DataContract containing IList<struct> produces invalid WSDL

If you have a DataContract containing a property of type IList<T> where T is a struct, the WSDL that is generated is invalid.

Example

    [ServiceContract]
    public interface IMyService
    {
        [OperationContract]
        void Do(DTO input);
    }

    public class MyService : IMyService
    {
        public void Do(DTO input)
        {
        }
    }

    [DataContract]
    public class DTO
    {
        [DataMember]
        public IList<AnyStruct> MyStructs { get; set; }
    }

    [DataContract]
    public struct AnyStruct
    {
    }

The code above will yield the following WSDL.

Please note the name attribute has no value.

<xs:complexType xmlns:ser="http://schemas.microsoft.com/2003/10/Serialization/" name="ArrayOfAnyStruct">
   <xs:sequence>
      <xs:element minOccurs="0" maxOccurs="unbounded" name="" type="xs:"/>
   </xs:sequence>
</xs:complexType>

Adding a [FaultContract(typeof(InvalidOperationException))] attribute will also cause this behavior.

The WSDL cannot be imported into the WCF Test Client or Visual Studio 2019. Given that in the actual problem case, I do not own the type, is there any way around this?

Thanks in advance, -Bart

Full WSDL

<?xml version="1.0" encoding="UTF-8"?>
<wsdl:definitions xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:http="http://schemas.microsoft.com/ws/06/2004/policy/http" xmlns:msc="http://schemas.microsoft.com/ws/2005/12/wsdl/contract" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:tns="http://tempuri.org/" xmlns:wsam="http://www.w3.org/2007/05/addressing/metadata" xmlns:wsp="http://schemas.xmlsoap.org/ws/2004/09/policy" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" xmlns:xsd="http://www.w3.org/2001/XMLSchema" targetNamespace="http://tempuri.org/" name="MyService">
   <wsdl:types>
      <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:ser="http://schemas.microsoft.com/2003/10/Serialization/" elementFormDefault="qualified" targetNamespace="http://tempuri.org/">
         <xs:import namespace="http://schemas.datacontract.org/2004/07/WebApplication1.Service" />
         <xs:element name="Do">
            <xs:complexType>
               <xs:sequence>
                  <xs:element xmlns:q1="http://schemas.datacontract.org/2004/07/WebApplication1.Service" minOccurs="0" name="input" nillable="true" type="q1:DTO" />
               </xs:sequence>
            </xs:complexType>
         </xs:element>
         <xs:element name="DoResponse">
            <xs:complexType>
               <xs:sequence />
            </xs:complexType>
         </xs:element>
      </xs:schema>
      <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:tns="http://schemas.microsoft.com/2003/10/Serialization/" attributeFormDefault="qualified" elementFormDefault="qualified" targetNamespace="http://schemas.microsoft.com/2003/10/Serialization/">
         <xs:element name="anyType" nillable="true" type="xs:anyType" />
         <xs:element name="anyURI" nillable="true" type="xs:anyURI" />
         <xs:element name="base64Binary" nillable="true" type="xs:base64Binary" />
         <xs:element name="boolean" nillable="true" type="xs:boolean" />
         <xs:element name="byte" nillable="true" type="xs:byte" />
         <xs:element name="dateTime" nillable="true" type="xs:dateTime" />
         <xs:element name="decimal" nillable="true" type="xs:decimal" />
         <xs:element name="double" nillable="true" type="xs:double" />
         <xs:element name="float" nillable="true" type="xs:float" />
         <xs:element name="int" nillable="true" type="xs:int" />
         <xs:element name="long" nillable="true" type="xs:long" />
         <xs:element name="QName" nillable="true" type="xs:QName" />
         <xs:element name="short" nillable="true" type="xs:short" />
         <xs:element name="string" nillable="true" type="xs:string" />
         <xs:element name="unsignedByte" nillable="true" type="xs:unsignedByte" />
         <xs:element name="unsignedInt" nillable="true" type="xs:unsignedInt" />
         <xs:element name="unsignedLong" nillable="true" type="xs:unsignedLong" />
         <xs:element name="unsignedShort" nillable="true" type="xs:unsignedShort" />
         <xs:element name="char" nillable="true" type="tns:char" />
         <xs:simpleType name="char">
            <xs:restriction base="xs:int" />
         </xs:simpleType>
         <xs:element name="duration" nillable="true" type="tns:duration" />
         <xs:simpleType name="duration">
            <xs:restriction base="xs:duration">
               <xs:pattern value="\-?P(\d*D)?(T(\d*H)?(\d*M)?(\d*(\.\d*)?S)?)?" />
               <xs:minInclusive value="-P10675199DT2H48M5.4775808S" />
               <xs:maxInclusive value="P10675199DT2H48M5.4775807S" />
            </xs:restriction>
         </xs:simpleType>
         <xs:element name="guid" nillable="true" type="tns:guid" />
         <xs:simpleType name="guid">
            <xs:restriction base="xs:string">
               <xs:pattern value="[\da-fA-F]{8}-[\da-fA-F]{4}-[\da-fA-F]{4}-[\da-fA-F]{4}-[\da-fA-F]{12}" />
            </xs:restriction>
         </xs:simpleType>
         <xs:attribute name="FactoryType" type="xs:QName" />
         <xs:attribute name="Id" type="xs:ID" />
         <xs:attribute name="Ref" type="xs:IDREF" />
      </xs:schema>
      <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:ser="http://schemas.microsoft.com/2003/10/Serialization/" xmlns:tns="http://schemas.datacontract.org/2004/07/WebApplication1.Service" elementFormDefault="qualified" targetNamespace="http://schemas.datacontract.org/2004/07/WebApplication1.Service">
         <xs:import namespace="http://schemas.datacontract.org/2004/07/System" />
         <xs:import namespace="http://schemas.microsoft.com/2003/10/Serialization/Arrays" />
         <xs:complexType name="DTO">
            <xs:sequence>
               <xs:element minOccurs="0" name="MyStructs" nillable="true" type="tns:ArrayOfAnyStruct" />
            </xs:sequence>
         </xs:complexType>
         <xs:element name="DTO" nillable="true" type="tns:DTO" />
         <xs:complexType name="ArrayOfAnyStruct">
            <xs:sequence>
               <xs:element minOccurs="0" maxOccurs="unbounded" name="" type="xs:" />
            </xs:sequence>
         </xs:complexType>
         <xs:element name="ArrayOfAnyStruct" nillable="true" type="tns:ArrayOfAnyStruct" />
         <xs:complexType name="AnyStruct">
            <xs:sequence />
         </xs:complexType>
         <xs:element name="AnyStruct" nillable="true" type="tns:AnyStruct" />
      </xs:schema>
      <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:ser="http://schemas.microsoft.com/2003/10/Serialization/" xmlns:tns="http://schemas.microsoft.com/2003/10/Serialization/Arrays" elementFormDefault="qualified" targetNamespace="http://schemas.microsoft.com/2003/10/Serialization/Arrays">
         <xs:import namespace="http://schemas.microsoft.com/2003/10/Serialization/" />
      </xs:schema>
   </wsdl:types>
   <wsdl:message name="IMyService_Do_InputMessage">
      <wsdl:part name="parameters" element="tns:Do" />
   </wsdl:message>
   <wsdl:message name="IMyService_Do_OutputMessage">
      <wsdl:part name="parameters" element="tns:DoResponse" />
   </wsdl:message>
   <wsdl:portType name="IMyService">
      <wsdl:operation name="Do">
         <wsdl:input wsam:Action="http://tempuri.org/IMyService/Do" message="tns:IMyService_Do_InputMessage" />
         <wsdl:output wsam:Action="http://tempuri.org/IMyService/DoResponse" message="tns:IMyService_Do_OutputMessage" />
      </wsdl:operation>
   </wsdl:portType>
   <wsdl:binding name="BasicHttpBinding" type="tns:IMyService">
      <soap:binding transport="http://schemas.xmlsoap.org/soap/http" />
      <wsdl:operation name="Do">
         <soap:operation soapAction="http://tempuri.org/IMyService/Do" style="document" />
         <wsdl:input>
            <soap:body use="literal" />
         </wsdl:input>
         <wsdl:output>
            <soap:body use="literal" />
         </wsdl:output>
      </wsdl:operation>
   </wsdl:binding>
   <wsdl:service name="MyService">
      <wsdl:port name="BasicHttpBinding" binding="tns:BasicHttpBinding">
         <soap:address location="http://localhost:5000/MyService.svc" />
      </wsdl:port>
   </wsdl:service>
</wsdl:definitions>

[bartbovendeerdt]

@kotovaleksandr No, it still comes back with an error.

Invalid name character in 'xmlns:q1'. The ':' character, hexadecimal value 0x3A, cannot be included in a name.

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