C# Split用法

1、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
2、用多个字符来分隔：

 string str="aaajbbbscccjdddseee"; 
 string[] sArray=str.Split(new char[2] {'j','s'}); 
 foreach(string i in sArray) Response.Write(i.ToString() + "<br>"); 

输出结果：
aaa
bbb
ccc
ddd
eee
3、用单个字符来分隔：

 string str="aaajbbbjccc";
 string[] sArray=str.Split('j');
 foreach(string i in sArray) Response.Write(i.ToString() + "<br>");

输出结果：
aaa
bbb
ccc

////////////////////////////////////////////////

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

这是一个具有语法错误的语句，Split 的 separator 参数(數組)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：
程序代码

 1) public string[] Split(params char[] separator)
 2) public string[] Split(char[] separator, int count)
 3) public string[] Split(char[] separator, StringSplitOptions options)
 4) public string[] Split(string[] separator, StringSplitOptions options)
 5) public string[] Split(char[] separator, int count, StringSplitOptions options)
 6) public string[] Split(string[] separator, int count, StringSplitOptions options) 

下边我们通过一些实例来说明下怎么使用(以下string words = "1,2.3,,4";)：
1. public string[] Split(params char[] separator)

程序代码

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


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

程序代码

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


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

程序代码

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


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

程序代码

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


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

程序代码

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



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

程序代码

  string[] split = words.Split(new string[] { ",", "." }, 2, StringSplitOptions.RemoveEmptyEntries);
  //返回:{"1","2.3,,4"} 不保留空元素
  string[] split = words.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(','）

重載函數:
函數名相同,只是裏面的參數不同,這就叫重載函數

2017-03-13_162553.jpg