为什么这个扩展方法没有初始化返回的对象？

Question

我编写了一个通用的Extension helper方法来初始化SoapHeader的一些参数,但是它没有更新返回的对象.

我错过了什么？

using System.Web.Services.Protocols;

    public class Header: SoapHeader {}

    public class WS {
      public Header securityHeader {
        get;
        set;
      }

    }
    public static class SecurityHeaderExtensions {

      public static T GetSecurityHeader < T > (this T header, string actor, string role) where T: SoapHeader, new() {

        T result = new T() {
          Actor = actor, Role = role
        };

        Console.WriteLine("Actor: " + actor); //prints actor
        Console.WriteLine("Actor: " + result.Actor); //prints blank
        return result;

      }
    }

    void Main() {
      var ws = new WS();
      ws.securityHeader = ws.securityHeader.GetSecurityHeader("actor", null);

    }

Answer 1

看来,Actor和Role是相同的领域内.

将其设置为actor然后将其设置为null意味着它是null.

该数据的接收者,在SOAP规范的1.2版中称为SOAP 角色,在1.1版中称为SOAP Actor