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如何在ASP.NET Core中构造UrlHelper，及ASP.NET Core MVC路由讲解

参考文章：

除了上面参考文章中介绍的方法，其实在ASP.NET Core MVC的Filter拦截器中要使用UrlHelper非常简单。如下代码就展示了如何在IActionFilter拦截器中构造和使用UrlHelper，其它MVC的Filter拦截器如法炮制即可：

using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Filters;
using Microsoft.AspNetCore.Mvc.Routing;
using System;

namespace WebApi.Filters
{
    public class MyActionFilterAttribute : Attribute, IActionFilter
    {
        /// <summary>
        /// OnActionExecuting方法在Controller的Action执行前执行
        /// </summary>
        public void OnActionExecuting(ActionExecutingContext context)
        {
            IUrlHelper urlHelper = new UrlHelper(new ActionContext(context.HttpContext, context.RouteData, context.ActionDescriptor));

            string actionUrl = urlHelper.Action("Display", "User", new { id = 15 });
        }

        /// <summary>
        /// OnActionExecuted方法在Controller的Action执行后执行
        /// </summary>
        public void OnActionExecuted(ActionExecutedContext context)
        {
            IUrlHelper urlHelper = new UrlHelper(new ActionContext(context.HttpContext, context.RouteData, context.ActionDescriptor));

            string actionUrl = urlHelper.Action("About", "Home", new { id = 15 });
        }
    }
}