Upload files with web browser c#

Question

I am developing a process automation system, where my client’s supplier website has a part that needs file uploading. All automation is already developed, missing only this part. I’ve searched several forums, and they all present the solution using Sendkeys. This does not work in my case, was there will be more instances of the robot running on the same machine, and will also have humans using that computer.

I found this project in the codeproject https://www.codeproject.com/articles/28917/setting-a-file-to-upload-inside-the-webbrowser-com. But it didn’t work for me either.

In short

Upload file to a component input type file via web browser, without using Ndkeys.

Sample html

<form id="frmArq" name="frmArq" method="post" enctype="multipart/form-data" action="./outage_upload.php" target="upload_target">
<input type="file" id="arqEvid" name="arqEvid" value="0">
<input type="hidden" id="id_ticket" name="id_ticket" value="7539371">
<input type="submit" value="Enviar"></form>

Answer 1

I believe you can get around the webbrowser when sending the file.

From what I saw, the URL outage_upload.php awaits a request by POST that sends the file as a parameter. That is, you can send a request directly to that URL, stating the bytes of that file.

I found a similar answer here: https://stackoverflow.com/a/19664927/4713574 and changed it to your context.

Try to do so:

private System.IO.Stream Upload(string actionUrl, string id_ticket, byte [] file)
{
    HttpContent stringContent = new StringContent(id_ticket);
    HttpContent bytesContent = new ByteArrayContent(file);
    using (var client = new HttpClient())
    using (var formData = new MultipartFormDataContent())
    {
        formData.Add(id_ticket, "id_ticket", "id_ticket");
        formData.Add(file, "arqEvid", "arqEvid");
        var response = client.PostAsync(actionUrl, formData).Result;
        if (!response.IsSuccessStatusCode)
        {
            return null;
        }
        return response.Content.ReadAsStreamAsync().Result;
    }
}

I had no way of testing whether this will really work, and because I’m creating a robot that aims to send these images, I think it can be done that way, coming out of webbrowser.

I hope I’ve helped.