为什么这个扩展方法不初始化返回的对象？

Question

我写了一个通用的扩展助手方法来初始化 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在内部是同一个字段。

将其设置为 actor 然后将其设置为 null 意味着它是 null.

The recipient of that data, known as the SOAP Role in version 1.2 of the SOAP specification and the SOAP Actor in version 1.1

为什么这个扩展方法不初始化返回的对象？

Why does this extension method not initialize the returned object?

c#

generics

extension-methods