常用字符串总结

Posted 2021-11-24 micc

1. 字符串基础《一》

2. static void Main(string[] args)
           {
               string str1 = "I Love You";
               string str2 = "这里是北京";
               string[] strArr = {"A","B","C","D","E","F" };
               char[] chr = { ‘1‘, ‘2‘, ‘3‘, ‘4‘, ‘5‘, ‘6‘ };
   
               string newValue = new string(chr); // 灵活将char数组组合成一个字符串:"123456"
   
               Console.WriteLine(newValue);
   
               newValue = new string(‘a‘, 2);  //重复输出前面的char字符，得到一个新的字符串："aa"
   
               Console.WriteLine(newValue);
   
               int comNum = string.Compare(str1, str2);
               //如果str1 > str2 则返回1，否则返回 -1；等于返回0
   
               Console.WriteLine(comNum);
   
               newValue = string.Concat(str1, str2); //将两个字符串连接起来，组成新字符串
               Console.WriteLine(newValue);
   
              newValue = string.Format("{0}-{1}", str1,str2,chr[0]); //格式化输出，注意前面的占位符智能小于或等于后面的值
   
               Console.WriteLine(newValue);
   
               newValue = string.Join(",,", strArr);  //用两个逗号将字符串数组，组成新的字符串输出
   
               Console.WriteLine(newValue);
   
               bool isStrNull = string.IsNullOrEmpty(str1);  //判断字符串是否为空，不为空返回False，为空返回True
               Console.WriteLine(isStrNull);