c# - WebService、WebMethod 和继承

Question

在 Web 服务上下文中，我有以下继承自 Mammal 类的类。 Mammal 类在代理中定义。我无法更改该类的定义。因为需要在客户端给Mammal类添加一些方法，所以继承了Mammal创建了Giraffe。

namespace TestApplication
{  
    public class Giraffe : Mammal
    {
        public Giraffe()
        {
        }
    }
}

当我调用需要 Mammal 类型对象的 WebMethod 时，出现以下异常，告诉我 Giraffe 不是预期对象。

  Error: System.InvalidOperationException: There was an error generating the XML document. ---> System.InvalidOperationException: The type Giraffe was not expected. Use the XmlInclude or SoapInclude attribute to specify types that are not known statically.
   at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriterPaymentRequestAuthorization.Write6_Tender(String n, String ns, Tender o, Boolean isNullable, Boolean needType)
   at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriterPaymentRequestAuthorization.Write12_PaymentRequestAuthorization(String n, String ns, PaymentRequestAuthorization o, Boolean isNullable, Boolean needType)
   at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriterPaymentRequestAuthorization.Write13_PaymentRequestAuthorization(Object o)
   --- End of inner exception stack trace ---

有解决办法吗？我真的不能添加 XmlInclude...

Answer 1

要添加方法，您应该使用分部类。尝试添加第二个类文件(在正确的命名空间等中):

partial class Mammal {
    public void ExtraMethod() {...}
}

partial 关键字告诉编译器允许将类拆分为多个文件——代码生成场景的理想选择。但是，它确实要求在每个文件中使用 partial 关键字；成员只是简单组合(C# 3.0 中的部分方法除外，它们有自己的微妙行为)。我希望 wsdl.exe(或其他)包含这个!