vb.net登录网站

Question

我想通过我的VB.net程序登录Rueters.com 。 到目前为止，我的代码一直有效，直到我点击“登录”按钮。 没有错误发生，但它也没有登录。 我究竟做错了什么？ 在此先感谢您的帮助。

Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    WebBrowser1.Navigate("https://commerce.us.reuters.com/login/pages/login/login.do?backUrl=http%3A%2F%2Fwww.reuters.com%2F&backParameterEncoded=false&source=portfolio&flow=PORTFOLIO&entry_source=registration")
End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
    WebBrowser1.Document.GetElementById("loginName").SetAttribute("value", "username")
    WebBrowser1.Document.GetElementById("password").SetAttribute("value", "password")

    Dim allelements As HtmlElementCollection = WebBrowser1.Document.All

    For Each webpageelement As HtmlElement In allelements

        If webpageelement.GetAttribute("class") = "button" Then

            webpageelement.InvokeMember("click")

        End If

    Next
End Sub

对不起，我忘了包含HTML！ 这里是：

<div class="label">
    Email</div>
  <div class="textfield">
    <input type="text" size="40" maxlength="100" name="loginName" value="username" />
  </div>
  <div class="label">
    Password</div>
  <div class="textfield">
    <input type="password" value="" size="40" maxlength="20" name="password" />
  </div>

  <div class="checkbox">
    <input type="hidden" value="true" name="flag" /> 
    <input type="checkbox" onclick="if(this.checked) this.form.flag.value='true'; else this.form.flag.value='false';" id="RememberCredentialsCBID" checked="checked" /> 
    <label class="label"  for="RememberCredentialsCBID">Remember me on this computer</label>
  </div>
  <div id="loginErr" class="label error">
  </div>  
  <div class="submit">
    <div class="button"><input type="image" src="/resources_v2/images/btn_sign_in.gif" />
  </div>
</div>
<div class="textfield">
       <a href="/login/restorePassword">Forgot your password?</a>
     </div>
  </form>

Answer 1

怎么样：

WebBrowser1.Document.GetElementById("loginName").SetAttribute("value", "username")
    WebBrowser1.Document.GetElementById("password").SetAttribute("value", "password")

    Dim allelements As HtmlElementCollection = WebBrowser1.Document.All

    For Each webpageelement As HtmlElement In allelements

        If webpageelement.GetAttribute("type") = "image" Then
            If webpageelement.GetAttribute("src") = "https://commerce.us.reuters.com/resources_v2/images/btn_sign_in.gif" Then

                webpageelement.InvokeMember("click")

            End If
        End If

    Next