（C＃）天青 - 现场验证期间空引用异常 [英] (C#) Azure - Null Reference Exception during Live Authentication

问题描述

我也跟着在Azure移动服务网页上实时认证教程（的http://www.windowsazure.com/en-us/develop/mobile/tutorials/single-sign-on-windows-8-dotnet/)

，当我跑这条线code的

  LiveLoginResult结果=等待liveIDClient.LoginAsync（新[] {wl.basic}）;
 

我得到一个的NullReferenceException不管我做什么。我试图改变wl.basic到wl.signin，而且没有任何工作。

我签署了我的Microsoft帐户，我得到了弹出，使其能够登录，应用程序关联到我的dev的帐户，我已经添加客户端密钥和密码到我的蔚蓝帐户。
由于一吨的帮助大家！它的驾驶我疯了。下面是完整的code。如果它帮助。它没有获得通过行上述，我在MSDN上公布为好，只是想将计算器更有帮助。

 私人LiveConnectSession会议;
    私人异步System.Threading.Tasks.Task进行身份验证（）
    {
     LiveAuthClient liveIDClient =新LiveAuthClient（https://mobileserviceexample.azure-mobile.net/）;        而（会话== NULL）
        {            // TODO：增加了对多个Microsoft帐户进行测试。只适用于非关联帐户
            如果（liveIDClient.CanLogout）
            {liveIDClient.Logout（）; }            LiveLoginResult结果=等待liveIDClient.LoginAsync（新[] {wl.basic}）;
            如果（result.Status == LiveConnectSessionStatus.Connected）
            {}
 

例外：

  System.NullReferenceException是由用户code未处理
的HResult = -2147467261
消息=对象引用未设置到对象的实例。
来源= Microsoft.Live
堆栈跟踪：
   在Microsoft.Live.ResourceHelper.GetString（字符串名称）
   在Microsoft.Live.TailoredAuthClient＆LT; AuthenticateAsync＆GT; d__0.MoveNext（）
  ---从previous位置堆栈跟踪，其中引发异常的结尾---
   在System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（任务任务）
   在System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务）
   在System.Runtime.CompilerServices.TaskAwaiter`1.GetResult（）
   在Microsoft.Live.LiveAuthClient＆LT; ExecuteAuthTaskAsync＆GT; d__4.MoveNext（）
---从previous位置堆栈跟踪，其中引发异常的结尾---
   在System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（任务任务）
   在System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务）
   在System.Runtime.CompilerServices.TaskAwaiter`1.GetResult（）
   在CommunistTutsApp.HomePage＆LT;身份验证＆GT; d__0.MoveNext（）
---从previous位置堆栈跟踪，其中引发异常的结尾---
   在System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（任务任务）
   在System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务）
   在System.Runtime.CompilerServices.TaskAwaiter.GetResult（）
   在CommunistTutsApp.HomePage＆LT;＆的OnNavigatedTo GT; d__f.MoveNext（）
 

解决方案

我有同样发出─调用LoginAsync时对象引用不设置到对象的实例。
请确保您输入的重定向URL中的实时连接设置 - 见附件链路的步骤4
<一href=\"https://www.windowsazure.com/en-us/develop/mobile/how-to-guides/register-for-microsoft-authentication/\" rel=\"nofollow\">https://www.windowsazure.com/en-us/develop/mobile/how-to-guides/register-for-microsoft-authentication/

感谢您！

I followed the Live Authentication tutorial on the Azure Mobile Services page (http://www.windowsazure.com/en-us/develop/mobile/tutorials/single-sign-on-windows-8-dotnet/)

and when I run this line of code

LiveLoginResult result = await liveIDClient.LoginAsync(new[] { "wl.basic" });

I get a "NullReferenceException" no matter what I do. I tried changing "wl.basic" to "wl.signin" and that didn't work either.

I am signed into my Microsoft Account, I get the pop-up to allow it to login, the app is associated to my dev account, and I have added the client key and secret to my azure account. Thanks a ton for the help everyone! It's driving me crazy. Here's the full code if it helps. It doesn't get passed the line stated above and I posted on MSDN as well, just thought StackOverflow would be more helpful.

 private LiveConnectSession session;


    private async System.Threading.Tasks.Task Authenticate()
    { 
     LiveAuthClient liveIDClient = new LiveAuthClient("https://mobileserviceexample.azure-mobile.net/");

        while (session == null)
        {

            // TODO: Added for testing of multiple microsoft accounts. Only works on non-connected accounts
            if (liveIDClient.CanLogout)
            { liveIDClient.Logout(); }

            LiveLoginResult result = await liveIDClient.LoginAsync(new[] { "wl.basic" });
            if (result.Status == LiveConnectSessionStatus.Connected)
            {}

Exception:

System.NullReferenceException was unhandled by user code
HResult=-2147467261
Message=Object reference not set to an instance of an object.
Source=Microsoft.Live
StackTrace:
   at Microsoft.Live.ResourceHelper.GetString(String name)
   at Microsoft.Live.TailoredAuthClient.<AuthenticateAsync>d__0.MoveNext()
  --- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at Microsoft.Live.LiveAuthClient.<ExecuteAuthTaskAsync>d__4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task     task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at CommunistTutsApp.HomePage.<Authenticate>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task     task)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
   at CommunistTutsApp.HomePage.<OnNavigatedTo>d__f.MoveNext()

解决方案

I had the same issue- "Object Reference not set to the instance of an object" when calling LoginAsync. Make sure you have entered the Redirect URL in the Live Connect setup- see Step 4 of the attached link- https://www.windowsazure.com/en-us/develop/mobile/how-to-guides/register-for-microsoft-authentication/

Thank you!

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