MVC Controller return 格式之JsonResult、ContentResult、RedirectResult……

//语法


public class JsonResult : ActionResult

public class ContentResult : ActionResult

public class RedirectResult : ActionResult
eg：
public ActionResult Index() 
{ 
　　return View(); 
}
//返回一个子页
public ActionResult Ascx() 
{ 
　　return PartialView(); 
}
//返回文本
public ActionResult Text()
{
　　return Content("这是一段文本"); 
}
返回Json
public JsonResult GetJson() { 
var Data = new { demo = demoList, Total = demoList.Count}; //在这里必须要设置JSON的请求行为为GET 
return Json(Data, JsonRequestBehavior.AllowGet); 

} 

public ContentResult DoSelect(string StudentId) 
{ 
　　var result = "success"; 
　　return Content(JsonConvert.SerializeObject(result, Formatting.None)); 
}

public ActionResult Index() { //这个是BiewBag传值的方法 
ViewBag.Title = "Demo一览画面"; 
if (0 == demoList.Count) { //模拟select * from DemoModels 
for (int i = 1; i <= 7; i++) 
{ demoList.Add(this.CreateDemoModels(i)); } 
} 
return View(demoList); 
}

//输出JS文件
public ActionResult Js() 
{ 
　　return JavaScript("var x=0;"); 
}

//页面跳转
1.跳转到Url

public RedirectResult rdurl() 
{ 
　　return Redirect("http://www.baidu.com"); 
}
2.跳转到Action

public ActionResult rdaction() 
{ 
return RedirectToAction("Index","Eice"); 
}

3.跳转到Routing规则

public ActionResult rdrouting() 
{ 
　　return RedirectToRoute("Default",//Route名 
　　new{Controller = "Eice",Action = "Index" }); 
}

//显示文件
public ActionResult fn() 
{ 
　　return File("/Content/site.css","text/css"); 
}

        //Excel导入模板下载
        public FileResult GetFile()
        {
            const string url = "~/TempExcel/商品评论模板.xls";
            var fileName = Server.MapPath(url);
            var name = Path.GetFileName(fileName);
            return File(fileName, "application/ms-excel", Url.Encode(name));
        }

另外，

Webapi的接口返回值主要有四种类型

void无返回值
IHttpActionResult
HttpResponseMessage
自定义类型

详情参见：http://www.cnblogs.com/zfdcp-028/p/5788649.html

跳转到同一控制器内的action和不同控制器内的action、带有参数的action跳转和不带参数的action跳转。

一、RedirectToAction("Index");//一个参数时在本Controller下，不传入参数。

二、RedirectToAction(ActionName,ControllerName) //可以直接跳到别的Controller.

三、RedirectToRoute(new {controller="Home",action="Index"});//可跳到其他controller

四、RedirectToRoute(new {controller="Home",action="Index"， id=param});//可跳到其他controller,带参数。

五、Response.Redirect("Index?id=1");//适用于本controller下的方法名称,可带参数。
六、return Redirect("Index");//适用于本controller下的方法名称。

七、return View("Index"); //直接显示对应的页面不经过执行Controller的方法。
八、return View("~/Views/Home/Index.aspx");//这种方法是写全路径,直接显示页面,不经过Controller方法
九、return View();//直接显示页面,不经过Controller方法

重写返回结果HttpResponseMessage

    public class BaseController : ApiController
    {
        public int loginid { get; set; }

        public string loginname { get; set; }


        public BaseBll baseBll { get; set; }


        protected override void Initialize(HttpControllerContext controllerContext)
        {
            //初始化请求上下文
            base.Initialize(controllerContext);
            try
            {
                new SortedDictionary<string, string>();
                string username = string.Empty;
                HttpRequestHeaders headers = controllerContext.Request.Headers;
                if (headers.Contains("e"))
                {
                    text = (headers.GetValues("e").FirstOrDefault<string>().ToString() ?? string.Empty);
                    text = System.Web.HttpUtility.UrlDecode(username);
                }
                UserInfoEntity userInfo = new LoginBll().GetUserInfo(username);
                this.loginid = userInfo.LoginID;
                this.loginname = userInfo.LoginName;
                List<UserAuthorityEntity> tempList = userInfo.UserRole.UserAuthority;
                //不存在安全问题 后续文章有权限验证
                if (tempList.Where(c => c.AuthorityName == "权限名称").ToList().Count > 0)
                {   
                    //调用一个有权限的bll层
                    this.baseBll = new SeniorBll();
                }
                else
                { 
                    //调用一个没有权限的bll层
                    this.baseBll = new OrdinaryBll();
                }
            }
            catch (Exception ex)
            {
                LogHelper.WriteErrorLog("Initialize", ex);
            }
        }
        /// <summary>
        /// 设置action返回信息
        /// </summary>
        /// <param name="result">返回实体</param>
        /// <returns></returns>
        protected HttpResponseMessage GetHttpResponseMessage(object result)
        {
            BaseResponseEntity<object> responseBaseEntity = new BaseResponseEntity<object>(0, result, string.Empty);
            return new HttpResponseMessage()
            {
                Content =
                   new StringContent(JsonConvert.SerializeObject(responseBaseEntity, dtConverter), System.Text.Encoding.UTF8,
                       "application/json")
            };
        }
        /// <summary>
        /// 设置action返回信息
        /// </summary>
        /// <param name="result">返回实体</param>
        /// <param name="msg">返回的信息参数</param>
        /// <returns></returns>
        protected HttpResponseMessage GetHttpResponseMessage(object result, ref string msg)
        {
            BaseResponseEntity<object> responseBaseEntity = new BaseResponseEntity<object>(0, result, msg ?? string.Empty);
            return new HttpResponseMessage()
            {
                Content =
                   new StringContent(JsonConvert.SerializeObject(responseBaseEntity, dtConverter), System.Text.Encoding.UTF8,
                       "application/json")
            };
        }
    }

参考：http://blog.csdn.net/l1158513573/article/details/77045213 WebApi开发爬坑记之·一重写ApiController