[AttributeUsage(AttributeTargets.Class|AttributeTargets.Method, AllowMultiple = false, Inherited = false)]
public class StaticFileHandlerFilterAttribute : ActionFilterAttribute
{
   public override void OnActionExecuted(ActionExecutedContext context){}
   public override void OnActionExecuting(ActionExecutingContext context){}
}

//按照一定的規(guī)則生成靜態(tài)文件的名稱，這里是按照area+"-"+controller+"-"+action+key規(guī)則生成
string controllerName = context.RouteData.Values["controller"].ToString().ToLower();
string actionName = context.RouteData.Values["action"].ToString().ToLower();
string area = context.RouteData.Values["area"].ToString().ToLower();
//這里的Key默認(rèn)等于id，當(dāng)然我們可以配置不同的Key名稱
string id = context.RouteData.Values.ContainsKey(Key) ? context.RouteData.Values[Key].ToString() : "";
if (string.IsNullOrEmpty(id) && context.HttpContext.Request.Query.ContainsKey(Key))
{
  id = context.HttpContext.Request.Query[Key];
}
string filePath = Path.Combine(AppContext.BaseDirectory, "wwwroot", area, controllerName + "-" + actionName + (string.IsNullOrEmpty(id) ? "" : ("-" + id)) + ".html");
//判斷文件是否存在
if (File.Exists(filePath))
{
　　//如果存在，直接讀取文件
  using (FileStream fs = File.Open(filePath, FileMode.Open))
  {
    using (StreamReader sr = new StreamReader(fs, Encoding.UTF8))
    {
　　　　　　 //通過(guò)contentresult返回文件內(nèi)容
       ContentResult contentresult = new ContentResult();
       contentresult.Content = sr.ReadToEnd();
       contentresult.ContentType = "text/html";
       context.Result = contentresult;
    }
  }
}

//獲取結(jié)果
IActionResult actionResult = context.Result;
 //判斷結(jié)果是否是一個(gè)ViewResult
    if (actionResult is ViewResult)
    {
      ViewResult viewResult = actionResult as ViewResult;
      //下面的代碼就是執(zhí)行這個(gè)ViewResult，并把結(jié)果的html內(nèi)容放到一個(gè)StringBuiler對(duì)象中
      var services = context.HttpContext.RequestServices;
      var executor = services.GetRequiredService<ViewResultExecutor>();
      var option = services.GetRequiredService<IOptions<MvcViewOptions>>();
      var result = executor.FindView(context, viewResult);
      result.EnsureSuccessful(originalLocations: null);
      var view = result.View;
      StringBuilder builder = new StringBuilder();
 
      using (var writer = new StringWriter(builder))
      {
        var viewContext = new ViewContext(
          context,
          view,
          viewResult.ViewData,
          viewResult.TempData,
          writer,
          option.Value.HtmlHelperOptions);
 
        view.RenderAsync(viewContext).GetAwaiter().GetResult();
        //這句一定要調(diào)用，否則內(nèi)容就會(huì)是空的
        writer.Flush();
      }
      //按照規(guī)則生成靜態(tài)文件名稱
      string area = context.RouteData.Values["area"].ToString().ToLower();
      string controllerName = context.RouteData.Values["controller"].ToString().ToLower();
      string actionName = context.RouteData.Values["action"].ToString().ToLower();
      string id = context.RouteData.Values.ContainsKey(Key) ? context.RouteData.Values[Key].ToString() : "";
      if (string.IsNullOrEmpty(id) && context.HttpContext.Request.Query.ContainsKey(Key))
      {
        id = context.HttpContext.Request.Query[Key];
      }
      string devicedir = Path.Combine(AppContext.BaseDirectory, "wwwroot", area);
      if (!Directory.Exists(devicedir))
      {
        Directory.CreateDirectory(devicedir);
      }
 
      //寫入文件
      string filePath = Path.Combine(AppContext.BaseDirectory, "wwwroot", area, controllerName + "-" + actionName + (string.IsNullOrEmpty(id) ? "" : ("-" + id)) + ".html");
      using (FileStream fs = File.Open(filePath, FileMode.Create))
      {
        using (StreamWriter sw = new StreamWriter(fs, Encoding.UTF8))
        {
          sw.Write(builder.ToString());
        }
      }
      //輸出當(dāng)前的結(jié)果
      ContentResult contentresult = new ContentResult();
      contentresult.Content = builder.ToString();
      contentresult.ContentType = "text/html";
      context.Result = contentresult;
    }

public string Key
{
  get;set;
}

//獲取文件信息對(duì)象
FileInfo fileInfo=new FileInfo(filePath);
//結(jié)算時(shí)間間隔，如果小于等于兩分鐘，就直接輸出，當(dāng)然這里的規(guī)則可以改
TimeSpan ts = DateTime.Now - fileInfo.CreationTime;
if(ts.TotalMinutes<=2)
{
  using (FileStream fs = File.Open(filePath, FileMode.Open))
  {
    using (StreamReader sr = new StreamReader(fs, Encoding.UTF8))
    {
      ContentResult contentresult = new ContentResult();
      contentresult.Content = sr.ReadToEnd();
      contentresult.ContentType = "text/html";
      context.Result = contentresult;
    }
  }
}