OpenIdButton 的扩展返回空

Question

以下是我在vb.net中编写的代码。

受保护的子OpenIdButton3_LoggedIn（ByVal sender As Object，ByVal e As DotNetOpenAuth.OpenId.RelayingParty.OpenIdEventArgs）处理中的OpenIdButton 3.LoggedIn

OpenIdButton3.Visible=错误

Dim profile As ClaimsRespone=e.Response.GetExtension（索赔响应的）（）

将电子邮件Dim为String=配置文件。电子邮件

MsgBox（电子邮件）

结束子

但是线路

将电子邮件Dim为String=配置文件。电子邮件

正在给出以下错误。

异常详细信息：System.NullReferenceException：对象引用未设置为对象的实例。

我已经阅读了相关文档，并在webconfig中实现了AXFetchAsSregTransform。下面是显示相同内容的块。

<sectionGroup name="dotNetOpenAuth" type="DotNetOpenAuth.Configuration.DotNetOpenAuthSection, DotNetOpenAuth.Core">
  <section name="dotNetOpenAuth" type="DotNetOpenAuth.Configuration.DotNetOpenAuthSection" requirePermission="false" allowLocation="true" />
  <section name="openid" type="DotNetOpenAuth.Configuration.OpenIdElement, DotNetOpenAuth.OpenId" requirePermission="false" allowLocation="true" />
  <section name="oauth" type="DotNetOpenAuth.Configuration.OAuthElement, DotNetOpenAuth.OAuth" requirePermission="false" allowLocation="true" />
  <section name="messaging" type="DotNetOpenAuth.Configuration.MessagingElement, DotNetOpenAuth.Core" requirePermission="false" allowLocation="true" />
  <section name="reporting" type="DotNetOpenAuth.Configuration.ReportingElement, DotNetOpenAuth.Core" requirePermission="false" allowLocation="true" />
</sectionGroup>

><；dotNetOpenAuth>

<openid>
  <relyingParty>

      <add type="DotNetOpenAuth.OpenId.Behaviors.AXFetchAsSregTransform, DotNetOpenAuth" />
    </behaviors>
  </relyingParty>
</openid>

</dotNetOpenAuth>

即便如此，我似乎还是得到了空值。我正在从谷歌获得身份验证。

有人能帮我吗？

Answer 1

最后，我找到了解决方案。把它张贴在这里，这样其他面临同样问题的人可以得到帮助。

全球申报-如果你在当地申报，出于某种原因，它们似乎不起的作用

Dim relyingParty作为新的OpenIdRelying聚会

Dim authResponse As IAuthenticationResponse

声明后，在您的网页表单上创建一个按钮，允许用户登录谷歌。还有一个标签，显示登录用户的电子邮件id。

'在页面加载中放入以下代码。

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    Dim googleAppsDiscovery As New HostMetaDiscoveryService() With {.UseGoogleHostedHostMeta = True}
    relyingParty.DiscoveryServices.Insert(0, googleAppsDiscovery)
    authResponse = relyingParty.GetResponse()
    If authResponse IsNot Nothing Then
        If authResponse.Status = AuthenticationStatus.Authenticated Then
            Dim fetch As FetchResponse = authResponse.GetExtension(Of FetchResponse)()
            If fetch IsNot Nothing Then
                ' Save user details in session variables
                'Dim temp As [String]() = fetch.GetAttributeValue(WellKnownAttributes.Contact.Email).ToString().Split("@"c)
                Dim temp As String = fetch.GetAttributeValue(WellKnownAttributes.Contact.Email).ToString()
                If temp IsNot Nothing Then
                    Dim userName As String = temp
                    Label1.Text = "You are logged in as : " & userName
                End If
            End If
        End If
    End If
End Sub

在按钮的点击事件中放入以下代码

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
    Dim currentPageURL As String = curPageURL.ToString
    Dim urlRealm As New Uri(currentPageURL)
    Dim urlReturn As New Uri(currentPageURL)
    Dim rm As Realm = New Realm(urlRealm)
    Dim gIdentifier As String = "https://www.google.com/accounts/o8/id"
    Dim request As IAuthenticationRequest = relyingParty.CreateRequest(gIdentifier, urlRealm, urlReturn)
    Dim fetch As New FetchRequest
    fetch.Attributes.Add(New AttributeRequest(WellKnownAttributes.Contact.Email, True))
    request.AddExtension(fetch)
    request.RedirectToProvider()
End Sub

添加以下两个功能来获得您当前的URL

Function curPageURL() As String
    Dim s, protocol, port As String
    If Request.ServerVariables("HTTPS") = "on" Then
        s = "s"
    Else
        s = ""
    End If
    protocol = strLeft(LCase(Request.ServerVariables("SERVER_PROTOCOL")), "/") & s
    If Request.ServerVariables("SERVER_PORT") = "80" Then
        port = ""
    Else
        port = ":" & Request.ServerVariables("SERVER_PORT")
    End If
    curPageURL = protocol & "://" & Request.ServerVariables("SERVER_NAME") & _
          port & Request.ServerVariables("SCRIPT_NAME")
End Function
Function strLeft(ByVal str1 As String, ByVal str2 As String) As String
    strLeft = Left(str1, InStr(str1, str2) - 1)
End Function

你完了。