C # write webservice (2)

Due to its own knowledge limitations, it is not known whether this is correct or not, and it is for reference only.
The webservice I understand is a function placed on the network.

Then simply implement this function below:
two computers 1 and 2.
Our order is placed on computer 1, which provides a function order_query () at the front desk to query orders. Computer 2 calls this function to determine whether the user has placed an order.

---

The following is the asmx file on computer 1, assuming that the order information is saved in xml.

using System;
using System.Xml;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;

namespace WebApplication2
{
    /// <summary>
    /// WebService1 的摘要说明
    /// </summary>
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [System.ComponentModel.ToolboxItem(false)]
    // 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消对下行的注释。
    // [System.Web.Script.Services.ScriptService]
    public class WebService1 : System.Web.Services.WebService
    {

        [WebMethod]
        public string[] order_query(string cus_name, string cus_id)
        {
            
            //初始化一个xml实例
            XmlDocument myXmlDoc = new XmlDocument();
            //加载xml文件（参数为xml文件的路径）
            myXmlDoc.Load("C:\\Users\\DELL\\Desktop\\web\\WebApplication2\\WebApplication2\\XMLFile1.xml");
            XmlNode rootNode = myXmlDoc.SelectSingleNode("order_summary");
            //分别获得该节点的InnerXml和OuterXml信息 

            string innerXmlInfo = rootNode.InnerXml.ToString();
            string outerXmlInfo = rootNode.OuterXml.ToString();
            string[] r = new string[30];
            int i = 0;
            XmlNodeList firstLevelNodeList = rootNode.ChildNodes;//customer
            for (int m = 0; m < firstLevelNodeList.Count; m++)
            {
                XmlNodeList tepNodeList = firstLevelNodeList[m].ChildNodes;//customer的子节点
                if (tepNodeList[0].ChildNodes[0].InnerText != cus_name || tepNodeList[0].ChildNodes[1].InnerText != cus_id) continue;
                foreach (XmlNode node in tepNodeList)
                {//node=cus_info,order,detail
                    if (node.HasChildNodes)
                    {

                        int tep = node.ChildNodes.Count;
                        for (int j = 0; j < tep; j++)
                        {
                            if (tep != 1)
                            {

                                r[i] = node.ChildNodes[j].Name + ":  ";
                                if (node.ChildNodes[j].ChildNodes.Count != 1)
                                {
                                    foreach (XmlNode tepNode in node.ChildNodes[j].ChildNodes)
                                    {
                                        r[i] += tepNode.Name + ":" + tepNode.InnerText + "      ";
                                    }
                                }
                                else r[i] += node.ChildNodes[j].InnerText;
                                i++;
                            }
                            else r[i++] = node.ChildNodes[j].InnerText;
                        }
                    }

                }
            }
            string[] ans;
            if (i == 0)
            {
                ans = new string[1];
                ans[0] = "未找到该用户";
            }

            else
            {
                ans = new string[i];
                for (int j = 0; j < i; j++) ans[j] = r[j];
            }
            return ans;
        }
    }
}

xml code:

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="style1.xsl"?>
<order_summary>
  <customer>
    <cus_info>
      <cus_name>球球</cus_name>
      <cus_id>94188</cus_id>
      <cus_phone>110110110</cus_phone>
      <cus_address>中国台湾高雄</cus_address>
    </cus_info>
    <detail>
      <order_id>013254889974</order_id>
      <pay_way>支付宝</pay_way>
      <pay_time>2018.05.31 16:40</pay_time>
    </detail>
    <order>
      <food>
        <name>鸡肉味狗粮</name>
        <price>20元/g</price>
        <money>500元</money>
        <description>美味鸡肉狗粮，爱不释口</description>
      </food>
      <food>
        <name>大海猫粮</name>
        <price>30元/g</price>
        <money>900元</money>
        <description>让猫拥有大海般的感觉</description>
      </food>
    </order>
    <tot_price>1400元</tot_price>
    <state>true</state>
  </customer>
  <customer>
    <cus_info>
      <cus_name>彤彤</cus_name>
      <cus_id>94187</cus_id>
      <cus_phone>17867842272</cus_phone>
      <cus_address>中国青岛烟台36号</cus_address>
    </cus_info>
    <detail>
      <order_id>013254889979</order_id>
      <pay_way>null</pay_way>
      <pay_time>null</pay_time>
    </detail>
    <order>
      <food>
        <name>炸鸡腿</name>
        <price>20元/个</price>
        <money>20元</money>
        <description>美味鸡肉</description>
      </food>
      <food>
        <name>螺蛳粉</name>
        <price>10元/碗</price>
        <money>10元</money>
        <description>酸酸爽爽的粉粉</description>
      </food>
    </order>
    <tot_price>30元</tot_price>
    <state>false</state>
  </customer>
</order_summary>

After we publish the website, we must also authorize it, otherwise the access will fail. For simplicity here, make it accessible to everyone.
Right-click on this xml file, safe, so that it can be accessed.
Edit the code and try:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            WebReference.WebService1 am = new WebReference.WebService1();
           string[] ab=am.order_query("球球", "94188");
           for (int i = 0; i < ab.Length; i++)
           {
               Console.WriteLine(ab[i]);
           }
        }
    }
}

Screenshot below,