其中IHtmlHelper
的@Html.Action
另一个静态扩展方法实现代码
using Microsoft.AspNetCore.Html; using Microsoft.AspNetCore.Http; using Microsoft.AspNetCore.Mvc.Infrastructure; using Microsoft.AspNetCore.Routing; using Microsoft.Extensions.DependencyInjection; using System; using System.IO; using System.Threading.Tasks; namespace Microsoft.AspNetCore.Mvc.Rendering { /// <summary> /// https://blog.csdn.net/WuLex/article/details/122761955 /// </summary> public static class HtmlHelperViewExtensions { public static IHtmlContent Action(this IHtmlHelper helper, string action, object parameters = null) { var controller = (string)helper.ViewContext.RouteData.Values["controller"]; return Action(helper, action, controller, parameters); } public static IHtmlContent Action(this IHtmlHelper helper, string action, string controller, object parameters = null) { var area = (string)helper.ViewContext.RouteData.Values["area"]; return Action(helper, action, controller, area, parameters); } public static IHtmlContent Action(this IHtmlHelper helper, string action, string controller, string area, object parameters = null) { if (action == null) throw new ArgumentNullException("action"); if (controller == null) throw new ArgumentNullException("controller"); var task = RenderActionAsync(helper, action, controller, area, parameters); return task.Result; } private static async Task<IHtmlContent> RenderActionAsync(this IHtmlHelper helper, string action, string controller, string area, object parameters = null) { var serviceProvider = helper.ViewContext.HttpContext.RequestServices; var actionContextAccessor = helper.ViewContext.HttpContext.RequestServices.GetRequiredService<IActionContextAccessor>(); var httpContextAccessor = helper.ViewContext.HttpContext.RequestServices.GetRequiredService<IHttpContextAccessor>(); var actionSelector = serviceProvider.GetRequiredService<IActionSelector>(); var routeData = new RouteData(); foreach (var router in helper.ViewContext.RouteData.Routers) { routeData.PushState(router, null, null); } routeData.PushState(null, new RouteValueDictionary(new { controller = controller, action = action, area = area }), null); routeData.PushState(null, new RouteValueDictionary(parameters ?? new { }), null); RouteContext routeContext = new RouteContext(helper.ViewContext.HttpContext) { RouteData = routeData }; var candidates = actionSelector.SelectCandidates(routeContext); var actionDescriptor = actionSelector.SelectBestCandidate(routeContext, candidates); var originalActionContext = actionContextAccessor.ActionContext; var originalhttpContext = httpContextAccessor.HttpContext; try { var newHttpContext = serviceProvider.GetRequiredService<IHttpContextFactory>().Create(helper.ViewContext.HttpContext.Features); if (newHttpContext.Items.ContainsKey(typeof(IUrlHelper))) { newHttpContext.Items.Remove(typeof(IUrlHelper)); } newHttpContext.Response.Body = new MemoryStream(); var actionContext = new ActionContext(newHttpContext, routeData, actionDescriptor); actionContextAccessor.ActionContext = actionContext; var invoker = serviceProvider.GetRequiredService<IActionInvokerFactory>().CreateInvoker(actionContext); await invoker.InvokeAsync(); newHttpContext.Response.Body.Position = 0; using (var reader = new StreamReader(newHttpContext.Response.Body)) { return new HtmlString(reader.ReadToEnd()); } } catch (Exception ex) { return new HtmlString(ex.Message); } finally { actionContextAccessor.ActionContext = originalActionContext; httpContextAccessor.HttpContext = originalhttpContext; if (helper.ViewContext.HttpContext.Items.ContainsKey(typeof(IUrlHelper))) { helper.ViewContext.HttpContext.Items.Remove(typeof(IUrlHelper)); } } } } }
在Startup中的 ConfigureServices 方法添加:
services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
services.AddSingleton<IActionContextAccessor, ActionContextAccessor>();
(备注:因为net core 默认不将IHttpContextAccessor,IActionContextAccessor 依赖注入,所以需要手动进行依赖注入)
https://codedefault.com/s/how-can-i-use-html-action-in-aspnet-core-application
https://blog.csdn.net/weixin_33554514/article/details/117835148