在VS（C＃）中打开文件对话框时如何设置文件

Question

I have a software that clicks the button 'Add photo':

private void OpenOpen()
        {

            var elems = webBrowser1.Document.GetElementsByTagName("input");

            foreach (HtmlElement elem in elems)
            {

                if (elem.GetAttribute("type") == "file")
                {

                    elem.InvokeMember("click");
                    break;
                }
            }

After this the file dialog window popups: choose file

The question is: how to set the filepath through this dialogbox? The html code of the button is:

<input type="file" accept="video/*,  video/x-m4v, video/webm, video/x-ms-wmv, video/x-msvideo, video/3gpp, video/flv, video/x-flv, video/mp4, video/quicktime, video/mpeg, video/ogv, image/*" name="composer_photo[]" display="inline" role="button" tabindex="0" class="_n _5f0v" id="js_56">

Thanks a lot

Answer 1

As per my understanding, you need to set a default path. You could try to use the below code:

private void OpenOpen()
    {

        var elems = webBrowser1.Document.GetElementsByTagName("input");

        foreach (HtmlElement elem in elems)
        {

            if (elem.GetAttribute("type") == "file")
            {

                elem.SetAttribute("value", "D:\your_file.txt");
                break;
            }
        }