DataContract containing IList<struct> produces invalid WSDL DigDes#346

src/SoapCore.Tests/Wsdl/Services/IStructsService.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Collections.Generic;
+using System.Runtime.Serialization;
+using System.ServiceModel;
+using System.Text;
+
+namespace SoapCore.Tests.Wsdl.Services
+{
+	[ServiceContract]
+	public interface IStructsService
+	{
+		[OperationContract]
+		void Method(StructService.StructModel model);
+	}
+
+	public class StructService : IStructsService
+	{
+		public void Method(StructModel model)
+		{
+			throw new NotImplementedException();
+		}
+
+		[DataContract]
+		public struct AnyStruct
+		{
+			public int Prop { get; set; }
+		}
+
+		[DataContract]
+		public class StructModel
+		{
+			[DataMember]
+			public IList<AnyStruct> MyStructs { get; set; }
+		}
+	}
+}

src/SoapCore.Tests/Wsdl/WsdlTests.cs

@@ -91,6 +91,27 @@ public void CheckNonNullableEnum()
 			simpleTypeElements.ShouldNotBeEmpty();
 		}
 
+		[TestMethod]
+		public void CheckStructsInList()
+		{
+			StartService(typeof(StructService));
+			var wsdl = GetWsdl();
+			StopServer();
+			var root = XElement.Parse(wsdl);
+			var elementsWithEmptyName = GetElements(root, _xmlSchema + "element").Where(x => x.Attribute("name")?.Value == string.Empty);
+			elementsWithEmptyName.ShouldBeEmpty();
+
+			var elementsWithEmptyType = GetElements(root, _xmlSchema + "element").Where(x => x.Attribute("type")?.Value == "xs:");
+			elementsWithEmptyType.ShouldBeEmpty();
+
+			var structTypeElement = GetElements(root, _xmlSchema + "complexType").Single(x => x.Attribute("name")?.Value == "AnyStruct");
+			var annotationNode = structTypeElement.Descendants(_xmlSchema + "annotation").SingleOrDefault();
+			var isValueTypeElement = annotationNode.Descendants(_xmlSchema + "appinfo").Descendants(XNamespace.Get("http://schemas.microsoft.com/2003/10/Serialization/") + "IsValueType").SingleOrDefault();
+			Assert.IsNotNull(isValueTypeElement);
+			Assert.AreEqual("true", isValueTypeElement.Value);
+			Assert.IsNotNull(annotationNode);
+		}
+
 		[TestMethod]
 		public void CheckStreamDeclaration()
 		{

src/SoapCore/Meta/MetaWCFBodyWriter.cs

@@ -718,6 +718,18 @@ private void WriteComplexType(XmlDictionaryWriter writer, Type type)
 			writer.WriteAttributeString("name", toBuildName);
 			writer.WriteAttributeString("xmlns:ser", SERIALIZATION_NS);
 
+			if (type.IsValueType && ResolveSystemType(type).name == null)
+			{
+				writer.WriteStartElement("xs:annotation");
+				writer.WriteStartElement("xs:appinfo");
+				writer.WriteStartElement("IsValueType");
+				writer.WriteAttributeString("xmlns", SERIALIZATION_NS);
+				writer.WriteValue(true);
+				writer.WriteEndElement();
+				writer.WriteEndElement();
+				writer.WriteEndElement();
+			}
+
 			var hasBaseType = HasBaseType(type);
 
 			if (hasBaseType)
@@ -1024,11 +1036,16 @@ private void AddSchemaType(XmlDictionaryWriter writer, Type type, string name, b
 						xsTypename = $"{(sysType.ns == SERIALIZATION_NS ? "ser" : "xs")}:{sysType.name}";
 						writer.WriteAttributeString("nillable", "true");
 					}
-					else
+					else if (ResolveSystemType(type).name != null)
 					{
 						var sysType = ResolveSystemType(type);
 						xsTypename = $"{(sysType.ns == SERIALIZATION_NS ? "ser" : "xs")}:{sysType.name}";
 					}
+					else
+					{
+						var ns = $"q{_namespaceCounter++}";
+						xsTypename = $"{ns}:{typeName}";
+					}
 				}
 
 				writer.WriteAttributeString("minOccurs", "0");