OperationContext.Current.SessionId获得空

Question

当我调用服务GetSessionId()时，会话id将获得空值。请帮我解决这个问题。

public Response<string> GetSessionId()
{
    Response<string> respn = new Response<string>();
    respn.Succeeded = false;

    try
    {
        _sessionId = OperationContext.Current.SessionId;
        respn.ReturnData = _sessionId;
        respn.Succeeded = true;
    }
    catch (Exception ex)
    {
        respn.Succeeded = false;
        respn.ErrorMsg = ex.Message;
    }
    return respn;
}

在Web.Config文件中，如果我设置为mode="Message“和clientCredentialType="Windows”，在这种情况下，它将得到会话id.But，我不能使用任何安全性。

<wsHttpBinding>
    <binding name="SOAPService_EndpointBinding"
             maxReceivedMessageSize="2147483647"
             openTimeout="00:02:00"
             closeTimeout="00:02:00"
             sendTimeout="24:00:00"
             receiveTimeout="24:00:00">          
      <security mode="None">
        <message clientCredentialType="None"/>
      </security>
    </binding>
  </wsHttpBinding>

Answer 1

解决办法如下，

契约接口中的，将SessionMode属性设置为必需的

ServiceContract(SessionMode = SessionMode.Required)

在配置文件中启用了reliableSession

<wsHttpBinding>
    <binding name="SOAPService_EndpointBinding"
             maxReceivedMessageSize="2147483647"
             openTimeout="00:02:00"
             closeTimeout="00:02:00"
             sendTimeout="24:00:00"
             receiveTimeout="24:00:00">          
      <security mode="None">
        <message clientCredentialType="None"/>
      </security>
      <reliableSession enabled="true"/>
    </binding>
  </wsHttpBinding>

Answer 2

您正在使用的绑定是什么？会话支持以下绑定

• NetTcpBinding
• NetNamedPipeBinding
• WSHttpBinding (仅在打开安全性或可靠性的情况下)