c#后台移除某个元素方法总结

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace 测试控制台{    public class 移除元素    {        public void c()        {            string bu = "8177,-1,289327,289328,289329,289330,289331,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1";            //移除某个元素 方法一            string[] arrkey = bu.Split(',');            string tmp = string.Empty;            for (int i = 0; i < arrkey.Length; i++)            {                if (arrkey[i] != "-1")                {                    tmp += arrkey[i] + ",";                }            }            tmp = tmp.TrimEnd(',');//8177,289327,289328,289329,289330,289331            //移除某个元素 方法二    linq表达式            List<string> la = bu.Split(',').ToList();            var newArr2 = from i in la where i != "-1" select i;            tmp = string.Join(",", newArr2);//8177,289327,289328,289329,289330,289331            //移除某个元素 方法三    委托            List<string> la2 = bu.Split(',').ToList();            la2.RemoveAll(n => n == "-1");            tmp = string.Join(",", la2);//8177,289327,289328,289329,289330,289331            //总结            // Predicate<T>委托            //方法：RemoveAll(Predicate<T> match);//参数是泛型委托            //用法：la2.RemoveAll(n => bool表达式)        }    }}