Bind讀取配置到C#實例

1.建立一個空的ASP.NET Core Web 應用程序

2.程序包管理控制檯執行Install-Package Microsoft.AspNetCore -Version 2.0.1

3.建立json文件命名爲：appsettings.json，再添加一個Class類

appsettings.json內容爲：

{
  "ClassNo": "1",
  "ClassDesc": "ASP.NET Core 101",
  "Students": [
    {
      "name": "name1",
      "age": "12"
    },
    {
      "name": "name2",
      "age": "13"
    },
    {
      "name": "name13",
      "age": "14"
    }
  ]
}

Class 類代碼

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

namespace OptionsBindSample
{
    public class Class
    {
        public int ClassNo { get; set; }
        public string ClassDesc { get; set; }
        public List<Student> Students { get; set; }
    }

    public class Student
    {
        public string Name { get; set; }
        public string Age { get; set; }
    }
}

4.Startup.cs 編寫讀取配置構造方法，並在app.Run方法打印，代碼以下

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

namespace OptionsBindSample
{
    public class Startup
    {
        /// <summary>
        /// 添加構造方法用來獲取配置信息
        /// </summary>
        public IConfiguration Configuration { get; set; }
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        // This method gets called by the runtime. Use this method to add services to the container.
        // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
        public void ConfigureServices(IServiceCollection services)
        {
        }

        // 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.Run(async (context) =>
            {
                var myClass = new Class();
                Configuration.Bind(myClass);//綁定基礎信息
                //輸出json配置到頁面
                await context.Response.WriteAsync($"ClassNo {myClass.ClassNo}");
                await context.Response.WriteAsync($"ClassDesc {myClass.ClassDesc}");
                await context.Response.WriteAsync($"myClass Count {myClass.Students.Count}");
            });
        }
    }
}

 5.啓動程序，輸出結果