我通过ViewBag从ActionFilter传递的数据无法在View中访问

Question

我想将自定义操作过滤器中的一些信息传递给视图。我像这样使用ViewBag，但在视图中，属性ViewBag.Title和ViewBag.Message都评估为null。

public override void OnActionExecuting(ActionExecutingContext filterContext)
{
    ...

    filterContext.Controller.ViewBag.Title = "Session Expired";
    filterContext.Controller.ViewBag.Message = "Your session has expired. Please login again.";
    filterContext.Result = 
            new ViewResult 
            { 
              ViewName = "~/Views/Shared/Info.cshtml" 
            };
}

在视图中

<div class="row">
        <div class = 
             "col-lg-8 col-md-8 col-sm-8 col-xs-12 
              col-lg-offset-2 col-md-offset-2 col-sm-offset-2 
              col-xs-offset-0">

            <h2>@ViewBag.Title</h2>

            <h3>@ViewBag.Message</h3>
        </div>
</div>

Answer 1

ViewResult上有一个ViewBag属性，您可以在其中设置要传递给视图的viewBag项。您可以将动态对象设置为值。

filterContext.Result = new ViewResult
                          {
                             ViewName = "~/Views/Shared/Info.cshtml" ,
                             ViewBag= { Message="SS",Title="Hi title"}
                          };