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ASMX web service client .NET 6 (Android) Deserialization error with net6.0-android31.0 TFM
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(227.2, 1%, 32%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EA%3C/text%3E%3C/svg%3E)
Adolfo
6
Reputation points
I'm running into a Web Service deserialization issue in a Xamarin .NET 6 Android project.
My Visual Studio Version is: Version 17.3.0 Preview 5.0
Here is my csproj file:
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>net6.0-android31.0</TargetFramework>
<OutputType>Exe</OutputType>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="System.ServiceModel.Duplex" Version="4.9.0" />
<PackageReference Include="System.ServiceModel.Federation" Version="4.9.0" />
<PackageReference Include="System.ServiceModel.Http" Version="4.9.0" />
<PackageReference Include="System.ServiceModel.NetTcp" Version="4.9.0" />
<PackageReference Include="System.ServiceModel.Security" Version="4.9.0" />
<PackageReference Include="Xamarin.AndroidX.AppCompat" Version="1.3.0" />
<PackageReference Include="Xamarin.Google.Android.Material" Version="1.3.0.1" />
</ItemGroup>
</Project>
I added a Connected Service pointing to an ASMX file and I get this exception when calling one of my Web Service methods:
The formatter threw an exception while trying to deserialize the message: There was an error while trying to deserialize parameter http://tempuri.org/:GetLastLoginResponse. The InnerException message was 'There was an error deserializing the object of type ServiceReference1.GetLastLoginResponseBody. Unexpected end of file. Following elements are not closed: GetLastLoginResponse, Body, Envelope. Line 1, position 334.'. Please see InnerException for more details.
Inner exception: Unexpected end of file. Following elements are not closed: GetLastLoginResponse, Body, Envelope. Line 1, position 334.
The strange thing is that when I change the TFM to:
<TargetFramework>net6.0-android</TargetFramework>
Then I don't get the deserialization exception
Here is the Full Stack Trace:
at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.DeserializeParameterPart(XmlDictionaryReader reader, PartInfo part, Boolean isRequest) in /_/src/System.Private.ServiceModel/src/System/ServiceModel/Dispatcher/DataContractSerializerOperationFormatter.cs:line 543
at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.DeserializeParameter(XmlDictionaryReader reader, PartInfo part, Boolean isRequest) in /_/src/System.Private.ServiceModel/src/System/ServiceModel/Dispatcher/DataContractSerializerOperationFormatter.cs:line 513
at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.DeserializeParameters(XmlDictionaryReader reader, PartInfo[] parts, Object[] parameters, Boolean isRequest) in /_/src/System.Private.ServiceModel/src/System/ServiceModel/Dispatcher/DataContractSerializerOperationFormatter.cs:line 484
at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.DeserializeBody(XmlDictionaryReader reader, MessageVersion version, String action, MessageDescription messageDescription, Object[] parameters, Boolean isRequest) in /_/src/System.Private.ServiceModel/src/System/ServiceModel/Dispatcher/DataContractSerializerOperationFormatter.cs:line 465
at System.ServiceModel.Dispatcher.OperationFormatter.DeserializeBodyContents(Message message, Object[] parameters, Boolean isRequest) in /_/src/System.Private.ServiceModel/src/System/ServiceModel/Dispatcher/OperationFormatter.cs:line 259
at System.ServiceModel.Dispatcher.OperationFormatter.DeserializeReply(Message message, Object[] parameters) in /_/src/System.Private.ServiceModel/src/System/ServiceModel/Dispatcher/OperationFormatter.cs:line 133
at System.ServiceModel.Dispatcher.ProxyOperationRuntime.AfterReply(ProxyRpc& rpc) in /_/src/System.Private.ServiceModel/src/System/ServiceModel/Dispatcher/ProxyOperationRuntime.cs:line 137
at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc& rpc) in /_/src/System.Private.ServiceModel/src/System/ServiceModel/Channels/ServiceChannel.cs:line 956
at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout) in /_/src/System.Private.ServiceModel/src/System/ServiceModel/Channels/ServiceChannel.cs:line 775
at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs) in /_/src/System.Private.ServiceModel/src/System/ServiceModel/Channels/ServiceChannel.cs:line 715
at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(MethodCall methodCall, ProxyOperationRuntime operation) in /_/src/System.Private.ServiceModel/src/System/ServiceModel/Channels/ServiceChannelProxy.cs:line 372
at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(MethodInfo targetMethod, Object[] args) in /_/src/System.Private.ServiceModel/src/System/ServiceModel/Channels/ServiceChannelProxy.cs:line 144
at generatedProxy_1.GetLastLogin(GetLastLoginRequest )
at ServiceReference1.TimeCardServiceSoapClient.ServiceReference1.TimeCardServiceSoap.GetLastLogin(GetLastLoginRequest request) in C:\Development\GitRepos\Prototypes\net6-mobile-samples-main\HelloAndroid\Connected Services\ServiceReference1\Reference.cs:line 12866
at ServiceReference1.TimeCardServiceSoapClient.GetLastLogin(String username, String password, String userType, String& message) in C:\Development\GitRepos\Prototypes\net6-mobile-samples-main\HelloAndroid\Connected Services\ServiceReference1\Reference.cs:line 12876
at HelloAndroid.MainActivity.OnCreate(Bundle savedInstanceState) in C:\Development\GitRepos\Prototypes\net6-mobile-samples-main\HelloAndroid\MainActivity.cs:line
Any ideas on why deserialization behaves different with the net6.0-android31.0 TFM?
{count} vote
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Leon Lu (Shanghai Wicresoft Co,.Ltd.) 74,641 Reputation points Microsoft Vendor2022-08-01T09:39:40.21+00:00 Do you create a Xamarin project or MAUI project? Xamarin project 's target framework is .NET Standard. MAUI project's .Net workload.
What is the expected behavior and how does that differ from the actual behavior? -
Adolfo 6 Reputation points
2022-08-02T10:36:58.673+00:00 I created a Xamarin Android native app not MAUI. Based on Microsoft official documentation upgrade path for Xamarin Native is .Net6 (my case) while upgrade path for Xamarin Forms is MAUI. My repro project was based on @James Montemagno Hello Android project from here https://github.com/jamesmontemagno/net6-mobile-samples which uses .net6.0-android as TargetFrameworkMoniker, not .Net Standard. I have also posted this question in Tech Community https://techcommunity.microsoft.com/t5/app-development/asmx-web-service-client-net-6-android-deserialization-error-with/m-p/3586904 but they told me to post here.
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Leon Lu (Shanghai Wicresoft Co,.Ltd.) 74,641 Reputation points Microsoft Vendor
2022-08-03T03:11:49.027+00:00 Now you have migrated Xamarin project to the MAUI project, when you set multi-targeting frameworks in Maui, but it does not work, if you set multi-targeting frameworks to
net6.0-android, it is working, am I right?If so, this issue was reported on GitHub, please check and wait for PG‘s update.
Multi-targeting frameworks in Maui does not work
A multitargeting project that references 2 projects with the same name under 2 different TFMs fails to compile -
Adolfo 6 Reputation points
2022-08-03T16:47:15.387+00:00 Hi @Leon Lu (Shanghai Wicresoft Co,.Ltd.) ,
Again, I'm working on a Xamarin Traditional Android (NOT MAUI), upgrading it to .NET 6. Moving to MAUI is not an option for me, that only applies to Xamarin Forms apps.
I'm trying to do something similar to this:
https://learn.microsoft.com/en-us/answers/questions/743794/migrate-traditional-xamarinandroid-app-to-support.html
Here the official MSFT documentation on how to move from Xamarin Traditional to .NET 6:
https://devblogs.microsoft.com/xamarin/the-new-net-multi-platform-app-ui-maui/#net-6-and-mobile-sdksThe problem I have is that my Xamarin Traditional -> Web Services (ASMX) integration from my existing application breaks when we upgrade to .NET 6 throwing deserialization problems. I was able to reproduce by setting the Target Framework Moniker to .net6-android31.0. We need to know why deserialization fails using that TFM.
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Adolfo 6 Reputation points
2022-08-03T19:57:28.803+00:00 I have uploaded a full Solution which reproduces the problem to my github: https://github.com/adolfo1981/Net6AndroidWebServiceTest
It contains a Xamarin Android (.NET 6) project, a Web service Server (.NET 4.8) and a Web Service Client (.NET 6) used by my Android project to consume the ASMX Web Services. The deserialization issue happens even with the simple "Hello World" method in my Web Service.
Who can help me with this? -
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Yuvraj Singh 1 Reputation point2022-12-08T04:16:10.153+00:00 Hi @Leon Lu (Shanghai Wicresoft Co,.Ltd.) ,
Have there been any updates to this issue?
We are facing the same issue and are unable to proceed to using .NET 6 for our Xamarin solution.Adolfo has provided a solution to repro above: https://github.com/adolfo1981/Net6AndroidWebServiceTest
Is there any documentation saying that WCF is no longer supported in .NET 6, or is this a bug that needs to get resolved?
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Stephen Burns 5 Reputation points2023-01-18T21:26:21.8866667+00:00 Hi @Leon Lu (Shanghai Wicresoft Co,.Ltd.) I am curious if this has been given any attention as I'm encountering the same exception. In my case, I've got a MAUI app trying to connect to an ASMX web service. The app connects without issue on the iOS and Windows platforms, but this issue is preventing me from moving forward on Android.
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