Choosing the derived type for a specific result is a good practice, but when you. Actionresult is a return type of a controller method in asp. The following is the signature of a typical action method in a controller. If you attempt to redirect to the action above, mvc will throw an exception saying. Net mvc 4 by adam freeman and steven sanderson apress, 2012. Dino shows you how simple this can be using a tailormade actionresult class. There is no longer need for this custom actionresult because asp. So when you see mvc controller and action codes as shown below. See the project repository for more information and available features.
The action result is a very generic return value for an action. Actionresult is an abstract class that represents the result of an action method. Net mvc5 action methods and action results in this post, i am going to talk about what action methods are and different action result types available to us in asp. Net mvc 5 because the contentresult is a data type whose base data type is actionresult, hence you have to understand action result. All examples in this revised edition are based on asp. Part 78 different types of actionresult in asp net mvc youtube. There are already plenty of articles written on this subject. Extending the controller this chapter covers understanding the controller extensibility points discovering the requirements for an action using action selectors creating custom action results reducing controller complexity with selection from asp. In this article we are going to see about uploading and returning files in an mvc application. The framework encourages you to maintain a clear separation of concerns views for ui, controllers for. In this video, we will discuss different types of actionresult objects that can be returned by an action method. A simple pdf actionresult in mvc posted on november 19, 2012 by cprakash recently, i needed an actionresult implementation to return the pdf documents from my controller action to mvc views and it tooks few minutes to build the functionality on the existing fileresult. Difference between viewresult and actionresult in mvc.
For example, enter a url into the browser, click on any particular link. Altering action results with filters linkedin learning. An action filter is an attribute that you can apply to a controller action or an entire controller that modifies the way in which the action is executed. Net mvc actionresult and viewresult both are mainly a return type for controller action method. Action results handle the execution of the result requested by an action method. Weve just bought the wrox book but its more than a week away from delivery and id like. Net mvc 4 controllers controller serves the web request first, so when ever a request has been made from the user ex. Download the files the instructor uses to teach the. Both redirectresult and fileresult are inheriting from this actionresult abstract class also your if condition does not makes sense. Lightweight controllers this chapter covers using lightweight controllers to simplify programming managing common view data without filter attributes deriving action results to apply common behavior using an application selection from asp. Change your action method return type to actionresult. Introduction in the company im currently working for, it is a common practice to use devexpress xtrareports to create all kind of reports.
In the last chapter, you have seen an actionresult method that returns index view page to the user. In mvc all actions are performed through controller. We can follow the same steps for implementing action filters in an asp. Net mvc view as a word document 30 january, 2014 i often work with mvc teams and notice that everyone shudders when printable reports are mentioned, especially when you need to export to programs like microsoft word. An introduction to actionresults in mvc dot net concept.
Net core is an opensource, crossplatform framework for building modern, cloudbased web apps on. After a highspeed ramp up, the book presents over 25 concise chapters exploring key topics like validation, routing, and data access. This is because it is the abstract base class for other types of actions. As you can see in the above table, view method returns viewresult, content method returns string, file method returns content of a file and so on. And the code for action method using fileresult type is as follows. The answer is, choosing a derived type for a specific result is a good practice. Part 78 different types of actionresult in asp net mvc. Asp mvc learn asp net mvc 5 asp net mvc 5 tutorial. In such a case, its common to mix an actionresult return type with the primitive. Ive been busily using actionresult for almost everything but i know thats not correct and that i should be using more specific action results.
Writing our own action methods is crucial to our mvc application development as we will be addingediting our own functionality by adding editing these action. Mvc understanding action filters the goal of this tutorial is to explain action filters. Oct 25, 20 this article is the fourth in the mvc basic site series, and presents in detail jqgrid integration in mvc 4. We will also see about the different types of file action results that helps to return files from the server and even we created a custom file action result. Net core is an opensource, crossplatform framework for building modern, cloudbased web apps on windows, macos, and linux. Ill focus primarily on how to unit test the model state validation that is performed by asp. As you saw in chapter 2, a controller is one of the core components of an. Mvc assembly, then you can download after clicking here.
Writing a custom file download action result for asp. Definition action result is a result of action methods or return types of action methods. Each topic is illustrated with its own example so its easy to dip into the book without reading in sequence. Net mvc, you know how important the actionresult class is. All of these action results inherit from the base actionresult class. We have discussed implementing action filter in detail in the article section. Aug 15, 20 in this video, we will discuss different types of actionresult objects that can be returned by an action method. The controller action methods are expected to return the results to the client. The above diagram describes the abstract class of action result. To illustrate, imagine that entity framework ef core is being used for the web apis.
In case you are a newbie to polymorphism, lets do a quick revision. Net mvc is the tool of choice for building modern, dynamic, and scalable web applications. Net mvc 4 is a framework for building scalable, standardsbased web applications using wellestablished design patterns and the power of as. Another overload will specify a download name, and using this overload causes the browser to download the file, rather than just display it. Net mvc in the controller when the model is bound to a controller action. Net mvc provides a simple and versatile means of returning different types of response to the browser. Getmimemappingstring filename to get the mimetype for your file. Net core offers the following options for web api controller action return types. So, i was really getting annoyed with the results i was getting. It help us to return models to views, other return value, and also redirect to another controllers action method.
Any action in an mvc controller, generally speaking, returns an. There are plenty of action results are available according to need but all action results are inherited by actionresult class. Actions typically have a onetoone mapping with user interactions. If you think that your question was wrongfully closed as duplicate, then you have to edit your question and explain why it is different. Net core mvc controllers and web api controllers are unified.
Every action methods can have input parameters as normal methods. Net mvc action methods are responsible to execute requests and generate responses to it. These actionresults are responsible for returning content to the. The response for the browser is generated and written to the output stream by. Net mvc 4, so youll get full coverage of features such as the razor view engine, web matrix helpers, and improved extensibility. The posted files are available as parameters directly in actions through model binding. Download the files as a zip using the green button, or clone the repository to your machine using git. You dont need to have special camera for that all you need is action. The above code means that you are returning a viewresult object and due to polymorphism, this object is automatically type casted to the parent class type, i. Although standard action results filecontentresult and filestreamresult may be used for downloading files that are generated on the fly, creating a custom action result might be the best solution. Each action method has a return type and we call it as action result. There are many derived actionresult types in mvc that we use to return the result of a controller method to. Net mvc 4 is a framework for developing highly testable and maintainable web applications that follow the modelview controller mvc pattern.
Want to serve a pdf file with dynamicallygenerated content. Net mvc framework can be extended using the custom action filter to play videos. Browse other questions tagged ajax mvc 4 download actionresult or ask your own question. Usually these reports are embedded into html page and used along with devexpressreportviewer. After calling the action method in browser, the file will ask for download as shown in below. To view the data, download the file, controller should respond for it i. Action results return the result to view the page for the given request. Along the way, ill discuss the implementation of custom action result types. Now you can cut out the background, while recording with your webcam, from your video recording. Net mvc 4 in action is a fastpaced tutorial designed to introduce asp. An actionresult is a return type of a controller method in mvc. Net mvc, controllers define action methods and these action methods generally have a onetoone relationship with ui controls, such as clicking a button. Aug 15, 2012 uploading and returning files in an asp.
But before we dive into these new concepts, lets quickly recap the purpose of controllers and actions. This time, ill cover how to unit test view models in asp. Its a class that contains one or more public methods actions. As a programmer, we need to use different action results to get the expected output. Mvc basic site is developed using an incremental and iterative methodology, this means that each new step adds more functionalities to the solution from the previous step, so the. This article is the fourth in the mvc basic site series, and presents in detail jqgrid integration in mvc 4.
Why there is contentresult data type in the action method. I cant believe that something so simple as returning file or content in an mvc 4 mobile application controller would have been missed. Nov 01, 2014 so when you see mvc controller and action codes as shown below. Since mvc follows conventionoverconfiguration, mvc will look for a view. This class encapsulates the result of an action method and is used to perform a frameworklevel operation on behalf of the action method. Here, in this article we will learn about differences between them. Net mvc 4 is a framework for developing highly testable and maintainable web applications that follow the modelviewcontroller mvc pattern. Net mvc 4 is a framework for developing highly testable and maintainable web applications that follow the model view controller mvc pattern. A programmer uses different action results to get expected output. We will also see how we can apply validations to the posted files easily using view models. If we look at the homecontroller that comes with a default mvc project, we see some action methods already created. In most cases, a controller action returns a viewresult. Mar 20, 2019 an action result is the standard result from an action.
Each action result returns a different format of output. By default, it generates a response in the form of actionresult. It is actually a very simple class having only one method that needs implementing. Net mvc provides a simple and versatile means of returning different. Net developers and show how to apply it effectively.
In this chapter, we will clear the concept of action methods in mvc. The framework encourages you to maintain a clear separation of concerns views for ui, controllers for handling user input, and models for domain logic. It is the base class for all type of action results. The files in the server can be easily sent as response to the clients through its rich support of action results. Net mvc action results and pdf content simple talk. Net mvc 2 in action is a fastpaced tutorial designed to introduce the mvc model to asp. Well look at most of the builtin actionresult types in this lesson. The linked article shows how to implement an action filter in an asp. Let us see the available action results in the controllers asp.
Any action in an mvc controller, generally speaking, returns an actionresult. Action results in the controllers mvc4 when ever we create a controller. An action result is the standard result from an action. Each action result returns a different format of the output. However, lately i have been asked to open a report as a pdf file, without putting a viewer. To understand this, you have to understand the data types in asp. Use different methods mentioned in the above table, to return different types of results from an action method.
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