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我在 SO (http://stackoverflow.com/questions/5801128/flat-wsdl-for-wcf-4-service) 找到了这个服务主机，我用它来确定我想要的类的属性是 nillable=false 而不是默认的 true。我设法做到了，但现在需要实现一些逻辑来自动化这个功能。

主持人：

using System;
using System.Collections;
using System.Collections.Generic;
using System.ServiceModel.Channels;
using System.ServiceModel.Description;
using System.ServiceModel.Dispatcher;
using System.Xml.Schema;
using ServiceDescription = System.Web.Services.Description.ServiceDescription;

namespace Thinktecture.ServiceModel.Extensions.Description {
    public class FlatWsdl : IWsdlExportExtension, IEndpointBehavior {
        public void ExportContract(WsdlExporter exporter, WsdlContractConversionContext context) {}

        public void ExportEndpoint(WsdlExporter exporter, WsdlEndpointConversionContext context) {
            XmlSchemaSet schemaSet = exporter.GeneratedXmlSchemas;

            ProcessNillable(schemaSet);
            ...
            ...
        }

        private static void WalkTheParticle(XmlSchemaParticle particle)
        {
            if (particle is XmlSchemaElement) {
                XmlSchemaElement elem = particle as XmlSchemaElement;

                Console.WriteLine(elem.Name);

                if (elem != null && String.Compare(elem.Name, "name", false) == 0)
                {
                    elem.IsNillable = false; //This works!
                    Console.WriteLine("Bazinga!");
                }

                if (elem.RefName.IsEmpty) {
                    XmlSchemaType type = (XmlSchemaType)elem.ElementSchemaType;
                    if (type is XmlSchemaComplexType) {
                        XmlSchemaComplexType ct = type as XmlSchemaComplexType;
                        if (ct.QualifiedName.IsEmpty) {
                            WalkTheParticle(ct.ContentTypeParticle);
                        }
                    }
                }
            }
            else if (particle is XmlSchemaGroupBase)
            //xs:all, xs:choice, xs:sequence
            {
                XmlSchemaGroupBase baseParticle = particle as XmlSchemaGroupBase;
                foreach (XmlSchemaParticle subParticle in baseParticle.Items)
                {
                    WalkTheParticle(subParticle);
                }
            }
        }

        private static void AddImportedSchemas(XmlSchema schema, XmlSchemaSet schemaSet, List<XmlSchema> importsList) { ... }

        private static void RemoveXsdImports(XmlSchema schema) { ... }

        public void AddBindingParameters(ServiceEndpoint endpoint, BindingParameterCollection bindingParameters) {}

        public void ApplyClientBehavior(ServiceEndpoint endpoint, ClientRuntime clientRuntime) {}

        public void ApplyDispatchBehavior(ServiceEndpoint endpoint, EndpointDispatcher endpointDispatcher) {}

        public void Validate(ServiceEndpoint endpoint) {}
    }
}

现在，它可以在示例项目中使用，我需要将其放入实际项目中，其中包含大约 80 个合同，每个合同都足够复杂以拥有许多属性。有些是必需的，有些不是。我需要弄清楚如何自动取消所需的 nillable=true 。我希望放置[DataMember(IsRequired=True)]可以帮助我在上述WalkTheParticle()方法中找到该属性。但是，一旦进入该方法，除了元素的名称之外，我没有其他真正的东西可以让这项工作发挥作用，维护一个属性列表以标记为不可空是一件真正令人头疼的事情。我正在寻找更好的解决方案。

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