[MVC 4] ActionResult 使用示例

在控制器 HomeController.cs 中使用以下代码

public ActionResult Contact()
        {
            ViewBag.Message = "Your contact page.";

            return View();
        }

        public ActionResult Display()
        {
            var name = (string)RouteData.Values["id"];
            var model = string.Empty;
            // model = "Test";
            // 如果为空 则返回自身
            // 如果为不存在的视图 则报错
            if (model == null)
            {
                // Url 也会跟随变化为 /home/NotFound
                return RedirectToAction("NotFound");
            }
            return View(model);
        }

        public ActionResult NotFound()
        {
            return View();
        }

        public FileResult DownloadPicture()
        {
            var name = (string)RouteData.Values["id"];
            var picture = "/Content/Picture/" + name + ".jpg";
            var contentType = "image/jpg";
            /*
            // 下载后自动返回到上一页
            var fileName = name + ".jpg";
            return File(picture, contentType, fileName);
             * */
            // 在浏览器显示图片
            return File(picture, contentType);
        }

        public HttpStatusCodeResult UnauthorizedError()
        {
            // 这将跳转到登录页面 web.config 里指定路径
            return new HttpUnauthorizedResult("Custom Unauthorized Error");
        }

        public ActionResult NotFoundError()
        {
            return HttpNotFound("Nothing here...");
        }

测试各种 Result 使用方法.