责任链方式编写管道

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace TestPipeline
{
    public class Testcs
    {
        public delegate void LineDelegate(int id);

        private static readonly IList<Func<LineDelegate, LineDelegate>> _items = new List<Func<LineDelegate, LineDelegate>>();

        /// <summary>
        /// 
        /// </summary>
        /// <param name="line">第一个 LineDelegate  是下一个，返回的当前生成的LineDelegate</param>
        public void Append(Func<LineDelegate, LineDelegate> line)
        {
            _items.Add(line);
        }

        public LineDelegate Build()
        {
            LineDelegate ending = (id) =>
            {
                Console.WriteLine("默认的接收编号是:" + id);
            };

            foreach (var item in _items.Reverse())
            {
                ending = item(ending);
            }

            return ending;
        }

        public void Run()
        {
            Append((next) =>
            {
                return id =>
                {

                    Console.WriteLine("权限校验 开始");

                    next(2);

                    Console.WriteLine("权限校验 结束");

                    Console.WriteLine("【权限校验】接收的编号是:" + id);
                };

            });


            Append((next) =>
            {
                return id =>
                {

                    Console.WriteLine("页面校验 开始");

                    next(3);

                    Console.WriteLine("页面校验 结束");

                    Console.WriteLine("【页面校验】接收的编号是:" + id);
                };

            });

            Build()(1);
        }

        /// <summary>
        ///  最原始的方式 实现Run 和 Build
        /// </summary>
        public void Run2()
        {

            Func<LineDelegate, LineDelegate> lineFuc1 = (next) =>
            {
                return id =>
                {

                    Console.WriteLine("权限校验 开始");

                    next(2);

                    Console.WriteLine("权限校验 结束");

                    Console.WriteLine("【权限校验】接收的编号是:" + id);
                };
            };


            Func<LineDelegate, LineDelegate> lineFuc2 = (next) =>
            {
                return id =>
                {


                    Console.WriteLine("页面校验 开始");

                    next(3);

                    Console.WriteLine("页面校验 结束");

                    Console.WriteLine("【页面校验】接收的编号是:" + id);
                };
            };

            LineDelegate ending = (id) =>
            {
                Console.WriteLine("默认的接收编号是:" + id);
            };

            //传入 最后一个，返回第二个中间件委托
            var mid = lineFuc2(ending);

            //传入 第二个 返回第一步
            var start = lineFuc1(mid);

            start(1);
        }

    }
}