C# AWS Cognito注册

我正试图遵循使用C#from在Cognito中注册用户的示例。我不得不添加一些东西，因为

AmazonCongnitoIdentityProviderClient

没有空构造函数。我的应用程序恰好是Xamarin表单应用程序，但这不重要。我试着在一个.NETStandard项目中这样做，但是不断地得到一个错误，说这个方法不存在。所以我切换到PCL，现在我得到

System.IO.InvalidDataException:无法确定协议

。我在Android和iOS上都遇到了这个错误

这是我的密码：

public async Task SignupUser(string username, string password, string email)
{
    const string UserPoolId = "us-east-1_XXXXXXXXX";
    const string ClientId = "6xxxxxxxxxxxxxxxxxxxxxxxxx";
    const string ClientSecret = "my-client-secret";
    const string CognitoIdentityPoolId = "us-east-1:identity-pool-id-here";

    try
    {
        AmazonCognitoIdentityProviderConfig providerConfig = new AmazonCognitoIdentityProviderConfig()
        {
            RegionEndpoint = RegionEndpoint.USEast1
        };

        CognitoAWSCredentials cogCreds = new CognitoAWSCredentials(CognitoIdentityPoolId, RegionEndpoint.USEast1);

        IdentityProvider = new AmazonCognitoIdentityProviderClient(cogCreds, RegionEndpoint.USEast1);
        SignUpRequest signUpRequest = new SignUpRequest()
        {
            ClientId = ClientId,
            Password = password,
            Username = username
        };
        AttributeType emailAttribute = new AttributeType()
        {
            Name = "email",
            Value = email
        };
        signUpRequest.UserAttributes.Add(emailAttribute);

        var signUpResult = await IdentityProvider.SignUpAsync(signUpRequest);
    }
    catch (Exception ex)
    {
        Debug.WriteLine(ex);
    }
}

例外情况如下：

System.IO.InvalidDataException: Cannot determine protocol
  at Amazon.Runtime.Internal.Signer.SignRequest (Amazon.Runtime.IRequestContext requestContext) [0x0007a] in <e08989525980425e9b2f389f7417830e>:0 
  at Amazon.Runtime.Internal.Signer.PreInvoke (Amazon.Runtime.IExecutionContext executionContext) [0x00013] in <e08989525980425e9b2f389f7417830e>:0 
  at Amazon.Runtime.Internal.Signer.InvokeAsync[T] (Amazon.Runtime.IExecutionContext executionContext) [0x00000] in <e08989525980425e9b2f389f7417830e>:0 
  at Amazon.Runtime.Internal.PipelineHandler.InvokeAsync[T] (Amazon.Runtime.IExecutionContext executionContext) [0x0000e] in <e08989525980425e9b2f389f7417830e>:0 
  at Amazon.Runtime.Internal.CredentialsRetriever.<>n__0[T] (Amazon.Runtime.IExecutionContext executionContext) [0x00000] in <e08989525980425e9b2f389f7417830e>:0 
  at Amazon.Runtime.Internal.CredentialsRetriever+<InvokeAsync>d__7`1[T].MoveNext () [0x00103] in <e08989525980425e9b2f389f7417830e>:0 
--- End of stack trace from previous location where exception was thrown ---
  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:152 
  at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 
  at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 
  at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 
  at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter[TResult].GetResult () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:535 
  at Amazon.Runtime.Internal.RetryHandler+<InvokeAsync>d__10`1[T].MoveNext () [0x000b0] in <e08989525980425e9b2f389f7417830e>:0 
--- End of stack trace from previous location where exception was thrown ---
  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:152 
  at Amazon.Runtime.Internal.RetryHandler+<InvokeAsync>d__10`1[T].MoveNext () [0x001b0] in <e08989525980425e9b2f389f7417830e>:0 
--- End of stack trace from previous location where exception was thrown ---
  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:152 
  at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 
  at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 
  at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 
  at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter[TResult].GetResult () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:535 
  at Amazon.Runtime.Internal.CallbackHandler+<InvokeAsync>d__9`1[T].MoveNext () [0x00080] in <e08989525980425e9b2f389f7417830e>:0 
--- End of stack trace from previous location where exception was thrown ---
  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:152 
  at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 
  at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 
  at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 
  at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter[TResult].GetResult () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:535 
  at Amazon.Runtime.Internal.CallbackHandler+<InvokeAsync>d__9`1[T].MoveNext () [0x00080] in <e08989525980425e9b2f389f7417830e>:0 
--- End of stack trace from previous location where exception was thrown ---
  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:152 
  at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 
  at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 
  at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 
  at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter[TResult].GetResult () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:535 
  at Amazon.Runtime.Internal.ErrorCallbackHandler+<InvokeAsync>d__5`1[T].MoveNext () [0x00099] in <e08989525980425e9b2f389f7417830e>:0 
--- End of stack trace from previous location where exception was thrown ---
  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:152 
  at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 
  at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 
  at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 
  at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter[TResult].GetResult () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:535 
  at Amazon.Runtime.Internal.MetricsHandler+<InvokeAsync>d__1`1[T].MoveNext () [0x000ab] in <e08989525980425e9b2f389f7417830e>:0 
--- End of stack trace from previous location where exception was thrown ---
  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:152 
  at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 
  at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 
  at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 
  at System.Runtime.CompilerServices.TaskAwaiter`1[TResult].GetResult () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:357 

System.IO.InvalidDataException:无法确定协议
在：0中的Amazon.Runtime.Internal.Signer.SignRequest（Amazon.Runtime.IRequestContext requestContext）[0x0007a]处
在：0中的Amazon.Runtime.Internal.Signer.PreInvoke（Amazon.Runtime.IExecutionContext executionContext）[0x00013]处
在：0中的Amazon.Runtime.Internal.Signer.InvokeAsync[T]（Amazon.Runtime.IExecutionContext executionContext）[0x00000]处
在：0中的Amazon.Runtime.Internal.PipelineHandler.InvokeAsync[T]（Amazon.Runtime.IExecutionContext executionContext）[0x0000e]处
在Amazon.Runtime.Internal.CredentialsRetriever.n_u0[T]（Amazon.Runtime.IExecutionContext executionContext）[0x00000]中：0
在Amazon.Runtime.Internal.CredentialsRetriever+d_u7`1[T].MoveNext（）[0x00103]中：0
---来自引发异常的上一个位置的堆栈结束跟踪---
在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/System/Runtime/ExceptionServices/ExceptionServices/exceptionservicescommon.cs:152中的System.Runtime.ExceptionDispatchInfo.thInfo（）[0x0000c]
在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/System/Runtime/CompilerServices/TaskAwaiter.cs:187中的System.Runtime.CompilerServices.taskwaiter.ThrowForNonSuccess（System.Threading.Tasks.Task任务）[0x00037]
在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/System/Runtime/CompilerServices/TaskAwaiter.cs:156中的System.Runtime.CompilerServices.taskwaiter.HandleNonSuccessAndDebuggerNotification（System.Threading.Tasks.Task任务）[0x00028]处
在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/System/Runtime/CompilerServices/TaskAwaiter.cs:128中的System.Runtime.CompilerServices.taskwaiter.ValidateEnd（System.Threading.Tasks.Task任务）[0x00008]
在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/System/Runtime/CompilerServices/TaskAwaiter.cs:535中的System.Runtime.CompilerServices.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter[TResult].GetResult（）[0x00000]
在Amazon.Runtime.Internal.RetryHandler+d_u10`1[T].MoveNext（）[0x000b0]中：0
---来自引发异常的上一个位置的堆栈结束跟踪---
在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/System/Runtime/ExceptionServices/ExceptionServices/exceptionservicescommon.cs:152中的System.Runtime.ExceptionDispatchInfo.thInfo（）[0x0000c]
在Amazon.Runtime.Internal.RetryHandler+d_u10`1[T].MoveNext（）[0x001b0]中：0
---来自引发异常的上一个位置的堆栈结束跟踪---
在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/System/Runtime/ExceptionServices/ExceptionServices/exceptionservicescommon.cs:152中的System.Runtime.ExceptionDispatchInfo.thInfo（）[0x0000c]
在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/System/Runtime/CompilerServices/TaskAwaiter.cs:187中的System.Runtime.CompilerServices.taskwaiter.ThrowForNonSuccess（System.Threading.Tasks.Task任务）[0x00037]
在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/System/Runtime/CompilerServices/TaskAwaiter.cs:156中的System.Runtime.CompilerServices.taskwaiter.HandleNonSuccessAndDebuggerNotification（System.Threading.Tasks.Task任务）[0x00028]处
在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/System/Runtime/CompilerServices/TaskAwaiter.cs:128中的System.Runtime.CompilerServices.taskwaiter.ValidateEnd（System.Threading.Tasks.Task任务）[0x00008]
在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/System/Runtime/CompilerServices/TaskAwaiter.cs:535中的System.Runtime.CompilerServices.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter[TResult].GetResult（）[0x00000]
在Amazon.Runtime.Internal.CallbackHandler+d_u9`1[T].MoveNext（）[0x00080]中：0
---来自引发异常的上一个位置的堆栈结束跟踪---
在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/System/Runtime/ExceptionServices/ExceptionServices/exceptionservicescommon.cs:152中的System.Runtime.ExceptionDispatchInfo.thInfo（）[0x0000c]
在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/System/Runtime/CompilerServices/TaskAwaiter.cs:187中的System.Runtime.CompilerServices.taskwaiter.ThrowForNonSuccess（System.Threading.Tasks.Task任务）[0x00037]
在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/System/Runtime/CompilerServices/TaskAwaiter.cs:156中的System.Runtime.CompilerServices.taskwaiter.HandleNonSuccessAndDebuggerNotification（System.Threading.Tasks.Task任务）[0x00028]处
在/Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/System/Runtime/CompilerServices/TaskAwaiter.cs:128中的System.Runtime.CompilerServices.taskwaiter.ValidateEnd（System.Threading.Tasks.Task任务）[0x00008]
在System.Runtime.Compilers上
IdentityProvider = new AmazonCognitoIdentityProviderClient(null, RegionEndpoint.USEast1);

var region = RegionEndpoint.GetBySystemName("us-west-2"); // use the region that you need
IdentityProvider = new AmazonCognitoIdentityProviderClient(null, region);