ASP.NET MVC中常用的ActionResult类型

// MVC 中的ActionResult是Action的返回结果. ActionResult有多个子类. 
        // 并不是所有的子类都需要返回视图View. 
        // ActionResult是一个抽象类, 他定义了唯一的ExecuteResult方法, 参数为一个ControllerContext.

        // GET: Home
        public ActionResult Index()
        {
            return View();
        }

        /// <summary>
        /// ContentResult用法（返回文本）
        /// http://localhost:30735/home/ContentResultDemo
        /// </summary>
        /// <returns>返回文本</returns>
        public ActionResult ContentResultDemo()
        {
            string str = "ContentResultDemo!";
            return Content(str);
        }

        /// <summary>
        /// EmptyResult的用法（返回空对象）
        /// http://localhost:30735/home/EmptyResultDemo
        /// </summary>
        /// <returns>返回一个空对象</returns>
        public ActionResult EmptyResultDemo()
        {
            return new EmptyResult();
        }

        /// <summary>
        /// FileContentResult的用法（返回图片）
        /// http://localhost:30735/home/FileContentResultDemo
        /// </summary>
        /// <returns>显示一个文件内容</returns>
        public ActionResult FileContentResultDemo()
        {
            FileStream fs = new FileStream(Server.MapPath(@"/Images/001.jpg"), FileMode.Open, FileAccess.Read);
            byte[] buffer = new byte[Convert.ToInt32(fs.Length)];
            fs.Read(buffer, 0, Convert.ToInt32(fs.Length));
            string contentType = "image/jpeg";
            return File(buffer, contentType);
        }

        /// <summary>
        /// FilePathResult的用法（返回图片）
        /// http://localhost:30735/home/FilePathResultDemo/002
        /// </summary>
        /// <param name="id">图片id</param>
        /// <returns>直接将返回一个文件对象</returns>
        public FilePathResult FilePathResultDemo(string id)
        {
            string path = Server.MapPath(@"/Images/" + id + ".jpg");
            //定义内容类型（图片）
            string contentType = "image/jpeg";
            //FilePathResult直接返回file对象
            return File(path, contentType);
        }

        /// <summary>
        /// FileStreamResult的用法（返回图片）
        /// http://localhost:30735/home/FileStreamResultDemo
        /// </summary>
        /// <returns>返回文件流（图片）</returns>
        public ActionResult FileStreamResultDemo()
        {
            FileStream fs = new FileStream(Server.MapPath(@"/Images/001.jpg"), FileMode.Open, FileAccess.Read);
            string contentType = "image/jpeg";
            return File(fs, contentType);
        }

        /// <summary>
        /// HttpUnauthorizedResult 的用法（抛出401错误）
        /// http://localhost:30735/home/HttpUnauthorizedResult
        /// </summary>
        /// <returns></returns>
        public ActionResult HttpUnauthorizedResultDemo()
        {
            return new HttpUnauthorizedResult();
        }

        /// <summary>
        /// HttpStatusCodeResult的方法（返回错误状态信息）
        ///  http://localhost:30735/home/HttpStatusCodeResult
        /// </summary>
        /// <returns></returns>
        public ActionResult HttpStatusCodeResultDemo()
        {
            return new HttpStatusCodeResult(500, "System Error");
        }

        /// <summary>
        /// HttpNotFoundResult的使用方法
        /// http://localhost:30735/home/HttpNotFoundResultDemo
        /// </summary>
        /// <returns></returns>
        public ActionResult HttpNotFoundResultDemo()
        {
            return new HttpNotFoundResult("not found action");
        }

        /// <summary>
        /// JavaScriptResult 的用法(返回脚本文件)
        /// http://localhost:30735/home/JavaScriptResultDemo
        /// </summary>
        /// <returns>返回脚本内容</returns>
        public ActionResult JavaScriptResultDemo()
        {
            return JavaScript(@"<script>alert(‘Test JavaScriptResultDemo!‘)</script>");
        }

        /// <summary>
        /// JsonResult的用法(返回一个json对象)
        /// http://localhost:30735/home/JsonResultDemo
        /// </summary>
        /// <returns>返回一个json对象</returns>
        public ActionResult JsonResultDemo()
        {
            var tempObj = new { Controller = "HomeController", Action = "JsonResultDemo" };
            return Json(tempObj);
        }

        /// <summary>
        /// RedirectResult的用法(跳转url地址)
        /// http://localhost:30735/home/RedirectResultDemo
        /// </summary>
        /// <returns></returns>
        public ActionResult RedirectResultDemo()
        {
            return Redirect(@"http://wwww.baidu.com");
        }

        /// <summary>
        /// RedirectToRouteResult的用法（跳转的action名称）
        /// http://localhost:30735/home/RedirectToRouteResultDemo
        /// </summary>
        /// <returns></returns>
        public ActionResult RedirectToRouteResultDemo()
        {
            return RedirectToAction(@"FileStreamResultDemo");
        }

        /// <summary>
        /// PartialViewResult的用法（返回部分视图）
        /// http://localhost:30735/home/PartialViewResultDemo
        /// </summary>
        /// <returns></returns>
        public PartialViewResult PartialViewResultDemo()
        {
            return PartialView();
        }

        /// <summary>
        /// ViewResult的用法（返回视图）
        ///  http://localhost:30735/home/ViewResultDemo
        /// </summary>
        /// <returns></returns>
        public ActionResult ViewResultDemo()
        {
            //如果没有传入View名称, 默认寻找与Action名称相同的View页面.
            return View();
        }