ASP.NET Core轻松入门Bind读取配置文件到C#实例

首先新建一个ASP.NET Core空项目,命名为BindReader

然后 向项目中添加一个名为appsettings.json的json文件，为什么叫appsettings呢？  打开Program.cs 

 

 public class Program    {        public static void Main(string[] args)        {            BuildWebHost(args).Run();        }        public static IWebHost BuildWebHost(string[] args) =>            WebHost.CreateDefaultBuilder(args)                .UseStartup<Startup>()                .Build();    }

代码中的IWebHost在启动时，具有自动加载appsettings.json的特性，所以命名成这个就不用特意地加载了。

 

然后再appsetting.json中写入数据，数据如下：

 

{  "Name": "pragram language",  "Items": [    {      "Language": "C#",      "Tool": "visual studio"    },    {      "Language": "JAVA",      "Tool": "Elcipse"    }  ]}

在项目中添加一个Class的类，根据该json文件的结构，创建Clsaa类中的内容，注意Class中的字段名称和Json中的字段名称必须要个匹配，一一对应。

 

Claa类中的代码如下：

 

 public class Class    {        public String Name { get; set; }        public List<Item> Items { get; set; }    }    public class Item    {        public string Language { get; set; }        public string Tool { get; set; }    }

可以看到字段与Json内的数据时一一对应的。

 

打开startup.cs文件

修改startup.cs的构造函数并添加Connection属性

 

 public IConfiguration Configuration { get; set; }        public Startup(IConfiguration configuration)        {            Configuration = configuration;        }

 

实例化一个Class类

 

   var myClass = new Class();

 

通过connection将配置文件中的数据来绑定Class实例

 

 Configuration.Bind(myClass);

 

数据展现

 

 Console.WriteLine($"name:{myClass.Name}");                Console.WriteLine();                for (int i = 0; i < myClass.Items.Count; i++)                {                    await context.Response.WriteAsync($"language:{myClass.Items[i].Language}");                    await context.Response.WriteAsync($"tool:{myClass.Items[i].Tool}");                }

 

总体的startup.cs中的代码如下：

 

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.Configuration;using Microsoft.Extensions.DependencyInjection;namespace BindReader{    public class Startup    {        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 con = new ConfigurationBuilder().AddJsonFile("appsettings.json");                //Configuration = con.Build();                var myClass = new Class();                               Configuration.Bind(myClass);                Console.WriteLine($"name:{myClass.Name}");                Console.WriteLine();                for (int i = 0; i < myClass.Items.Count; i++)                {                    await context.Response.WriteAsync($"language:{myClass.Items[i].Language}");                    await context.Response.WriteAsync($"tool:{myClass.Items[i].Tool}");                }                await context.Response.WriteAsync("Hello World!");            });        }    }}

以上完整github项目代码地址：https://github.com/liuzhenyulive/BindReader

 

有任何疑问可以在评论区留言。