How to pass string value from WidowsForm to ASP.NET MVC Controller

Question

I have seen couple of similar post but none of them resolved my problem, hence I am posting again.

I am trying to pass my WindowsForm data to a asp.net MVC controller.

But at controller I am receiving null value. How can I pass my windows form value (text value) to my controller? Kindly help.

Here are my codes:

Windows form code:

private void send_button_Click(object sender, EventArgs e)
    {
        if (!string.IsNullOrEmpty(textBox1.Text))
        {
            var dataBytes = System.Text.Encoding.UTF8.GetBytes(textBox1.Text);

            HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create("http://localhost:61174/Home/DataFromWinForm");
            httpWebRequest.ContentType = "application/x-www-form-urlencoded";
            httpWebRequest.ContentLength = dataBytes.Length;
            httpWebRequest.Method = "POST";

            using (var dataStream = httpWebRequest.GetRequestStream())
            {
                dataStream.Write(dataBytes, 0, dataBytes.Length);
            }


            HttpWebResponse response = (HttpWebResponse)httpWebRequest.GetResponse();
            if (response.StatusCode == HttpStatusCode.OK)
            { starts_label.Text += "Posted";
                textBox1.Text = null;
            }

        }
    }

And here is my controller: by Start method I am opening my windowsform application and trying to pass windows form text to my controller's DataFromWinForm method

public class HomeController : Controller
{
    public IActionResult Index()
    {
        return View();
    }
    public IActionResult Start()
    {
        var appLocation = @"C:\Users\RFIDReader\bin\Debug\RFIDReader.exe";
        Process test = new Process();
        test.StartInfo.FileName = appLocation;
        test.Start();

        return View("Index");
    }
    [HttpPost]
    public IActionResult DataFromWinForm(string receivedData)
    {
        //My code goes here
        return View();
    }}

But when my breakpoint hits at my controller I am getting null value

Gökten Karadağ · Accepted Answer · 2019-10-02 18:27:15Z

1

Change this

 var dataBytes = System.Text.Encoding.UTF8.GetBytes(textBox1.Text);

to this

 var postData = HttpUtility.UrlEncode("receivedData") + "=" + HttpUtility.UrlEncode(textBox1.Text);
 var dataBytes = System.Text.Encoding.UTF8.GetBytes(postData);

answered Oct 2, 2019 at 18:27

Gökten Karadağ

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1 Comment

user2019 Over a year ago

Thank You @Gökten Karadağ :) I have modified your code a little. I have used "WebUtility" from "System.Net" Namespace instead of "HttpUtility" Cheers!

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