C#中split的用法

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>");
輸出結(jié)果：
aaa
bbb
ccc
2、用多個(gè)字符來分隔：
string?str="aaajbbbscccjdddseee";?

string[]?sArray=str.Split(new?char[2]?{'j','s'});?
foreach(string?i?in?sArray)?Response.Write(i.ToString()?+?"<br>");?
輸出結(jié)果：
aaa
bbb
ccc
ddd
eee
3、用單個(gè)字符來分隔：
string?str="aaajbbbjccc";
string[]?sArray=str.Split('j');
foreach(string?i?in?sArray)?Response.Write(i.ToString()?+?"<br>");
輸出結(jié)果：
aaa
bbb
ccc

?

?

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

這是一個(gè)具有語法錯(cuò)誤的語句，Split 的 separator 參數(shù)應(yīng)該是?char[] 或 string[]，不應(yīng)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(gè)重載函數(shù)：

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(shí)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

需要注意的是沒有重載函數(shù)public string[] Split(string[] separator)，所以我們不能像VB.NET那樣使用words.Split(",")，而只能使用words.Split(','）

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