C#中Split用法~

Posted 2020-08-20 Twang

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(\',\'）

转：不远道人的专栏     C#中Split用法~