C# string 的 Split

C# 中 string 的 Split 方法將字符串分隔後返回字符串數組；

 

Split 有六個重載函數，大概有兩類：一類的 separator 爲 char[]；另一類爲 string[]。我們以 string[] 爲例講述它的兩個重載函數。

String.Split(string[] separator, StringSplitOptions options);
String.Split(string[] separator, int count, StringSplitOptions options);

• separator 爲分隔字符串的字符串數組，由於是數組，可以同時使用多個“分隔符”了。
• options 有兩個值可選：StringSplitOptions.None 分隔後遇到的空字符串要作爲數組元素的一項返回；StringSplitOptions.RemoveEmptyEntries 分隔後遇到的空字符串不作爲數組元素的一項返回。
• count 分隔後返回的數組的最大長度。

 

String.Split 方法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麼使用(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
G e+K0M/Te0IZ0string[] 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