“Microsoft.WindowsAzure.Storage.CloudStorageAccount”的类型初始值设定项在Xamarin.forms中引发了异常错误

Question

I'm working on AzureStorage cloud solution provided by Xamarin. https://developer.xamarin.com/guides/xamarin-forms/cloud-services/storage/azure-storage/

And this is what I got in GetContainer() method.

The type initializer for 'Microsoft.WindowsAzure.Storage.CloudStorageAccount' threw an exception

I applied my connection string in the sample project and it worked, but not in my own project.

Has anyone ever faced this issue? Please help me.

Thanks in advance.

Error message :

System.TypeInitializationException: The type initializer for 'Microsoft.WindowsAzure.Storage.CloudStorageAccount' threw an exception. ---> System.NotImplementedException: The method or operation is not implemented.
 at Microsoft.WindowsAzure.Storage.CloudStorageAccount.Setting (System.String name, System.String[] validValues) [0x00000] in <667a5fa37f124e50ab7a68ecb3437b13>:0
 at Microsoft.WindowsAzure.Storage.CloudStorageAccount..cctor () [0x00000] in <667a5fa37f124e50ab7a68ecb3437b13>:0
 --- End of inner exception stack trace ---
 at MyTenantWorld.AzureStorage.GetContainer (MyTenantWorld.ContainerType containerType) [0x00020] in <9816076ee17d42efaf1050c5169a4310>:0
 at MyTenantWorld.AzureStorage+<UploadFileAsync>d__3.MoveNext () [0x0001a] in <9816076ee17d42efaf1050c5169a4310>:0
 at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in <3fd174ff54b146228c505f23cf75ce71>:0
 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x0003e] in <3fd174ff54b146228c505f23cf75ce71>:0
 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in <3fd174ff54b146228c505f23cf75ce71>:0
 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in <3fd174ff54b146228c505f23cf75ce71>:0
 at System.Runtime.CompilerServices.TaskAwaiter`1[TResult].GetResult () [0x00000] in <3fd174ff54b146228c505f23cf75ce71>:0
 at MyTenantWorld.SettingsPage+<SaveData>d__20.MoveNext () [0x00309] in <9816076ee17d42efaf1050c5169a4310>:0
 at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in <3fd174ff54b146228c505f23cf75ce71>:0
 at System.Runtime.CompilerServices.AsyncMethodBuilderCore+<>c.<ThrowAsync>b__6_0 (System.Object state) [0x00000] in <3fd174ff54b146228c505f23cf75ce71>:0
 at Android.App.SyncContext+<>c__DisplayClass2_0.<Post>b__0 () [0x00000] in <d855bac285f44dda8a0d8510b679b1e2>:0
 at Java.Lang.Thread+RunnableImplementor.Run () [0x00008] in <d855bac285f44dda8a0d8510b679b1e2>:0
 at Java.Lang.IRunnableInvoker.n_Run (System.IntPtr jnienv, System.IntPtr native__this) [0x00008] in <d855bac285f44dda8a0d8510b679b1e2>:0
 at at (wrapper dynamic-method) System.Object:a4fed05a-cd7a-4756-85bb-5dd975374042 (intptr,intptr)

Answer 1

As the GetContainer method defined under AzureStorage.cs as follows:

static CloudBlobContainer GetContainer(ContainerType containerType)
{
     var account = CloudStorageAccount.Parse(Constants.StorageConnection);
     var client = account.CreateCloudBlobClient();
     return client.GetContainerReference(containerType.ToString().ToLower());
}

It seems that the error was thrown by CloudStorageAccount.Parse , but from BergQuester's link about CloudStorageAccount.Parse , we could find that this error is not from the predictable exceptions.

From your stack trace, we could find the error was thrown at Setting(string name, params string[] validValues) from CloudStorageAccount.cs . I used WindowsAzure.Storage 8.3.0 and tested it under my BruceChen_Mobile.UWP project and PCL project, it could work as expected with my azure storage connection string.

I applied my connection string in the sample project and it worked, but not in my own project.

I would recommend you checking the packages between your application and the xamarin-forms-samples . Or you could provide a reproducible sample project for us to narrow this issue.

Answer 2

我通过从我的本机项目（不仅仅是在PCL项目中）添加对WindowsAzure.Storage nuget包的引用来修复此问题，因为它需要在这些引用中定义的一些本机实现。