肥皂响应返回值（Fiddler），但在代码中返回null

Question

我的场景：我添加了服务引用，并使用代理类来调用特定的soap服务。当我查询soap服务并且响应仅包含一组值时，它可以正常工作，但是例如，如果我查询某个姓氏，它将返回一组SET值，则代码显示响应为null，即使使用Fiddler检查时也认为这些值是被退回。

SoapService.queryWebServiceSoapPortClient client = new SoapService.queryWebServiceSoapPortClient();
        client.ClientCredentials.UserName.UserName = userID;
        client.ClientCredentials.UserName.Password = Password;

        SoapService.qwsInput query1 = new SoapService.qwsInput();
        SoapService.queryResponse response = new SoapService.queryResponse();

        query1.userId = userID;
        query1.pass = Password;
        query1.queryId = queryId;
        query1.qwsInputParams = InputParam;

        query a = new query();

        a.queryInput = query1;

        try
        {


            response = client.query(a);
        }
        catch (Exception error)
        {

            var b = error.ToString();
        }