//构造soap请求信息
StringBuilder soap = new StringBuilder();
soap.Append("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
soap.Append("<soap:Envelope xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">");
soap.Append("<soap:Body>");
soap.Append("<HelloWord xmlns=\"http://tempuri.org/\" />");
soap.Append("</soap:Body></soap:Envelope>");StringBuilder soap = new StringBuilder();
soap.Append("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
soap.Append("<soap:Envelope xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">");
soap.Append("<soap:Body>");
soap.Append("<HelloWord xmlns=\"http://tempuri.org\" />");
soap.Append("</soap:Body></soap:Envelope>");xmlns有"/"和没有"/"的区别是什么