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ASP.NET MVC Forms

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Handling a Form Post

3:41 with James Churchill

Let’s see how to update our controller to handle a form post.

Follow Along

To follow along commiting your changes to this course, you'll need to fork the aspnet-fitness-frog repo. Then you can clone, commit, and push your changes to your fork like this: 

git clone <your-fork>
cd aspnet-fitness-frog
git checkout tags/v1.5 -b handling-a-form-post

Additional Learning

For more information about C# Attributes, see this page on MSDN.

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    While testing our ad entry form. 0:00
    We noticed that the entries controller isn't set up to process posts for 0:02
    the entries/add path. 0:06
    All MVC controllers inherit from the controller base class. 0:08
    Which provides a property named request that is of type HTTP request base. 0:13
    The request property provides us with information about the current request. 0:19
    Including the HTTP method. 0:23
    So, we can add some simple logic to check if the current request is a post. 0:25
    If and then Request.HttpMethod == and 0:30
    then POST, all in caps. 0:37
    And then let's add an else. 0:42
    While this approach would work, MVC gives us the tools that we need 0:46
    to define an action method for each HTTP verb that we need to support. 0:49
    We start by adding a second action method. 0:55
    I'll copy and paste the add method. 0:57
    A class can't have two methods with the same name and parameter signature. 1:05
    So I'll change the name of the new method to AddPost. 1:09
    But changing the name will keep MVC from being able to route Post to 1:15
    this method for the entries/add path. 1:20
    We can fix this by using an attribute. 1:23
    Attributes provide a way of associating information with our C# code. 1:26
    Instead of writing programming instructions using code statements, 1:30
    we can simply label or decorate our code with attributes. 1:34
    Attributes can be associated with classes, properties or methods. 1:38
    To associate an attribute with our method, we simply add a pair of brackets just 1:43
    above the method and type the name of the attribute, ActionName, 1:48
    followed by a set of parentheses if the attribute requires any parameter values. 1:53
    The ActionName attribute allows us to define the name of the action, 1:58
    past here as a parameter value that should be associated with this method. 2:02
    We could add another attribute, HttpPost to indicate that this method 2:07
    should only be associated with post requests. 2:12
    There are 2 ways that we could add multiple attributes. 2:14
    We can, stack them up, like this, or we can list 2:18
    multiple attributes inside a single set of brackets by separating them with commas. 2:22
    Let's test our new action method by putting a break point in 2:28
    each add method and running our app. 2:31
    Here's the Get request for the add entry page. 2:44
    Press F5 to continue, enter 1/1/2016 for 2:47
    the Date field value and click the Save button. 2:52
    And now we're in the add post method. 2:56
    Having separate action methods for Get and 2:59
    Post requests will help keep our code clean and more maintainable. 3:01
    Go ahead and stop the app. 3:05
    If you're using GitHub, let's commit our changes. 3:09
    Enter a commit message of, 3:17
    Added EntriesController Add POST action method. 3:20
    And click the Commit All button. 3:27
    Next, we'll see how we can use an NPC feature called Model binding to capture 3:33
    our forms post data. 3:38

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