刚刚有网友在QQ问及，根据订单前缀，去查找与前缀匹配的订单号。

Insus.NET在控制台应用程序中，使用普通的方法来实现，参考下面代码示例：

 

using System;using System.Collections.Generic;using System.IO;using System.Linq;using System.Net;using System.Text;using System.Threading.Tasks;using ConsoleApplicationDemo.Geometric;namespace ConsoleApplicationDemo{    class Program    {        static void Main(string[] args)        {            List
      
        list = new List
       
        () {                "XS443694739104075776","","YP443694739104075776"            };            var tList = new List
        
         ();            foreach (var item in FilterPrefixOrderNoList)            {                foreach (var co in list)                {                    if (!string.IsNullOrEmpty(co) && co.Length >= item.Length && item == co.Substring(0, item.Length))                    {                        tList.Add(co);                    }                }            }            //输出            foreach (var rst in tList)            {                               Console.WriteLine(rst);            }        }        public static string[] FilterPrefixOrderNoList = { "TS", "XS", "YP" };    }}
        
       
      

 

上面#6行代码，可以修改一下，更加简洁：

 

foreach (var item in FilterPrefixOrderNoList)            {                foreach (var co in list)                {                    // if (!string.IsNullOrEmpty(co) && co.Length >= item.Length && item == co.Substring(0, item.Length))                    if (co.StartsWith(item))                    {                        tList.Add(co);                    }                }            }