 using Microsoft.Extensions.DependencyInjection;
12 
13 namespace EF_SqlServer
14 {
15     public class Startup
16     {
17         public Startup(IConfiguration configuration)
18         {
19             Configuration = configuration;
20         }
21 
22         public IConfiguration Configuration { get; }
23 
24         // This method gets called by the runtime. Use this method to add services to the container.
25         public void ConfigureServices(IServiceCollection services)
26         {
27             services.Configure<CookiePolicyOptions>(options =>
28             {
29                 // This lambda determines whether user consent for non-essential cookies is needed for a given request.
30                 options.CheckConsentNeeded = context => true;
31                 options.MinimumSameSitePolicy = SameSiteMode.None;
32             });
33             string dbConn = Configuration.GetSection("ConnectionStrings").GetSection("StudyConnStr").Value;
34             string logDef = Configuration["Logging:LogLevel:Default"];
35             services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
36         }
37 
38         // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
39         public void Configure(IApplicationBuilder app, IHostingEnvironment env)
40         {
41             if (env.IsDevelopment())
42             {
43                 app.UseDeveloperExceptionPage();
44             }
45             else
46             {
47                 app.UseExceptionHandler("/Home/Error");
48                 // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
49                 app.UseHsts();
50             }
51 
52             app.UseHttpsRedirection();
53             app.UseStaticFiles();
54             app.UseCookiePolicy();
55 
56             app.UseMvc(routes =>
57             {
58                 routes.MapRoute(
59                     name: "default",
60                     template: "{controller=Home}/{action=Index}/{id?}");
61             });
62         }
63     }
64 }