动态更改视图的路径

Question

我有这堂课：

public abstract class MyController : Controller
{
  protected override void OnActionExecuting(ActionExecutingContext filterContext)
  {
      string viewPath = filterContext/*... .ViewPath*/;
      viewPath = "Some new View Path";
  }
}

我想用另一个检索并替换正在执行的视图的路径。我试图在Web调用上调试 - 查看过滤器上下文，但是我没有设法找到即将呈现的视图。

我该怎么做？

Answer 1

来自MSDN：

Controller.OnActionExecuting Method：在之前调用调用操作方法。在此阶段，由于ActionResult尚未执行，因此不存在Action。

您最好使用OnResultExecuting代替：

protected override void OnResultExecuting(ResultExecutingContext filterContext)
{
    var viewResult = filterContext.Result as ViewResult;

    if (viewResult != null)
    {
        var razorEngine = viewResult.ViewEngineCollection.OfType<RazorViewEngine>().Single();
        var viewName = !String.IsNullOrEmpty(viewResult.ViewName) ? viewResult.ViewName : filterContext.RouteData.Values["action"].ToString();
        var razorView = razorEngine.FindView(filterContext.Controller.ControllerContext, viewName, viewResult.MasterName, false).View as RazorView;
        var currentPath = razorView.ViewPath;
        var newPath = currentPath.Replace("..", "...");
        viewResult.View = new RazorView(filterContext.Controller.ControllerContext, newPath, razorView.LayoutPath, razorView.RunViewStartPages, razorView.ViewStartFileExtensions);
    }

    base.OnResultExecuting(filterContext);
}