Can't get request form from HTML form

Question

I have a form in which I have several inputs, when I submit the form to process the information, when I try to read them I can't.

This is the form:

<form id="form1" action="page.aspx" method="get">
      <input type="text" name="idP" id="idP" value="123456789" />
...
        </form>

Then when I send it to "page.aspx" The url show the data:

localhost/page?idP=123456789

But when I try to read them from code as:

string[] keys = Request.Form.AllKeys;
            for (int i = 0; i < keys.Length; i++)
            {
                Response.Write(keys[i] + ": " + Request.Form[keys[i]] + "<br>");
            }

It doesn't print anything, and AllKeys shows as 0 values, I tried with "Post" method as well but nothing.

What I'm doing wrong?

You can get the value of `idP` with `Request.QueryString` – TheValyreanGroup Aug 16 '17 at 16:44 — TheValyreanGroup, Aug 16 '17 at 16:44

score 1 · Accepted Answer · 2017-08-16T17:24:41.520

Unlike POST and PUT, GET requests don't have a body¹, so form values must be sent via the query string. You can see this in your URI: localhost/page?idP=123456789.

So, you'll need to use something like:

var idP = Request.QueryString["idP"];

Request.Form pulls values from the request body. From the documentation:

The Form property is populated when the HTTP request Content-Type value is either "application/x-www-form-urlencoded" or "multipart/form-data".

If you look at the your request headers, you'll see that Content-Type a) is missing entirely, or b) isn't either of those. So, using it here isn't appropriate.

¹: Technically, GET requests can have a body, but per the HTTP specification, servers should ignore it. See this answer for more information.

Can't get request form from HTML form

1 Answers1