OpenIdButton 的扩展返回 null

Question

以下是我用 vb.net 编写的代码。

受保护的子 OpenIdButton3_LoggedIn(ByVal sender As Object, ByVal e As DotNetOpenAuth.OpenId.RelyingParty.OpenIdEventArgs) 处理 OpenIdButton3.LoggedIn

OpenIdButton3.Visible = False

Dim profile As ClaimsResponse = e.Response.GetExtension(Of ClaimsResponse)()

Dim email As String = profile.Email

消息框（电子邮件）

结束子

但线

Dim email As String = profile.Email

出现以下错误。

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

我已阅读相关文档，并在 webconfig 中实现了 AXFetchAsSregTransform。以下是显示相同的块。

<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>

>

<openid>

  <relyingParty>

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

    </behaviors>

  </relyingParty>

</openid>

即便如此，我似乎也得到了空值。我正在从 Google 获得身份验证。

谁能帮我解决这个问题？

Answer 1

最后，我找到了解决方案。将其发布在这里，以便其他面临相同问题的人可以得到帮助。

'全局声明 - 如果您在本地声明它们，出于某种原因，它们似乎不起作用

将依赖方调暗为新的 OpenIdRelyingParty

将 authResponse 调暗为 IAuthenticationResponse

声明后在您的网络表单上创建一个按钮，该按钮将允许用户登录 Google。还有一个标签，将显示已登录用户的电子邮件 ID。

'在页面加载时添加以下代码。

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加入如下代码

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

添加以下两个函数来获取您当前的网址

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

你就完成了。