Question

我正在编写一个Windows Phone 8.1商店应用程序，以帮助管理我的小镇的公共交通工具，作为我的大学项目。

教授让我创建这个实现Web服务和SQL数据库的应用程序。

经过一番研究后，我决定将Windows Azure与SQL数据库结合使用。数据库只包含一个保存公交车站的简单表（每个公交站都有一个Id，Name，Latitude和Longitude）。

如果我执行查询，结果没有问题。然而，问题开始然后我尝试将我的项目连接到Web服务＆amp;相关的数据库。

我按照Microsoft教程中的建议在项目中创建了che客户端，如下所示：

public static Microsoft.WindowsAzure.MobileServices.MobileServiceClient RapalloBusClient = new Microsoft.WindowsAzure.MobileServices.MobileServiceClient(
        "https://<mywebservicename>.azure-mobile.net/",
        "xxxxxxxxxxxxxxxxxxxxxxxxxxxx");

执行此操作Visual Studio为我的解决方案添加了另一个名为<mywebservicename>MobileService的项目，它在DataObjects文件夹中有一个类Todoitem.cs，在Controllers文件夹中有一个TodoitemController.cs。

然后我为我的解决方案修改了这些类。

现在测试我是否做得很好我尝试在我的数据库的所有元素的ListBox中打印（实际上只有一个：Id = 1的公共汽车站，名称及其坐标）。

我使用的代码是（fermate =意大利语的公共汽车站）：

MobileServiceInvalidOperationException exception = null;
try
{
     fermate = await fermateTable.ToCollectionAsync();
}
catch (MobileServiceInvalidOperationException ex)
{
    exception = ex;
}

if (exception != null)
{
    await new MessageDialog(exception.Message, "Error loading items").ShowAsync();
}
else
{
    lstBox.ItemsSource = fermate;
}

此代码生成错误（“内部服务器错误”或“未找到”），我无法弄清楚错误的位置。

我正在使用以下链接https://azure.microsoft.com/en-us/documentation/articles/mobile-services-dotnet-backend-windows-universal-dotnet-get-started-data/中的教程，并附带解决方案，我没有任何问题

编辑：

我使用visual studio中<mywebservicename>MobileServiceMobile项目的设置menù将移动服务连接到数据库（在“Pubblicazione / Creazione pacchetto SQL”部分（意大利语）中）我检查说“从中提取数据/模式”的选项现有数据库“从Azure提供数据库URL。”

我删除了断点，让app运行，但是当我执行以下行时，我运行异常：

fermate = await fermateTable.ToCollectionAsync();

表示如下：

Microsoft.WindowsAzure.MobileServices.MobileServiceInvalidOperationException non è stata gestita dal codice utente
  HResult=-2146233079
  Message=The request could not be completed.  (Internal Server Error)
  Source=Microsoft.WindowsAzure.Mobile
  StackTrace:
       at Microsoft.WindowsAzure.MobileServices.MobileServiceHttpClient.<ThrowInvalidResponse>d__18.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 Microsoft.WindowsAzure.MobileServices.MobileServiceHttpClient.<SendRequestAsync>d__1d.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.MobileServiceHttpClient.<RequestAsync>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 Microsoft.WindowsAzure.MobileServices.MobileServiceTable.<ReadAsync>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.<ReadAsync>d__7.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.Query.MobileServiceTableQueryProvider.<Execute>d__8`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.Query.MobileServiceTableQueryProvider.<Execute>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.MobileServiceCollection`2.<ProcessQueryAsync>d__6.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.MobileServiceCollection`2.<LoadMoreItemsAsync>d__c.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.MobileServiceCollectionExtensions.<ToCollectionAsync>d__0`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 AppBus.CustomImagePage.<AppBarButton_Click>d__1e.MoveNext()
  InnerException:

Answer 1

我怀疑这是服务器上的实体框架问题。如果架构与预期的架构不匹配，服务器将抛出数据操作。您是否修改了与表关联的DbContext？

您需要确保服务器具有数据库模式的模型（您修改的TodoItem.cs），并且实体框架能够适当地解析它。请参阅此教程以使用现有SQL数据库：https://azure.microsoft.com/en-us/documentation/articles/mobile-services-dotnet-backend-use-existing-sql-database/

您可以做的一件事就是尝试在没有客户端的情况下访问您的终端。如果您使用Fiddler / Postman或类似的，您可以在/ tables / fermate上尝试HTTP GET或POST，以查看fermate TableController代码是否与您的实际数据库一起使用。您也可以使用＆＃34;立即尝试＆＃34;链接在根页面上，以便您的服务发送测试呼叫。如果提示输入密码，通常是您的应用程序密钥（无用户名）。

将Windows Phone 8.1 Store应用程序连接到现有Azure SQL数据库

1 个答案: