Run a script with API call from a webpage using C#

Question

I want to run a script using API calls in C#. I don't want the webpage to open and just the script should run. I am trying this:

HttpWebRequest request = WebRequest.Create(URL) as HttpWebRequest;
HttpWebResponse response = request.GetResponse() as HttpWebResponse;

HtmlDocument doc; //I have tried HtmlDocument = new HtmlDocument();, didn't work.
var resultStream = response.GetResponseStream();
doc.LoadHtml(resultStream); // I have tried using Load instead of LoadHtml,didn't work out.
doc.InvokeScript("Submit");

I get an error, use of unassigned variable doc. and doc doesn't contain function name LoadHtml. I have adding the Microsoft.VisualStudio.TestTools.UITesting.HtmlControls; , didn't help.

I have checked th questions HtmlDocument.LoadHtml from WebResponse? and Get HTML code from website in C# but they didn't get an error on doc.

Any solutions.

Paulo Junior · Accepted Answer · 2016-11-03 18:52:21Z

1

You will have to change the way you load the HtmlDocument

string html = new WebClient().DownloadString(URL);
WebBrowser browser = new WebBrowser()
{
    ScriptErrorsSuppressed = true,
    DocumentText = string.Empty
};
HtmlDocument doc = browser.Document.OpenNew(true);
doc.Write(html);
doc.InvokeScript("Submit");

Hope it works.

edited Nov 3, 2016 at 18:52

answered Nov 3, 2016 at 18:08

Paulo Junior

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3 Comments

The Rookie Coder Over a year ago

I tried it, it gave an error that there is no constructor that accepts 0 arguments.

Paulo Junior Over a year ago

Are you using HTML Agility Pack?

Paulo Junior Over a year ago

Check the script name, remember the name is case sensitive. Does this script has any parameters? Maybe it is executing but not stopping due to validations. You may try to dump the html to make sure the script is there.

Dudemanword · Accepted Answer · 2016-11-03 18:32:40Z

HtmlDocument doc; //I have tried HtmlDocument = new HtmlDocument();, didn't work.

This won't work unless you do:

HtmlDocument doc = new HtmlDocument(/*someUri*/, /*documentLocation*/);

You need to initialize doc. This is why you are seeing

use of unassigned variable doc

Check out the documentation here for details:

https://msdn.microsoft.com/en-us/library/microsoft.visualstudio.testtools.webtesting.htmldocument.aspx

According to it, the constructor signature is:

HtmlDocument(Uri, String)

with the description:

Initializes a new instance of the HtmlDocument class. This constructor takes a >string and uses it as the document.

Also, by looking at the documentation, it doesn't have a method LoadHtml()

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