Question

public class ModalTitleDecorator : ActionResult
{
     private readonly IActionResult _actionResult;
     private readonly string _modalTitle;

     public ModalTitleDecorator(IActionResult action, string modalTitle)
     {
         _actionResult = action;
         _modalTitle = modalTitle;
     }

      public override async Task ExecuteResultAsync(ActionContext context)
      {

          var tempData = context.HttpContext.RequestServices.GetService<ITempDataDictionaryFactory>()
                   .GetTempData(context.HttpContext);

         //always null...I assume that ViewData is not available according to HttpContext. 
         //TempData is available probably according to passing into next request.
         var viewData = context.HttpContext.RequestServices.GetService<ViewDataDictionary>();

         //something like this would be great
         ViewData["Title"] = _modalTitle;

         await _actionResult.ExecuteResultAsync(context);
      }
}

我们可以通过理解使它成一行吗？

Answer 1

IIUC，也许您正在寻找这种嵌套的理解

strats_having_fcs = {a.strategy: a.algorithmType for s in strategies for a in s.algorithms 
                     if a.algorithmType == AlgorithmTypeEnum.feedback_control.value}

Answer 2

只是：

strats_having_fcs = {a.strategy: a.algorithmType for s in strategies for a in s.algorithms if a.algorithmType == AlgorithmTypeEnum.feedback_control.value}

看看this这样的关于列表内理解的问题。对我来说，这澄清了很多背后的逻辑。

需要使用理解将代码包装在一行中

2 个答案: