C#中split的方法

字符串的處理往往離不開split方法，下面介紹幾種split的用法：

1.對單個字符進行分割（注意這里是字符，不是字符串，故只能用單引號‘’） 

string s=abcdeabcdeabcde;
string[] sArray=s.Split('c') ;
foreach(string i in sArray)
Console.WriteLine(i.ToString());

   輸出下面的結果:ab deab deab de

 2.對多個字符進行分割

string s="abcdeabcdeabcde";
string[] sArray1=s.Split(new char[3]{'c','d','e'}) ;
foreach(string i in sArray1)
Console.WriteLine(i.ToString());

輸出下面的結果：ab ab ab

3.使用正則表達式

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

 輸出結果：aaa bbb ccc

using System.Text.RegularExpressions;

string str1="我**是*****一*****個*****教*****師";

string[] sArray=Regex.Split(str1,@[*]+); 

foreach (string i in sArray) Response.Write(i.ToString());

 輸出結果：我是一個教師

注意：

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

這是一個具有語法錯誤的語句，Split 的 separator 參數應該是 char[] 或 string[]，不應是字符串。正確的示例：

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

String.Split 方法有6個重載函數：

程序代碼

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)

下邊我們通過一些實例來說明下怎么使用(以下string words = "1,2.3,,4";)：
1. public string[] Split(params char[] separator)

程序代碼

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)

程序代碼

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)

程序代碼

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)

程序代碼

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)

程序代碼

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)

程序代碼

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