.Net Core 创建和使用中间件

1. 定义中间内容

1.1 必须有一个RequestDelegate 委托用了进入一个中间件

1.2 通过构造函数设置这个RequestDelegate委托

1.3 必须有一个方法Task Invoke，在这个方法里编写中间件内容最后执行RequestDelegate委托

using Microsoft.AspNetCore.Http;

using System;

using System.Collections.Generic;

using System.Linq;

using System.Threading.Tasks;

namespace Haos.Develop.CoreTest

{

    public class TestMiddleware

    {

        protected RequestDelegate Next;

        /// <summary>

        /// 参数

        /// </summary>

        public string Str { get; set; }

        public TestMiddleware(RequestDelegate next,string s)

        {

            Next = next;

            Str = s;

        }

        public virtual Task Invoke(HttpContext context)

        {

            context.Response.WriteAsync("this is test string");

            return Next(context);

        }

    }

}

2. 编写一个扩展方法用来添加到程序中

using Haos.Develop.CoreTest.Service;

using Microsoft.AspNetCore.Builder;

using Microsoft.Extensions.DependencyInjection;

using System;

using System.Collections.Generic;

using System.Linq;

using System.Threading.Tasks;

namespace Haos.Develop.CoreTest

{

    public static class Extension

    {

        public static IApplicationBuilder UserTestMiddleWare(this IApplicationBuilder app, string str)

        {

            return app.UseMiddleware<TestMiddleware>(str);

        }

    }

}

3. 在Startup添加中间件

// 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();

            }

            //扩展方式添加

            app.UserTestMiddleWare("this is test param");

            //直接添加中间件方式

            app.Use((context, next) =>

            {

                context.Response.WriteAsync("this is test");

                return next();

            });

        }

巴特西

.Net Core 创建和使用中间件

最新文章

热门文章