Generate a WCF client proxy for a netstandard Xamarin.Forms project RRS feed

  • Question

  • User353689 posted

    I've created a Xamarin.Forms project with a netstandard2.0 targeting library instead of a shared or PCL library. So far this compiles and works. I'm using an up2date version of Visual Studio 2017 Community.

    I also have created a WCF service that gonna be hosted on windows itself (not IIS). I've configured my app.config to provide a Metadata Exchange Endpoint:

    <?xml version="1.0"?>
            <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
                <service behaviorConfiguration="MM.Server.ServiceServerBehavior" name="MM.Server.ServiceServer">
                    <endpoint address="net.tcp://localhost:8730/MMServer/" binding="netTcpBinding" bindingConfiguration="NetTcpBinding_IServiceServer" bindingName="NetTcpBinding_IServiceServer_EndPoint" contract="MM.Contracts.IServiceServer">
                            <dns value="localhost"/>
                    <endpoint address="hxxp://localhost:8731/MMServer/mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
                            <add baseAddress="net.tcp://localhost:8730/MMServer/"/>
                    <behavior name="MM.Server.ServiceServerBehavior">
                        <serviceMetadata httpGetEnabled="true" httpGetUrl="hxxp://localhost:8731/MMServer/mex" />
                        <serviceDebug includeExceptionDetailInFaults="true"/>
                    <binding name="NetTcpBinding_IServiceServer" closeTimeout="00:01:00" openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00" transactionFlow="false" transferMode="Buffered" transactionProtocol="OleTransactions" hostNameComparisonMode="StrongWildcard" listenBacklog="10" maxBufferPoolSize="2147483647" maxBufferSize="2147483647" maxConnections="10" maxReceivedMessageSize="2147483647">
                        <readerQuotas maxDepth="32" maxStringContentLength="2147483647" maxArrayLength="2147483647" maxBytesPerRead="2147483647" maxNameTableCharCount="16384"/>
                        <reliableSession ordered="true" inactivityTimeout="01:00:00" enabled="false"/>
                        <security mode="None"><!-- TODO: Add more security later -->
                            <transport clientCredentialType="None" protectionLevel="None"/>

    This is a very simple configuration and I don't care about security for now. The service runs, successfully.

    Now I cannot simply add a service reference to my Xamarin.Forms project, since netstandard does not provide System.ServiceModel.

    I've found out that I can use the SLsvcUtil.exe from the Silverlight SDK to generate the client proxy for my WCF service that is compatible to Xamarin.Forms targeting netstandard instead, however I cannot get it running.

    No matter how I try to use the SLsvcUtil.exe while my WCF service is running, I always get the error:

    Error: An error occurred in the tool.
    Error: Object reference not set to an instance of an object.

    Here is my batch that I used to execute SLsvcUtil.exe:

    set "namespace=*,MM.Services"
    set "mexPath=hxxp://localhost:8731/MM/mex"
    set "svcutil=C:\Program Files (x86)\Microsoft SDKs\Silverlight\v5.0\Tools\SLsvcUtil.exe"
    set "outputDir=C:\vsproj\Xamarin\MM\MM.App"
    "%svcutil%" %mexPath% /directory:"%outputDir%" /namespace:"%namespace%"

    The localhost mex address returns the full WSDL, successfully.

    How can I get a working generated client proxy for my Xamarin.Forms app that is targeting netstandard2.0? I'm open for any alternative that leads to the same desired result.

    Monday, November 13, 2017 9:32 PM

All replies

  • User369520 posted

    Did you ever manage to resolve this?

    Wednesday, June 27, 2018 10:55 PM