嘗試從Azure檢索數據時出現MobileServiceInvalidOperationException

Question

這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);
}

這是患者實體。

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; }
}

這是我遇到的錯誤。

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

當我將方法包裝在TryCatch中時，我收到此消息

Error : The request could not be completed.  ()

這是堆棧錯誤消息

    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()

需要注意的幾點。

1. Anybody with the Application Key將權限設置為Anybody with the Application Key
2. 我已添加對Windows Azure Mobile Services Managed Client引用
3. 我已經將此代碼插入App.XAML.CS中。 using Microsoft.WindowsAzure.MobileServices;
4. 我已經將從本網站獲得的這段代碼放在App.XAML.CS中。
   public static MobileServiceClient MobileService = new MobileServiceClient( AppUrl, AppKey );

為什么我無法連接到數據庫？ 我試過在Windows Store應用程序上運行這些代碼，並且可以正常工作。 以前我做過完全相同的事情，而且效果也很好。

Answer 1

這個鏈接救了我。

顯然，我要做的就是將服務地址從https更改為http 。 所以代替這個

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

更改為

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

問題解決了。

Answer 2

檢查計算機或設備上的日期/時間。 以我為例，我打開了已經關機了一段時間的開發電話，並且日期/時間完全錯誤。 雖然將端點從HTTPS更改為HTTP確實可以解決該問題，但對我而言，正確的解決方案是保留HTTPS並修復設備上的日期/時間。

Answer 3

我在Android設備中解決了此問題。 您將需要殺死您的應用程序實例，將系統日期/時間更改為當前日期，然后重新打開應用程序。

謝謝納撒尼爾·伍爾斯！

Answer 4

由於聲譽低下，我無法發表評論，我也遇到了同樣的問題，但是並不一致。

如果我嘗試使用我的應用程序中的注冊頁面打了Azure移動服務，有時它會因相同的錯誤而超時（“請求無法完成。（）”），那么如果我立即重試，它就可以正常工作。

我使用的是實際的Windows Phone設備，並且使用iPhone熱點（實際上是4G）提供的Wi-Fi進行連接，因此絕對沒有連接問題。

我讀過其他文章，說沒有必要嘗試檢查Internet連接是否可用，只是嘗試發送數據並處理任何問題。 我處理了這個問題，但是這個問題應該不會發生。

您還有其他問題嗎？

我已經嘗試過將https和http用於MobileService連接，似乎沒有任何區別。

Answer 5

萬一其他人遇到這個問題，當我只是簡單地將一個帶有錯誤子域的URL傳遞給MobileServiceClient時，我就會遇到相同的問題。

例如，如下所示：

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

Answer 6

確保此功能也已關閉。