如何使用VB.Net通过Webbrowser将图像文件上传到网站

Question

I'm trying to fill website forms and I can do it with textbox, checkbox, radios, select-combobox, all by code but when I try to upload a image file I only can do it by keyboard pulsation simulation (SendKeys).

Is there any way to achieve it using only code? I need to know because I want that my application runs in background.

If its impossible by security reasons, can anybody show me a link with documentation explaining why?

Thank you all.

This is my working code to upload image:

 For Each elemento As HtmlElement In WebBrowser1.Document.GetElementsByTagName("input")
            If elemento.GetAttribute("name") = "ad_picture_a" Then
                elemento.Focus()
                SendKeys.SendWait("                 " & Form2.Label6.Text & "{TAB}" & "{TAB}" & "{ENTER}")
                Exit For
            End If
        Next

Answer 1

You can use the SetAttribute() method to set the value attribute of the input-tag.

elemento.SetAttribute("value", "                 " & Form2.Label6.Text & "\t\t\n")

\\t is the tab character, and \\n the a new line character (assuming that you are inputting them, if you are actually trying to move the focus and click something please give me more information about that object).