c#自動生成的web服務代理clientbase如何增加cookie

MyWebServiceClient client = new MyWebServiceClient();

using ( new OperationContextScope( client.InnerChannel ) )

{

    HttpRequestMessageProperty request = new HttpRequestMessageProperty();

    request.Headers["Cookie"] = "cookie header value";

    OperationContext.Current.OutgoingMessageProperties[

        HttpRequestMessageProperty.Name] = request;

    client.InvokeSomeMethod();

}