ASP.NET Core轻松入门Bind读取配置文件到C#实例

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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();
        }
   <span style="color: #ff0000;"> public static IWebHost BuildWebHost(string[] args) =&gt;
        WebHost.CreateDefaultBuilder(args)
            .UseStartup&lt;Startup&gt;()
            .Build();</span>
}
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;
    }</pre>


 

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) =&gt;
        {
            //var con = new ConfigurationBuilder().AddJsonFile("appsettings.json");
            //Configuration = con.Build();
            var myClass = new Class();
           
            Configuration.Bind(myClass);
            Console.WriteLine($"name:{myClass.Name}");
            Console.WriteLine();
            for (int i = 0; i &lt; myClass.Items.Count; i++)
            {
                await context.Response.WriteAsync($"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。


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