.net core 应用Nancy快速实现轻量级webapi

2022-10-16 13:09:42

目前大量数据接口均采用API的方式为各类应用提供数据服务。Nancy是.net下实现webapi的一个轻量级的框架，可以快速搭建一个api服务环境，是一种快速建立api服务的不错选择。

本文记录.net core环境下利用Nancy快速搭建webapi的全过程。

Ⅰ.开发环境

跨平台的：.net core 2.1

宇宙级ide：vs2017

Ⅱ.代码实现

1.新建应用框架

2.下载安装Nancy类库，由于需要支持.netcore环境，则需要安装Nancy2.0版本。执行下面的包安装命令。

所需要包的目录结构如下：

3.实现.netcore支持Nancy,修改Startup.cs文件中Configure的内容

using Microsoft.AspNetCore.Builder;using Microsoft.AspNetCore.Hosting;using Microsoft.Extensions.DependencyInjection;using Nancy.Owin;namespace Nancy.Web
{publicclass Startup
    {// 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, visithttps://go.microsoft.com/fwlink/?LinkID=398940publicvoid ConfigureServices(IServiceCollection services)
        {
        }// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.publicvoid Configure(IApplicationBuilder app, IHostingEnvironment env)
        {if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            app.UseOwin(x=> x.UseNancy());//app.Run(async (context) =>//{//    await context.Response.WriteAsync("Hello World!");//});        }
    }
}

3.实现路由访问，新建HomeModule.cs类，继承NancyModule，开始写Nancy格式的路由。路由写法参见文档。

using System;using System.Collections.Generic;using System.Linq;using System.Threading.Tasks;using Nancy;using Nancy.ModelBinding;namespace Nancy.Web
{publicclass HomeModule:NancyModule
    {public HomeModule()
        {
            Get("/", r =>"Hello，Nancy，i am running on ASP.NET Core");
            Get("/{name}", r =>"你好：" + r.name);


            Post("/loadstr", r =>
            {var strRecive =this.Bind<InputStr>();return strRecive.inputstr;
            });
        }
    }
}

4.解决跨域访问，新建Bootstrapper.cs类，该类为Nancy特有配置类，重写ApplicationStartup方法。

using Nancy.Bootstrapper;using Nancy.TinyIoc;namespace Nancy.Web
{publicclass Bootstrapper: DefaultNancyBootstrapper
    {protectedoverridevoid ApplicationStartup(TinyIoCContainer container, IPipelines pipelines)
        {//CORS Enable  解决跨域问题
            pipelines.AfterRequest.AddItemToEndOfPipeline((ctx) =>
            {

                ctx.Response.WithHeader("Access-Control-Allow-Origin","*")// * 允许跨域问题的网站  *号代表面向所有网站  也可指定网站，如http://localhost:8080
                            .WithHeader("Access-Control-Allow-Methods","POST,GET,PUT,DELETE,OPTION")
                            .WithHeader("Access-Control-Allow-Headers","Accept, Origin, Content-type");

            });

        }
    }
}

5.新建InputStr.cs类，用于测试post提交数据

using System;using System.Collections.Generic;using System.Linq;using System.Threading.Tasks;namespace Nancy.Web
{publicclass InputStr
    {publicstring inputstr {get;set; }//定义输入字符串
    }
}