小白学习笔记C#进阶(1) string字符串

1.定义string类型字符串，查询字符串长度，字符串连接，索引器访问字符串字符，

static void Main(string[] args)
        {
            string a = "柴可夫斯基第一钢琴协奏曲";   //string类型存储字符串
            int length = a.Length;  //字符串长度查询
            if (a == "钢琴曲")
            {
                Console.Write("相同");
            }
            else
            {
                Console.Write("不相同");
            }
            a = "TschaiKowsky" + a;
            char b = a[2];   //字符查询
            for (int i = 0; i < a.Length; i++)
            {
                Console.WriteLine(a[i]);
            }
            int c = a.CompareTo("lalala");   //比较字符串，相等为0，不相等-1
            Console.WriteLine(b);
            Console.ReadKey();
        }

 2.拆分字符串

static void Main(string[] args)
        {
            string a = "1111,2222,3333";
            string[] strArray = a.Split(',');
            foreach (var temp in strArray)
            {
                Console.WriteLine(temp);
            }
            Console.ReadKey();
        }

3.检索给定位置的字符串

static void Main(string[] args)
        {
            string a = "柴可夫斯基第一钢琴协奏曲";
            string str = a.Substring(0,5);  //一段字符串
            string str1 = a.Substring(0);  //从头到尾
            Console.WriteLine(str);

            Console.ReadKey();
        }

4.大小写转化

 static void Main(string[] args)
        {
            string a = "aaaaaaasasasas";
            string str = a.ToUpper();
            string str1 = a.ToLower();
            Console.WriteLine(str);
            Console.ReadKey();
        }

5.删除首尾字符串

static void Main(string[] args)
        {
            string a = "     aaaaaaasasasas        ";
            string str = a.Trim();
            string str1 = a.TrimEnd();
            string str2 = a.TrimStart();
            Console.WriteLine(str);
            Console.ReadKey();
        }