wcf: System.PlatformNotSupportedException: Compiling JScript/CSharp scripts is not supported

I understood the root cause of the issue. One of the types generated by WCF Connected Service was wrong, see below.

        /// <remarks/>
        [System.Xml.Serialization.XmlArrayAttribute(Order=5)]
        [System.Xml.Serialization.XmlArrayItemAttribute("columns", typeof(ListViewRecordColumn), IsNullable=false)]
        public ListViewRecordColumn[][] records
        {
            get
            {
                return this.recordsField;
            }
            set
            {
                this.recordsField = value;
            }
        }

The property is a 2-dimensional array, but the XmlArrayItemAttribute speicifed the item type as typeof(ListViewRecordColumn). To work around the issue, we can change the item type to typeof(ListViewRecordColumn[]).

The issue is a duplicate of https://github.com/dotnet/wcf/issues/1274. Resolved the issue as duplicate.

Hi Son, I tried the repro and could repro the issue on my machine. For now it seems to be a bug with the XmlSerializer generation using RefEmit. I need to investigate the issue further to understand the root cause.

XmlSerializer has a special mode in which the serializer would use reflection instead of RefEmit to do serialization. I wondered if the app would work in that mode. If you are willing to give it a try, you can enable the mode by using the code below at the app’s startup,

static void Main(string[] args)
{
    MethodInfo method = typeof(XmlSerializer).GetMethod("set_Mode", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static);
    method.Invoke(null, new object[] { 1 });

    // Your code goes here
}

Note that, using reflection to enable the mode is subject to future changes.

@StephenMolloy, @HongGit, I think it might be worth revisiting this. This was closed in preference of another issue, and that issue was closed as there was a workaround. From what I remember/can tell, the problem is there are certain .NET class definitions which when generating an XmlSerializer using Ref.Emit would result in an exception being thrown and it would fail to generate. On .NET Framework, this triggered a fallback code path where it would use the legacy code generation XmlSerializer implementation which would work. One example where I’ve seen this happen is that when using code generation, the compiler can take advantage of implicit type conversion and implicit type conversion operators which Ref.Emit can’t (although that’s not solved by the reflection based serializer either, it would be a lot easier to implement there). I think we should consider an option to fall back to the reflection based serializer implementation in Core, but opt-in only as @Catchops mentioned, there can be cases where it does the wrong thing so this should be explicit.

@HongGit, I think there’s scope here for looking at what dotnet-svcutil produces from the WSDL as it seems like it might be interpreting it incorrectly. If modifying the generated classes makes something work, then we might have a bug that we can fix.

@Catchops, can you/did you open an issue about the reflection based serializer doing the wrong thing?

It is unfortunate that this issue is marked as closed (as well as https://github.com/dotnet/wcf/issues/1274 and https://github.com/dotnet/wcf/issues/2743 and https://github.com/dotnet/wcf/issues/2219 referred to as duplicate), as I encountered this problem today; but a Big Thank You to @shmao for the workaround, (above).

In my case, this Service Reference code that was generated from Vendor WSDL:

public System.Threading.Tasks.Task<bool> pingAsync(ServiceReferenceCompany.VendorLogin VendorLogin)
{
    return base.Channel.pingAsync(VendorLogin);
}

being called like this:

VendorSoapV1Client a = new VendorSoapV1Client(VendorSoapV1Client.EndpointConfiguration.VendorSoapV1SOAP, "https://vendor.contoso.com/Vendor/SoapV1/Service");
            
VendorLogin myLogin = new VendorLogin();
myLogin.Login = "username";
myLogin.Password = "password";

bool ok = await a.pingAsync(myLogin);

resulted in the Compiling JScript/CSharp scripts is not supported error on that bool ok line.

As described above, adding these lines using System.Reflection appears to have fixed the error for me:

MethodInfo method = typeof(XmlSerializer).GetMethod("set_Mode", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static);
method.Invoke(null, new object[] { 1 });

*Edit: using Visual Studio 2019 Version 16.1.6 .NET Core 2.2 Console Application

I have a similar issue with .NET 7 and official Microsoft’s schemas for Dynamics - https://learn.microsoft.com/en-us/dynamics365/customerengagement/on-premises/developer/customize-dev/form-xml-schema?view=op-9-1 I downloaded the schemas from here: https://download.microsoft.com/download/B/9/7/B97655A4-4E46-4E51-BA0A-C669106D563F/Schemas.zip Then I generated CS using XSD tool and when trying to create a XMLSerializer: var serializer = new XmlSerializer(typeof(FormType)); I get this error:

Compiling JScript/CSharp scripts is not supported

Stack trace:

at System.Xml.Serialization.TempAssembly…ctor(XmlMapping[] xmlMappings, Type[] types, String defaultNamespace, String location) in //src/libraries/System.Private.Xml/src/System/Xml/Serialization/Compilation.cs:line 86 at System.Xml.Serialization.XmlSerializer.GenerateTempAssembly(XmlMapping xmlMapping, Type type, String defaultNamespace, String location) in //src/libraries/System.Private.Xml/src/System/Xml/Serialization/XmlSerializer.cs:line 316 at System.Xml.Serialization.XmlSerializer…ctor(Type type, String defaultNamespace) in //src/libraries/System.Private.Xml/src/System/Xml/Serialization/XmlSerializer.cs:line 249 at Dyn365.Mapping.Profiles.FormContextProfile.GetFormXml(Form form) in E:\Tests\Dyn365\Mapping\Profiles\FormContextProfile.cs:line 23 at Microsoft.EntityFrameworkCore.Query.Internal.SplitQueryingEnumerable`1.AsyncEnumerator.<MoveNextAsync>d__21.MoveNext() in //src/EFCore.Relational/Query/Internal/SplitQueryingEnumerable.cs:line 340

I think that the problem is probably this:

[System.CodeDom.Compiler.GeneratedCodeAttribute("xsd", "4.8.3928.0")]
[System.SerializableAttribute()]
[System.Diagnostics.DebuggerStepThroughAttribute()]
[System.ComponentModel.DesignerCategoryAttribute("code")]
public partial class OrDisplayRuleType {

    private object[][] orField;

    /// <remarks/>
    [System.Xml.Serialization.XmlArrayAttribute(Form = System.Xml.Schema.XmlSchemaForm.Unqualified)]
    [System.Xml.Serialization.XmlArrayItemAttribute("CommandClientTypeRule", typeof(CommandClientTypeRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("CrmClientTypeRule", typeof(CrmClientTypeRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("CrmOfflineAccessStateRule", typeof(CrmOfflineAccessStateRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("CrmOutlookClientTypeRule", typeof(CrmOutlookClientTypeRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("CrmOutlookClientVersionRule", typeof(CrmOutlookClientVersionRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("DeviceTypeRule", typeof(DeviceTypeRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("EntityPrivilegeRule", typeof(EntityPrivilegeRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("EntityPropertyRule", typeof(EntityPropertyRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("EntityRule", typeof(EntityRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("FeatureControlRule", typeof(FeatureControlRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("FormEntityContextRule", typeof(FormEntityContextRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("FormStateRule", typeof(FormStateRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("FormTypeRule", typeof(FormTypeRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("HideForTabletExperienceRule", typeof(HideForTabletExperienceRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("HideIfCurrentUserIsNotSystemAdministratorRule", typeof(HideIfCurrentUserIsNotSystemAdministratorRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("HideIfDelveNotAvailableRule", typeof(HideIfDelveNotAvailableRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("HideIfDisabledForMobileRule", typeof(HideIfDisabledForMobileRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("HideIfEmailIsApprovedByAdminBasedOnESPRule", typeof(HideIfEmailIsApprovedByAdminBasedOnESPRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("HideIfEmailIsApprovedByAdminRule", typeof(HideIfEmailIsApprovedByAdminType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("HideIfEmailSignatureNotEnabledRule", typeof(HideIfEmailSignatureNotEnabledRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("HideIfExportToExcelNotEnabledRule", typeof(HideIfExportToExcelNotEnabledRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("HideIfHybridSSSNotEnabledRule", typeof(HideIfHybridSSSNotEnabledRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("HideIfNetBreezeNotAvailableRule", typeof(HideIfNetBreezeNotAvailableRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("HideIfO365UserDoesNotHaveExchangeSubscriptionsRule", typeof(HideIfO365UserDoesNotHaveExchangeSubscriptionsRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("HideIfPowerBITileNotAvailableRule", typeof(HideIfPowerBITileNotAvailableRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("HideIfProcessActiveRule", typeof(HideIfProcessActiveRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("HideIfProcessInactiveRule", typeof(HideIfProcessInactiveRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("HideIfProcessUnificationIsDisabledRule", typeof(HideIfProcessUnificationIsDisabledRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("HideIfProductRecommendationsNotEnabledRule", typeof(HideIfProductRecommendationsNotEnabledType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("HideIfReverseHybridSSSNotEnabledRule", typeof(HideIfReverseHybridSSSNotEnabledRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("HideIfSSSTroubleshootingNotEnabledRule", typeof(HideIfSSSTroubleshootingNotEnabledRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("HideIfServiceMetadataAvailableRule", typeof(HideIfServiceMetadataAvailableRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("HideIfSharepointS2SConfigurationEnabledRule", typeof(HideIfSharepointS2SConfigurationEnabledRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("HideIfTestExchangeServerNotEnabledRule", typeof(HideIfTestExchangeServerNotEnabledRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("HideIfUserIsNotTenantAdminRule", typeof(HideIfUserIsNotTenantAdminType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("IsExportToExcelOnlineEnabledRule", typeof(IsExportToExcelOnlineEnabledRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("MiscellaneousPrivilegeRule", typeof(MiscellaneousPrivilegeRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("OptionSetRule", typeof(OptionSetRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("OrganizationSettingRule", typeof(OrganizationSettingRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("OutlookRenderTypeRule", typeof(OutlookRenderTypeRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("OutlookVersionRule", typeof(OutlookVersionRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("PageRule", typeof(PageRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("ReferencingAttributeRequiredRule", typeof(ReferencingAttributeRequiredRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("RelationshipTypeRule", typeof(RelationshipTypeRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("SkuRule", typeof(SkuRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    [System.Xml.Serialization.XmlArrayItemAttribute("ValueRule", typeof(ValueRuleType), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    public object[][] Or
    {
        get
        {
            return this.orField;
        }
        set
        {
            this.orField = value;
        }
    }
}

but I’m not sure if I can replace [][] with a single [].

Besides that are there any plans to fix this buggy behavior?

@HongGit I’m not sure I understand. Which other item is currently tracking this issue? I am currently having to manually modify the generated classes post-hoc. So I would really like to know which item to follow for an eventual solution to this issue.

Hi Son, I tried the repro and could repro the issue on my machine. For now it seems to be a bug with the XmlSerializer generation using RefEmit. I need to investigate the issue further to understand the root cause.

XmlSerializer has a special mode in which the serializer would use reflection instead of RefEmit to do serialization. I wondered if the app would work in that mode. If you are willing to give it a try, you can enable the mode by using the code below at the app’s startup,

static void Main(string[] args)
{
    MethodInfo method = typeof(XmlSerializer).GetMethod("set_Mode", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static);
    method.Invoke(null, new object[] { 1 });

    // Your code goes here
}

Note that, using reflection to enable the mode is subject to future changes.

For anyone who is reading this - the Reflection code does indeed work as a workaround. However, be very careful. I put this into our code which fixed the issue with the .cs files being generated from the svcutil utility. However, we had other code in our application where the Reflection changes caused harm to the XML serialization being done there. In our case, code to make payments. Therefore, make sure you do a thorough regression test on the application you are working in.

The property is a 2-dimensional array, but the XmlArrayItemAttribute speicifed the item type as typeof(ListViewRecordColumn). To work around the issue, we can change the item type to typeof(ListViewRecordColumn[]).

The issue is a duplicate of #1274. Resolved the issue as duplicate.

I searched the XSD file I had for Type[][] and fixed the corresponding XmlArrayItemAttribute from typeof(Type) to typeof(Type[]) and also got it working! Thanks so much @shmao