C#: Open a browser and POST to a url from a windows desktop app
I have a small WPF app (although I guess it doesn't really matter whether it's a wpf form or a webform app?) that I want to have launch a new browser window and POST to a specific url. I've been messing around with:
System.Diagnostics.Process.Start("http://myurl.com");
to launch the window but I don't think I can use the same process to actually post to a url...I've also experime开发者_运维技巧nted with HttpWebRequest but I would like the user to be able to use the app after I have posted to this url, not just show them the results...What can I look at to able to do something like this?
There is no direct way to do it. What you could do is generate a HTML page with a form filled with the data you need to post, and a bit of javascript to post the page automatically when it is loaded. Then you just have to open that page in the browser...
The generated HTML could look like that :
<html>
<head>
<script language="Javascript">
function submitForm() {
var theForm = document.getElementById("theForm");
theForm.submit();
}
</script>
</head>
<body onload="submitForm()">
<form id="theForm" action="http://myurl.com" method="POST">
<input type="text" name="username" value="myusername"/>
<input type="password" name="password" value="mypassword"/>
</form>
</body>
</html>
If the page must be displayed in your application, load it in a WebBrowser control
Use the WebBrowser Class instead.
There are multiple solutions, not sure which one would be the best for you...
- Proceed with your original approach
- Embed web browser control in your applicaiton as suggested in other answers
- Do everything programmatically "behind the scene"
For #3 you may want to look here: http://geekswithblogs.net/rakker/archive/2006/04/21/76044.aspx
If you want to go with #1 - it is more tricky, since you need to control external application and different browsers would behave differently.
I've used "javascript:" protocol and the code below with IE as default browser when dealing with one "user-unfriendly" application. Please note that it's not "production-ready" code. There is no error handling, user may shift focus away from launched browser, or use browser without "javascript:" protocol support etc.
static void Main()
{
Settings s = Settings.Default;
Process.Start(s.URL1);
Thread.Sleep(s.Delay1);
SendKeys.SendWait("%D");
Thread.Sleep(100);
SendKeys.SendWait(EncodeForSendKey(s.URL2));
SendKeys.SendWait("{ENTER}");
}
public static string EncodeForSendKey(string value)
{
StringBuilder sb = new StringBuilder(value);
sb.Replace("{", "{{}");
sb.Replace("}", "{}}");
sb.Replace("{{{}}", "{{}");
sb.Replace("[", "{[}");
sb.Replace("]", "{]}");
sb.Replace("(", "{(}");
sb.Replace(")", "{)}");
sb.Replace("+", "{+}");
sb.Replace("^", "{^}");
sb.Replace("%", "{%}");
sb.Replace("~", "{~}");
return sb.ToString();
}
- URL1: http://www.google.com
- URL2: javascript:function x(){document.all.q.value='stackoverflow';document.forms[0].submit();} x();
You can create a hidden WebBrowser control and do Navigate() (using the overload that allows you to specify the request method). You will need to specify a "_blank" target frame to cause the navigation to happen in a new browser window.
加载中,请稍侯......
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