ASP.NET MVC 源码分析（二） —— 从 IRouteBuilder认识路由构建

　　我们来看IRouteBuilder的定义：

    public interface IRouteBuilder
    {
        IRouter DefaultHandler { get; set; }

        IServiceProvider ServiceProvider { get; }

        IList<IRouter> Routes { get; }

        IRouter Build();
    }

一个默认的IRouter对象，一个Build方法，一个IRouter集合和一个获取服务对象IServiceProvider。

我们进一步看IRouteBuilder的实现RouterBuilder:

public class RouteBuilder : IRouteBuilder
    {
        public RouteBuilder()
        {
            Routes = new List<IRouter>();
        }

        public IRouter DefaultHandler { get; set; }

        public IServiceProvider ServiceProvider { get; set; }

        public IList<IRouter> Routes
        {
            get;
            private set;
        }

        public IRouter Build()
        {
            var routeCollection = new RouteCollection();

            foreach (var route in Routes)
            {
                routeCollection.Add(route);
            }

            return routeCollection;
        }
    }

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