The OnPost() handler method is invoked when a POST request is sent to a page. This usually happens when a user submits a form (an HTML <form> element).

Just like with OnGet(), the default behavior of an empty OnPost() method is to send the corresponding page. Without a return statement, this method also returns void.

public void OnPost() { }

Usually POST requests come with some information in the form of a query string. For example, say that a form at www.library.com/favorite asks for a book and an author:

<form method="post"> <div class="form-group"> <label for="Title">Title</label> <input type="text" class="form-control" id="Title" name="Title"> </div> <div class="form-group"> <label for="Author">Author</label> <input type="text" class="form-control" id="Author" name="Author"> </div> <button type="submit" class="btn btn-primary">Submit</button> </form>

Notice that each <input> has a name attribute — Title and Author, respectively.

In a browser it would look like:


If a user provided the input Where The Wild Things Are and Maurice Sendak, the URL would look like this (+ represents a space):


OnPost() can capture the values in the query string via matching method parameters. To capture the above values, the method would look like this:

public void OnPost(string title, string author) { Title = title; Author = author; }

Those method parameters are matched case-insensitively; author or Author or aUTHOR would have worked.



Create a form by copying and pasting this code into Index.cshtml:

<form method="post"> <div class="form-group"> <label for="Title">Title</label> <input type="text" class="form-control" id="Title" name="Title" placeholder="Title"> </div> <div class="form-group"> <label for="Date">Date</label> <input type="date" class="form-control" id="Date" name="Date"> </div> <div class="form-group"> <label for="Body">Your post</label> <textarea class="form-control" id="Body" name="Body" rows="3"></textarea> </div> <button type="submit" class="btn" id="submit">Submit</button> </form>

The place to paste is denoted with comments.

If done correctly, submitting the form will a produce a query string with the values: Title, Date, and Body. For example:


In Index.cshtml.cs, modify the OnPost() method by adding matching method parameters.

They should match the name attributes used in the <form>.


Within the method, assign each value to its corresponding property.

If done correctly, you can submit the form and see your data displayed on the page.

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