support for XmlEnumAttribute specifiying custom names for enum members

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

@@ -0,0 +1,15 @@
+using System.Xml.Serialization;
+
+namespace SoapCore.Tests.Wsdl.Services
+{
+	public enum EnumWithCustomNames
+	{
+		[XmlEnum("F")]
+		FirstEnumMember,
+
+		[XmlEnum("S")]
+		SecondEnumMember,
+
+		ThirdEnumMember
+	}
+}

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

@@ -0,0 +1,20 @@
+using System;
+using System.ServiceModel;
+
+namespace SoapCore.Tests.Wsdl.Services
+{
+	[ServiceContract]
+	public interface IEnumWithCustomNamesService
+	{
+		[OperationContract]
+		EnumWithCustomNames? GetEnum(string text);
+	}
+
+	public class EnumWithCustomNamesService : IEnumWithCustomNamesService
+	{
+		public EnumWithCustomNames? GetEnum(string text)
+		{
+			throw new NotImplementedException();
+		}
+	}
+}

src/SoapCore.Tests/Wsdl/WsdlTests.cs

@@ -593,6 +593,36 @@ public async Task CheckComplexComplexTypeWithCustomXmlNamesWsdl()
 			Assert.IsNotNull(testElementWithDefaultName);
 		}
 
+		[DataTestMethod]
+		public async Task CheckEnumWithCustomNamesXmlSerializedWsdl()
+		{
+			var wsdl = await GetWsdlFromMetaBodyWriter<EnumWithCustomNamesService>(SoapSerializer.XmlSerializer);
+			Trace.TraceInformation(wsdl);
+			Assert.IsNotNull(wsdl);
+
+			var root = XElement.Parse(wsdl);
+
+			//loading definition of EnumWithCustomNames
+			var enumWithCustomNamesElement = GetElements(root, _xmlSchema + "simpleType").FirstOrDefault(a => a.Attribute("name")?.Value.Equals("EnumWithCustomNames") == true);
+			Assert.IsNotNull(enumWithCustomNamesElement);
+
+			//checking restriction to be there
+			var testRestrictionOfEnumWithCustomNames = GetElements(enumWithCustomNamesElement, _xmlSchema + "restriction").SingleOrDefault();
+			Assert.IsNotNull(testRestrictionOfEnumWithCustomNames);
+
+			//checking enumeration elements to be there
+			var testEnumerationElements = GetElements(testRestrictionOfEnumWithCustomNames, _xmlSchema + "enumeration").ToList();
+			Assert.IsNotNull(testEnumerationElements);
+			Assert.AreEqual(3, testEnumerationElements.Count);
+
+			//checking custom names specified per XmlEnumAttribute are used
+			Assert.IsNotNull(testEnumerationElements.SingleOrDefault(e => e.FirstAttribute?.Value == "F"));
+			Assert.IsNotNull(testEnumerationElements.SingleOrDefault(e => e.FirstAttribute?.Value == "S"));
+
+			//checking default name specified by enum member
+			Assert.IsNotNull(testEnumerationElements.SingleOrDefault(e => e.FirstAttribute?.Value == "ThirdEnumMember"));
+		}
+
 		[DataTestMethod]
 		[DataRow(SoapSerializer.XmlSerializer)]
 		public async Task CheckOccuranceOfStringType(SoapSerializer soapSerializer)

src/SoapCore/Meta/MetaBodyWriter.cs

@@ -462,10 +462,29 @@ private void AddTypes(XmlDictionaryWriter writer)
 					writer.WriteStartElement("restriction", Namespaces.XMLNS_XSD);
 					writer.WriteAttributeString("base", $"{_xmlNamespaceManager.LookupPrefix(Namespaces.XMLNS_XSD)}:string");
 
-					foreach (var value in Enum.GetValues(toBuild))
+					var membersWithCustomNames = from n in Enum.GetNames(toBuild)
+												 join m in toBuild.GetMembers() on n equals m.Name
+												 let ca = m.CustomAttributes.FirstOrDefault(ca => ca.AttributeType == typeof(XmlEnumAttribute))
+												 select new
+												 {
+													 m.Name,
+													 CustomName =
+													 (ca?
+																	.ConstructorArguments?
+																	.FirstOrDefault()
+																	.Value
+																??
+																ca?
+																	.NamedArguments?
+																	.FirstOrDefault(a => a.MemberName == "Name")
+																	.TypedValue
+																	.Value)?
+																.ToString()
+												 };
+					foreach (var member in membersWithCustomNames)
 					{
 						writer.WriteStartElement("enumeration", Namespaces.XMLNS_XSD);
-						writer.WriteAttributeString("value", value.ToString());
+						writer.WriteAttributeString("value", member.CustomName ?? member.Name);
 						writer.WriteEndElement(); // enumeration
 					}