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实现加载md文档内容

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hogan
2019-01-10 16:42:20 +08:00
parent 676c0f07a7
commit d9c0ba52fa
15 changed files with 605 additions and 53 deletions
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101
Examples/website/FreeSql.Site.UI/Common/HtmlHelperViewExtensions.cs Normal file
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using Microsoft.AspNetCore.Html;
using Microsoft.AspNetCore.Mvc;
using System;
using Microsoft.AspNetCore.Routing;
using System.IO;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc.Infrastructure;
using System.Threading.Tasks;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.AspNetCore.Mvc.Rendering;
namespace FreeSql.Site.UI.Common
{
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)
{
// fetching required services for invocation
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>();
// creating new action invocation context
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);
//get the actiondescriptor
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));
}
}
}
}
}

40
Examples/website/FreeSql.Site.UI/Common/MarkdownTagHelper.cs Normal file
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using CommonMark;
using Microsoft.AspNetCore.Mvc.ViewFeatures;
using Microsoft.AspNetCore.Razor.TagHelpers;
using System.Net;
using System.Threading.Tasks;
namespace FreeSql.Site.UI.Common.TagHelpers
{
[HtmlTargetElement("markdown", TagStructure = TagStructure.NormalOrSelfClosing)]
[HtmlTargetElement(Attributes = "markdown")]
public class MarkdownTagHelper : TagHelper
{
public MarkdownTagHelper()
{
}
public ModelExpression Content { get; set; }
public async override Task ProcessAsync(TagHelperContext context, TagHelperOutput output)
{
if (output.TagName == "markdown")
{
output.TagName = null;
}
output.Attributes.RemoveAll("markdown");
var content = await GetContent(output);
var markdown = WebUtility.HtmlEncode(WebUtility.HtmlDecode(content));
var html = CommonMarkConverter.Convert(markdown);
output.Content.SetHtmlContent(html ?? "");
}
private async Task<string> GetContent(TagHelperOutput output)
{
if (Content == null)
return (await output.GetChildContentAsync()).GetContent();
return Content.Model?.ToString();
}
}
}