StringBuilder&&Split方法

---

---

StringBuilder构造方法

不必刻意记忆,实际写代码过程中，编辑器会有提示

StringBuilder基本方法（一） StringBuilder基本方法（二）

static void Main(string[] args)
        {
            StringBuilder s1 = new StringBuilder();
            StringBuilder s2 = new StringBuilder(20);
            StringBuilder s3 = new StringBuilder("Hello World!");
            StringBuilder s4 = new StringBuilder(20,50);
            StringBuilder s5 = new StringBuilder("Hello World!",50);
            StringBuilder s6 = new StringBuilder("Hello World!",2,6,50);
            Console.WriteLine(s6);

            bool xBool = true;
            bool yBool = false;
            char star = '*';
            string s = "interesting";
            string ss = "ab";
            char[] ch = { 'a', 'b', 'c' };
            int iNum = 789;float fNum = 2.34f;
            Console.WriteLine(s3.Append(yBool));
            Console.WriteLine(s3.Append(star,3));
            Console.WriteLine(s3.Append(s,2,5));

            Console.WriteLine(s3.AppendFormat("先加{0}，注意有逗号，再加{1}",iNum,fNum));

            Console.WriteLine(s6.Insert(2,yBool));
            Console.WriteLine(s6.Insert(2,ss,2));         //ss只能是字符串
            Console.WriteLine(s6.Insert(1,ch,1,2));      //ch只能是字符数组

            Console.WriteLine(s6.Remove(5,4));

            Console.WriteLine(s6.Replace('a','A'));
            Console.WriteLine(s6.Replace("bcl","hahaha"));
            Console.WriteLine(s6.Replace('A','a',5,3));

            Console.WriteLine(s6[4]);

            Console.WriteLine(s6.Length);
        }

---

---

字符串的Split方法

两种常用的格式：
字符串.Split(字符数组);
字符串.Split(字符数组,返回的字符串的最大的数量);

string[] strArray = sb1.ToString().Split(new Char[] { ',', '.', '!', ':', ';' });
 string[] strArray = sb1.ToString().Split(new Char[] { ',', '.', '!', ':', ';' },3);

严格按照分隔符分割，没有个数要求
分成3部分