（十二）Bind读取配置到C#实例

  • 继续上一节的，接下来用Options或者Bind把json文件里的配置转成C#的实体，相互之间映射起来。首先新建一个asp.net core mvc项目OptionsBindSample
  • Startup.cs，这里用依赖注入把Configuration加进来
  • 1         public IConfiguration Configuration { get; set; }
2 
3         public Startup(IConfiguration configuration)
4         {
5             this.Configuration = configuration;
6         }

     

  • 再建立一个Class.cs
  •  1 public class Class
 2         {
 3             public int ClassNo { get; set; }
 4             public string ClassDesc { get; set; }
 5             public List<Student> Students { get; set; }
 6         }
 7 
 8         public class Student
 9         {
10             public string Name { get; set; }
11             public string Age { get; set; }
12         }

     

  • 再建一个appsettings.json(名称一定要叫这个，因为在Program.cs中WebHost.CreateDefaultBuilder(args)会默认读取appsettings.json文件)
  •  1 {
 2   "ClassNo": "1",
 3   "ClassDesc": "ASP.NET Core 101",
 4   "Students": [
 5     {
 6       "name": "liuxh",
 7       "age": "31"
 8     },
 9     {
10       "name": "linhj",
11       "age": "31"
12     },
13     {
14       "name": "liuxy",
15       "age": "7"
16 
17 
18 
19     },
20     {
21       "name": "liuss",
22       "age": "1"
23     }
24   ]
25 
26 }

     

  • 最后Starup.cs代码是这样的
  •         public IConfiguration Configuration { get; set; }

        public Startup(IConfiguration configuration)
        {
            this.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);//把配置文件的信息和对象映射起来

                await context.Response.WriteAsync($"ClassNo:{myClass.ClassNo}");
                await context.Response.WriteAsync($"ClassDesc:{myClass.ClassDesc}");
                await context.Response.WriteAsync($"{myClass.Students.Count} Students");

            }); 
        }

     

  • 最后启动网站
posted @ 2018-05-18 21:31  liu_xh  阅读(1107)  评论(0)  编辑  收藏  举报