ViewResult（）和ActionResult（）之间的区别

本文翻译自：Difference Between ViewResult() and ActionResult()

What is the difference between ViewResult() and ActionResult() in ASP.NET MVC? ASP.NET MVC中的ViewResult()和ActionResult()什么区别？

public ViewResult Index()
{return View();
}public ActionResult Index()
{return View();
}

#1楼

参考：https://stackoom.com/question/Ju3x/ViewResult-和ActionResult-之间的区别

#2楼

In the Controller , one could use the below syntax 在Controller中，可以使用以下语法

public ViewResult EditEmployee() {return View();
}public ActionResult EditEmployee() {return View();
}

In the above example , only the return type varies . 在上面的示例中，只有返回类型不同。 one returns ViewResult whereas the other one returns ActionResult . 一个返回ViewResult而另一个返回ActionResult 。

ActionResult is an abstract class . ActionResult是一个抽象类。 It can accept: 它可以接受：

ViewResult , PartialViewResult, EmptyResult , RedirectResult , RedirectToRouteResult , JsonResult , JavaScriptResult , ContentResult, FileContentResult , FileStreamResult , FilePathResult etc. ViewResult，PartialViewResult，EmptyResult，RedirectResult，RedirectToRouteResult，JsonResult，JavaScriptResult，ContentResult，FileContentResult，FileStreamResult，FilePathResult等。

The ViewResult is a subclass of ActionResult . ViewResult是ActionResult的子类。

#3楼

ActionResult is an abstract class. ActionResult是一个抽象类。

ViewResult derives from ActionResult . ViewResult派生自ActionResult 。 Other derived classes include JsonResult and PartialViewResult . 其他派生类包括JsonResult和PartialViewResult 。

You declare it this way so you can take advantage of polymorphism and return different types in the same method. 您以这种方式声明它，以便您可以利用多态并在同一方法中返回不同的类型。

eg: 例如：

public ActionResult Foo()
{if (someCondition)return View(); // returns ViewResultelsereturn Json(); // returns JsonResult
}

#4楼

ViewResult is a subclass of ActionResult. ViewResult是ActionResult的子类。 The View method returns a ViewResult. View方法返回ViewResult。 So really these two code snippets do the exact same thing. 所以这两个代码片段确实完全相同。 The only difference is that with the ActionResult one, your controller isn't promising to return a view - you could change the method body to conditionally return a RedirectResult or something else without changing the method definition. 唯一的区别是，使用ActionResult，您的控制器不承诺返回视图 - 您可以更改方法体以有条件地返回RedirectResult或其他内容，而无需更改方法定义。

#5楼

ActionResult is an abstract class that can have several subtypes. ActionResult是一个抽象类，可以有几个子类型。

ActionResult Subtypes ActionResult子类型

ViewResult - Renders a specifed view to the response stream ViewResult - 将指定的视图呈现给响应流
PartialViewResult - Renders a specifed partial view to the response stream PartialViewResult - 将指定的部分视图呈现给响应流
EmptyResult - An empty response is returned EmptyResult - 返回空响应
RedirectResult - Performs an HTTP redirection to a specifed URL RedirectResult - 执行HTTP重定向到指定的URL
RedirectToRouteResult - Performs an HTTP redirection to a URL that is determined by the routing engine, based on given route data RedirectToRouteResult - 根据给定的路由数据执行HTTP重定向到由路由引擎确定的URL
JsonResult - Serializes a given ViewData object to JSON format JsonResult - 将给定的ViewData对象序列化为 JSON格式
JavaScriptResult - Returns a piece of JavaScript code that can be executed on the client JavaScriptResult - 返回可在客户端上执行的一段JavaScript代码
ContentResult - Writes content to the response stream without requiring a view ContentResult - 无需视图即可将内容写入响应流
FileContentResult - Returns a file to the client FileContentResult - 将文件返回给客户端
FileStreamResult - Returns a file to the client, which is provided by a Stream FileStreamResult - 将文件返回给客户端，该文件由Stream提供
FilePathResult - Returns a file to the client FilePathResult - 将文件返回给客户端

Resources 资源

What's the difference between ActionResult and ViewResult for action method? ActionResult和ViewResult for action方法有什么区别？ [ASP.NET Forums] [ASP.NET论坛]

#6楼

In Controller i have specified the below code with ActionResult which is a base class that can have 11 subtypes in MVC like: ViewResult, PartialViewResult, EmptyResult, RedirectResult, RedirectToRouteResult, JsonResult, JavaScriptResult, ContentResult, FileContentResult, FileStreamResult, FilePathResult. 在Controller中，我使用ActionResult指定了下面的代码，ActionResult是一个基类，在MVC中可以有11个子类型：ViewResult，PartialViewResult，EmptyResult，RedirectResult，RedirectToRouteResult，JsonResult，JavaScriptResult，ContentResult，FileContentResult，FileStreamResult，FilePathResult。

    public ActionResult Index(){if (HttpContext.Session["LoggedInUser"] == null){return RedirectToAction("Login", "Home");}else{return View(); // returns ViewResult}}
//More Examples[HttpPost]public ActionResult Index(string Name){ViewBag.Message = "Hello";return Redirect("Account/Login"); //returns RedirectResult}[HttpPost]public ActionResult Index(string Name){return RedirectToRoute("RouteName"); // returns RedirectToRouteResult}

Likewise we can return all these 11 subtypes by using ActionResult() without specifying every subtype method explicitly. 同样，我们可以通过使用ActionResult（）返回所有这11个子类型，而无需显式指定每个子类型方法。 ActionResult is the best thing if you are returning different types of views. 如果要返回不同类型的视图，ActionResult是最好的选择。