C# 通过自定义taghelper渲染局部视图

我到处都搜索过，我想要的基本上是MVC6的RenderViewToString，它不使用控制器或动作的上下文

由于自定义标记帮助器进入自己的类，因此这些上下文将不可用

目前我有以下代码，我非常想把html放在Razor视图中，因为这是不可接受的lol

public class WindowTagHelper : TagHelper
{
    public string Title { get; set; }
    public async override Task ProcessAsync(TagHelperContext context, TagHelperOutput output)
    {
        var preContent = await output.GetChildContentAsync();      
        var id = context.UniqueId;
        output.TagName = "div";
        output.Attributes["id"] = id;
        output.Attributes["class"] = "window";
        output.TagMode = TagMode.StartTagAndEndTag;

        var windowControls = new StringBuilder();
        windowControls.Append("<div class=\"window-controls\">");
        windowControls.Append("<ul class=\"window-icon-list\">");  

        var minimizeIcon = "<li class=\"control-icon\"><a data-window-id=\"{0}\" class=\"control-icon-minimize\" href=\"#\" data-toggle=\"tooltip\" title=\"Minimize Window\"><div class=\"fa fa-minus\"></div></a></li>".InjectWith(id);
        var maximizeIcon = "<li class=\"control-icon\"><a data-window-id=\"{0}\" class=\"control-icon-maximize\" href=\"#\" data-toggle=\"tooltip\" title=\"Maximize Window\"><div class=\"fa fa-square-o\"></div></a></li>".InjectWith(id);
        var closeIcon = "<li class=\"control-icon\"><a data-window-id=\"{0}\" class=\"control-icon-close\" href=\"#\" data-toggle=\"tooltip\" title=\"Close Window\"><div class=\"fa fa-close\"></div></a></li>".InjectWith(id);

        windowControls.Append(minimizeIcon);
        windowControls.Append(maximizeIcon);
        windowControls.Append(closeIcon);
        windowControls.Append("</ul>");
        windowControls.Append("</div>");

        var content = new StringBuilder();
        content.AppendFormat("<div class=\"window-title\">{0}{1}</div>", windowControls.ToString(), Title);
        content.Append(preContent.GetContent());
        output.Content.AppendHtml(content.ToString());          
    }
}

---

我们通过自定义taghelper和ViewContext的扩展实现了它

  [ViewContext]
  public ViewContext ViewContext { get; set; }

  public async override void Process(TagHelperContext context, TagHelperOutput output)
  {
     var sw = new StringWriter();

     // Create a new viewData (viewbag). This will be used in a new ViewContext to define the model we want
     ViewDataDictionary viewData = new ViewDataDictionary(ViewContext.ViewData, For.Model);

     // Generate a viewContext with our viewData
     var viewContext = new ViewContext(ViewContext, ViewContext.View, viewData, ViewContext.TempData, sw, new HtmlHelperOptions());

     // Use the viewContext to run the given ViewName
     output.Content.Append(new HtmlString(await viewContext.RenderPartialView(ViewName)));

  }


  public async static Task<string> RenderPartialView(this ViewContext context, string viewName, ICompositeViewEngine viewEngine = null, ViewEngineResult viewResult = null)
  {
     viewEngine = viewEngine ?? context.HttpContext.RequestServices.GetRequiredService<ICompositeViewEngine>();

     viewResult = viewResult ?? viewEngine.FindPartialView(context, viewName);

     await viewResult.View.RenderAsync(context);

     return context.Writer.ToString();

  }

[ViewContext]
公共视图上下文{get；set；}
公共异步重写无效进程（TagHelperContext上下文，TagHelperOutput输出）
{
var sw=新的StringWriter（）；
//创建新的viewData（viewbag）。这将在新的ViewContext中用于定义所需的模型
ViewDataDictionary viewData=新的ViewDataDictionary（ViewContext.viewData，用于.Model）；
//使用viewData生成viewContext
var viewContext=newviewcontext（viewContext，viewContext.View，viewData，viewContext.TempData，sw，new-htmlhelpropoptions（））；
//使用viewContext运行给定的ViewName
output.Content.Append（新的HtmlString（wait viewContext.RenderPartialView（ViewName））；
}
公共异步静态任务RenderPartialView（此ViewContext上下文、字符串viewName、ICompositeViewEngine viewEngine=null、ViewEngineResult viewResult=null）
{
viewEngine=viewEngine？？context.HttpContext.RequestServices.GetRequiredService（）；
viewResult=viewResult？？viewEngine.FindPartialView（上下文，viewName）；
等待viewResult.View.RenderAsync（上下文）；
返回context.Writer.ToString（）；
}

您从何处获取ViewContext？@NullBy7e注入到我的标记帮助中。Up刚刚发现了一个关于

[ViewContext]

属性的问题。此解决方案适用于RCx版本，但在.NET Core的RTM中不起作用<代码>视图结果。视图始终为空。@JoãoPereira看起来他们稍微改变了viewEngine。您需要调用GetView。

  [ViewContext]
  public ViewContext ViewContext { get; set; }

  public async override void Process(TagHelperContext context, TagHelperOutput output)
  {
     var sw = new StringWriter();

     // Create a new viewData (viewbag). This will be used in a new ViewContext to define the model we want
     ViewDataDictionary viewData = new ViewDataDictionary(ViewContext.ViewData, For.Model);

     // Generate a viewContext with our viewData
     var viewContext = new ViewContext(ViewContext, ViewContext.View, viewData, ViewContext.TempData, sw, new HtmlHelperOptions());

     // Use the viewContext to run the given ViewName
     output.Content.Append(new HtmlString(await viewContext.RenderPartialView(ViewName)));

  }


  public async static Task<string> RenderPartialView(this ViewContext context, string viewName, ICompositeViewEngine viewEngine = null, ViewEngineResult viewResult = null)
  {
     viewEngine = viewEngine ?? context.HttpContext.RequestServices.GetRequiredService<ICompositeViewEngine>();

     viewResult = viewResult ?? viewEngine.FindPartialView(context, viewName);

     await viewResult.View.RenderAsync(context);

     return context.Writer.ToString();

  }