Using HttpFormUrlEncodedContent

Question

I'm trying to use HttpFormUrlEncodedContent, in my HttpClient POST request but am unsure about the type of 'content' in the constructor.

The documentation say it needs to be type:

Type: IIterable<IKeyValuePair> [JavaScript/C++]

Which is the best datatype to use that implements this interface in JavaScript?

I've tried using propertyset -

    var properties = new Windows.Foundation.Collections.PropertySet();
    properties.insert('username', username);
    var data = new Windows.Web.Http.HttpFormUrlEncodedContent(properties);

But I get error, 'no interface supported'.

Answer 1

Which line throws the exception? 
Does it fail if you use an explicit new KeyValuepair?

properties.add (new KeyValuePair('username', username));

---

Matt Small - Microsoft Escalation Engineer - Forum Moderator
If my reply answers your question, please mark this post as answered.

NOTE: If I ask for code, please provide something that I can drop directly into a project and run (including XAML), or an actual application project. I'm trying to help a lot of people, so I don't have time to figure out weird snippets with undefined objects and unknown namespaces.

Answer 2

Im doing this in JavaScript, KeyValuePair doesn't exist.

The error is thrown on line

   var data = new Windows.Web.Http.HttpFormUrlEncodedContent(properties);

Answer 3

This one's a little funny (at least for JavaScript; the API is super simple in C#).  The jist is: the API technically works perfectly, but it requires an IIterable<IKeyValuePair>.  But there's no obvious datatype in JavaScript that you can use for one of those.  As you found out, a plain old object (which ideally would "just work") doesn't.

But there's a clever workaround!  All you have to do is find some object in the Windows Runtime that also supported that special interface.  And it turns out that there's one good candicate: a RequestHeaders object (!).

Here's some working code:

var keyValue = (new Windows.Web.Http.HttpClient()).defaultRequestHeaders;
keyValue["name"] = "Peter";
keyValue["office"] = "26/1167";
var c = new Windows.Web.Http.HttpFormUrlEncodedContent(keyValue);

And the super simple C# code?

var mymap = new Dictionary<string,string>() { {"name","Peter"}, {"office", "26/1667"}};
(warning: the C# code was typed by hand.)

---

Network Developer Experience Team (Microsoft)

Answer 4

This has been working great for me however I have discovered an issue. How do I set a key named 'location' ?

e.g.

           

var keyValue = new Windows.Web.Http.HttpClient().defaultRequestHeaders;
keyValue['location'] = 'home';

Throws the error:

0x80070057 - JavaScript runtime error: The parameter is incorrect.

Invalid HTTP headers.

WinRT information: Invalid HTTP headers.

How do I get around this?

Thanks

Answer 5

I think this is it:

http://msdn.microsoft.com/en-us/library/windows/apps/dn305252.aspx

var client= new Windows.Web.Http.HttpClient();

client.defaultRequestHeaders.Add("location","home");

---

Matt Small - Microsoft Escalation Engineer - Forum Moderator
If my reply answers your question, please mark this post as answered.

NOTE: If I ask for code, please provide something that I can drop directly into a project and run (including XAML), or an actual application project. I'm trying to help a lot of people, so I don't have time to figure out weird snippets with undefined objects and unknown namespaces.