尝试从Azure检索数据时出现MobileServiceInvalidOperationException

Question

这是我正在使用的方法。

try
{
    List<Patient> pList = await App.MobileService.GetTable<Patient>().Where(
                patient => patient.id == 1).ToListAsync();
    foreach (Patient p in pList)
    {
        System.Diagnostics.Debug.WriteLine("{0}, {1}", p.id, p.first_name);
    }
}
catch (Exception err)
{
    System.Diagnostics.Debug.WriteLine("ERROR! : {0}", err.Message);
}

这是患者实体。

class Patient
{
    public int id { get; set; }
    public string first_name { get; set; }
    public string last_name { get; set; }
    public string middle_name { get; set; }
    public string nirc { get; set; }
    public int bed_id { get; set; }
}

这是我遇到的错误。

An exception of type 'System.Net.WebException' occurred in System.Windows.ni.dll and     wasn't handled before a managed/native boundary
An exception of type 'System.Net.WebException' occurred in System.Windows.ni.dll and wasn't handled before a managed/native boundary
An exception of type 'System.Net.WebException' occurred in mscorlib.ni.dll and wasn't handled before a managed/native boundary
An exception of type 'Newtonsoft.Json.JsonReaderException' occurred in Newtonsoft.Json.DLL and wasn't handled before a managed/native boundary
An exception of type 'Microsoft.WindowsAzure.MobileServices.MobileServiceInvalidOperationException' occurred in Microsoft.Azure.Zumo.WindowsPhone8.Managed.DLL and wasn't handled before a managed/native boundary
An exception of type 'Microsoft.WindowsAzure.MobileServices.MobileServiceInvalidOperationException' occurred in mscorlib.ni.dll and wasn't handled before a managed/native boundary
An exception of type 'Microsoft.WindowsAzure.MobileServices.MobileServiceInvalidOperationException' occurred in mscorlib.ni.dll and wasn't handled before a managed/native boundary
An exception of type 'Microsoft.WindowsAzure.MobileServices.MobileServiceInvalidOperationException' occurred in mscorlib.ni.dll and wasn't handled before a managed/native boundary
A first chance exception of type 'Microsoft.WindowsAzure.MobileServices.MobileServiceInvalidOperationException' occurred in mscorlib.ni.dll
An exception of type 'Microsoft.WindowsAzure.MobileServices.MobileServiceInvalidOperationException' occurred in mscorlib.ni.dll and wasn't handled before a managed/native boundary

当我将方法包装在TryCatch中时，我收到此消息

Error : The request could not be completed.  ()

这是堆栈错误消息

    at Microsoft.WindowsAzure.MobileServices.MobileServiceClient.CreateMobileServiceException(String errorMessage, IServiceFilterRequest request, IServiceFilterResponse response)
    at Microsoft.WindowsAzure.MobileServices.MobileServiceClient.ThrowInvalidResponse(IServiceFilterRequest request, IServiceFilterResponse response, JToken body)
    at Microsoft.WindowsAzure.MobileServices.MobileServiceClient.<RequestAsync>d__f.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.WindowsAzure.MobileServices.MobileServiceTable.<SendReadAsync>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.WindowsAzure.MobileServices.MobileServiceTable`1.<EvaluateQueryAsync>d__3`1.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.WindowsAzure.MobileServices.MobileServiceTableQuery`1.<ToListAsync>d__2.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 PhoneApp1.MainPage.<populate>d__0.MoveNext()

需要注意的几点。

1. Anybody with the Application Key将权限设置为Anybody with the Application Key
2. 我已添加对Windows Azure Mobile Services Managed Client引用
3. 我已经将此代码插入App.XAML.CS中。 using Microsoft.WindowsAzure.MobileServices;
4. 我已经将从本网站获得的这段代码放在App.XAML.CS中。
   public static MobileServiceClient MobileService = new MobileServiceClient( AppUrl, AppKey );

为什么我无法连接到数据库？ 我试过在Windows Store应用程序上运行这些代码，并且可以正常工作。 以前我做过完全相同的事情，而且效果也很好。

Answer 1

这个链接救了我。

显然，我要做的就是将服务地址从https更改为http 。 所以代替这个

public static MobileServiceClient MobileService = new MobileServiceClient( 
    "https://www.example.azure-mobile.net/", 
    "fjkdslajkfdlsref31321fgdsat34ajklfdslajfkldsa" 
);

更改为

public static MobileServiceClient MobileService = new MobileServiceClient( 
    "http://www.example.azure-mobile.net/", 
    "fjkdslajkfdlsref31321fgdsat34ajklfdslajfkldsa" 
);

问题解决了。

Answer 2

检查计算机或设备上的日期/时间。 以我为例，我打开了已经关机了一段时间的开发电话，并且日期/时间完全错误。 虽然将端点从HTTPS更改为HTTP确实可以解决该问题，但对我而言，正确的解决方案是保留HTTPS并修复设备上的日期/时间。

Answer 3

我在Android设备中解决了此问题。 您将需要杀死您的应用程序实例，将系统日期/时间更改为当前日期，然后重新打开应用程序。

谢谢纳撒尼尔·伍尔斯！

Answer 4

由于声誉低下，我无法发表评论，我也遇到了同样的问题，但是并不一致。

如果我尝试使用我的应用程序中的注册页面打了Azure移动服务，有时它会因相同的错误而超时（“请求无法完成。（）”），那么如果我立即重试，它就可以正常工作。

我使用的是实际的Windows Phone设备，并且使用iPhone热点（实际上是4G）提供的Wi-Fi进行连接，因此绝对没有连接问题。

我读过其他文章，说没有必要尝试检查Internet连接是否可用，只是尝试发送数据并处理任何问题。 我处理了这个问题，但是这个问题应该不会发生。

您还有其他问题吗？

我已经尝试过将https和http用于MobileService连接，似乎没有任何区别。

Answer 5

万一其他人遇到这个问题，当我只是简单地将一个带有错误子域的URL传递给MobileServiceClient时，我就会遇到相同的问题。

例如，如下所示：

 public static MobileServiceClient MobileService = new MobileServiceClient( "http://www.example.azure-mobile.net/", "fjkdslajkfdlsref31321fgdsat34ajklfdslajfkldsa" ); 

Answer 6

确保此功能也已关闭。