Split函数

描述：返回一个下标从0开始的一维数组，它包含指定数目的子字符串

实例：

1.用单个字符分隔

string str1 = "1,2,3";

string [] str = str1.split(','); //得到：{"1","2","3"}

foreach(string s in str){

Response.Write( s+"<br/>");

}

输出结果：//1

//2

//3

2.用多个字符分隔

string str1 = "1,2,3.4"

string str2 = str1.split(new char[2]{',','.'});

foreach(string s in str2){

Response.Write(s+"<br/>");

}

输出结果：//1

//2

　　　　　　 //3

　　　　　　　//4

3.用字符串分隔

using System.Text.RegularExpressions;
string str="aaajsbbbjsccc";
string[] sArray=Regex.Split(str,"js",RegexOptions.IgnoreCase);
foreach (string i in sArray) {

Response.Write(i.ToString() + "<br>");

}
输出结果：
aaa
bbb
ccc

总结提高：

string[] arr = str.Split("o");

这是一个具有语法错误的语句，Split 的 separator参数应该是 char[] 或 string[]，不应是字符串。正确的示例：

string str = "technology";
char[] separator = { 'o' };
string[] arr = str.Split(separator);

String.Split 方法有6个重载函数：以下string str= "1,2.3,,4";

public string[] Split(params char[] separator)

string[] split = str.Split(new Char[] { ',' });//返回:{"1","2.3","","4"}
string[] split = str.Split(new Char[] { ',', '.' });//返回:{"1","2","3","","4"}

public string[] Split(char[] separator, int count)

　　 string[] split = str.Split(new Char[] { ',', '.' }, 2);//返回:{"1","2.3,,4"}
string[] split = str.Split(new Char[] { ',', '.' }, 6);//返回:{"1","2","3","","4"}

public string[] Split(char[] separator, StringSplitOptions options)

string[] split = str.Split(new Char[] { ',', '.' }, StringSplitOptions.RemoveEmptyEntries);//返回:{"1","2","3","4"} 不保留空元素
string[] split = str.Split(new Char[] { ',', '.' }, StringSplitOptions.None);//返回:{"1","2","3","","4"} 保留空元素

public string[] Split(string[] separator, StringSplitOptions options)

string[] split = str.Split(new string[] { ",", "." }, StringSplitOptions.RemoveEmptyEntries);//返回:{"1","2","3","4"} 不保留空元素
string[] split = str.Split(new string[] { ",", "." }, StringSplitOptions.None);//返回:{"1","2","3","","4"} 保留空元素

public string[] Split(char[] separator, int count, StringSplitOptions options)

string[] split = str.Split(new Char[] { ',', '.' }, 2, StringSplitOptions.RemoveEmptyEntries);//返回:{"1","2.3,,4"} 不保留空元素
string[] split = str.Split(new Char[] { ',', '.' }, 6, StringSplitOptions.None);//返回:{"1","2","3","","4"} 保留空元素

public string[] Split(string[] separator, int count, StringSplitOptions options)

string[] split = str.Split(new string[] { ",", "." }, 2, StringSplitOptions.RemoveEmptyEntries);//返回:{"1","2.3,,4"} 不保留空元素
string[] split = str.Split(new string[] { ",", "." }, 6, StringSplitOptions.None);//返回:{"1","2","3","","4"} 保留空元素

需要注意的是没有重载函数public string[] Split(string[] separator)，所以我们不能像VB.NET那样使用words.Split(",")，而只能使用words.Split(',')

要么生，要么死