代码

        static void Main(string[] args)
        {
            string str = "123abc";
            string strdelete = "abc";
            string str1 = str.Trim('1');
            string strc = str1.Trim('c');
            string str11 = str1.TrimStart('1');
            string strcc = str1.TrimEnd('c');
            string strabc = str.Trim(strdelete.ToCharArray());
            Console.WriteLine(str1);
            Console.WriteLine(str11);
            Console.WriteLine(strc);
            Console.WriteLine(strcc);
            Console.WriteLine(strabc);
            Console.ReadLine();
        }

结果