字符串的操作方法

1.索引字符串中的单个字符

string str = “abcd”;

char c = str[0];

2.字符串连接

string s1 = “My age = “;

int myAge = 28;

string cat = s1 + myAge;

3.抽取和定位子串

string poem = “In Xanadu did Kubla Khan”;

string poemSeg = poem.Substring(10);

poemSeg = poem.Substring(0,9);

int index = poem.IndexOf(“I”);

index = poem.LastIndexOf(“n”);

4.比较字符串

bool isMatch;

string title = "Ancient Mariner";

isMatch = (title == "ANCIENT AMRINER");

isMatch = (title.ToUpper() == "ANCIENT MARINER");

isMatch = title.Equals("Ancient Mariner");