C# 两个字符串的比较

            string StrA = "ABCDE";
            string StrB = "AE";
            char[] ArryA = StrA.ToCharArray();
            char[] ArryB = StrB.ToCharArray();
            int number = 0;
            for (int j = 0; j < ArryA.Length; j++)
            {
                for (int i = 0; i < ArryB.Length; i++)
                {
                    if (ArryA[j].Equals(ArryB[i]))
                    {
                        number++;
                    }
                }
            }
            if (number == StrB.Length)
            {
                Console.WriteLine("true");
            }
            else
            {
                Console.WriteLine("false");
            }
            Console.ReadKey();