C# WCF在OperationContext中设置用户ID

Im在我的WCF服务应用程序中有一个自定义验证器，我使用标准的Microsoft标识表验证用户名和密码

此函数返回用户的数据，包括用户ID（Guid）

现在我想在operationContext中添加UserID，以便稍后在som其他函数中使用该UserID

OperationContext.Current.ServiceSecurityContext.AuthorizationContext.Properties["UserID"] = user.UserID;

但当我这样做时，我会收到错误消息“对象引用未设置为对象的实例”。这并不奇怪，因为我没有创建它的实例。但我不知道怎么做

因此，我的问题是如何从Validate函数将UserID保存在OperationContext中，以便在其他函数中重用UserID

namespace Facilicom.SOA.Service.FSE.Implementation.Authentication

{

public class IdentityValidator : UserNamePasswordValidator
{

public override void Validate(string userName, string password)

    {

        Debug.WriteLine("Check user name");
        User user = new IdentityAuthenticator().ValidateUser(userName, password);
        if (user != null)
            OperationContext.Current.ServiceSecurityContext.AuthorizationContext.Properties["UserID"] = user.UserID;
        else
        {
            var msg = String.Format("You are not authorized");
            Trace.TraceWarning(msg);
            throw new FaultException(msg);//the client actually will receive MessageSecurityException. But if I throw MessageSecurityException, the runtime will give FaultException to client without clear message.
        }
       }
    } 
}

namespace Facilicom.SOA.Service.FSE.Implementation.Authentication

{

public class IdentityValidator : UserNamePasswordValidator
{

public override void Validate(string userName, string password)

    {

        Debug.WriteLine("Check user name");
        User user = new IdentityAuthenticator().ValidateUser(userName, password);
        if (user != null)
            OperationContext.Current.ServiceSecurityContext.AuthorizationContext.Properties["UserID"] = user.UserID;
        else
        {
            var msg = String.Format("You are not authorized");
            Trace.TraceWarning(msg);
            throw new FaultException(msg);//the client actually will receive MessageSecurityException. But if I throw MessageSecurityException, the runtime will give FaultException to client without clear message.
        }
       }
    } 
}