c# – 如何在wcf服务中获得会话ID

我正在编写一个具有多种方法的身份验证服务.此方法的一部分是ChangePassword.我想当任何机构想要更改密码,之前登录系统.为此我想要一个会话ID并在更改传递之前检查它.

我怎么能这样做,并且会议时间过去了吗？

编辑1)

我写这段代码,但每次我想要得到它的值时,我的会话都是null：

类：

[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Required)]
public class Service2 : IService2
{
    string result
    {   // Store result in AspNet session.
        get
        {
            if (HttpContext.Current.Session["Result"] != null)
                return HttpContext.Current.Session["Result"].ToString();
            return "Session Is Null";
        }
        set
        {
            HttpContext.Current.Session["Result"] = value;
        }
    }

    public void SetSession(string Val)
    {
        result = Val;
    }

    public string GetSession()
    {
        return result;
    }

接口：

[ServiceContract(SessionMode = SessionMode.Required)]
public interface IService2
{
    [OperationContract]
    void SetSession(string Val);

    [OperationContract]
    string GetSession();
}

web.config中

<serviceHostingEnvironment multipleSiteBindingsEnabled="true" aspNetCompatibilityEnabled="true" />

编辑2)
我写了这段代码,但它不起作用：

private void button1_Click(object sender,EventArgs e)
    {
        MyService2.Service2Client srv = new MyService2.Service2Client();
        textBox1.Text = srv.GetSession();

    }

    private void button2_Click(object sender,EventArgs e)
    {
        MyService2.Service2Client srv = new MyService2.Service2Client();
        srv.SetSession(textBox1.Text);
        textBox1.Clear();
    }

每次我想获得Session值时,我都会得到“Session is Null”.为什么？

<services>
  <service name="MyService">
    <endpoint address="" binding="wsHttpBinding"
    bindingConfiguration="WSHttpBinding_MyServiceConfig"
    contract="IMyService">
      <identity>
        <dns value="localhost" />
      </identity>
    </endpoint>
  </service>
  </services>

[ServiceContract(SessionMode = SessionMode.Required)]
public interface IMyService
{
    [OperationContract]
    AuthenticationData Authenticate(string username,string password);
}

var sessionId = OperationContext.Current.SessionId;