C# 将字符串进行分割

将字符串str1 = "select * from table "; 进行分割，有两种方法：

用字符分割字符串： 字符串.split();

用字符串分割字符串： ();

两者适用情况不同，详细解释如下：

1.1单个字符 作为分割，使用.split('')

string str = "select * From table";
string[] sArray = ('e');
foreach(string s in sArray)
{
    (s + "<br>");
};

结果： "s"      "l"      "ct * From tabl"     

1.2 多个字符 作为分割 ，使用.split(new char[]{''})

string str = "select * From table";
string[] sArray = (new char[2]{'e','r'});
foreach(string s in sArray)
{
    (s + "<br>");
};

结果："s"    "l"     "ct * F"     "om tabl"    

注：string[] arr = ("o"); 这是一个具有语法错误的语句，不应是字符串，应该为string[] arr = ('o');

2 字符串 作为分割

string str = "and  = 3";
string[] sArray = (str, @"and");
foreach(string s in sArray)
{
    (s + "<br>");
};

结果： "  = 3"

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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 = (new Char[] { ',' });//返回:{"1","2.3","","4"}

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

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

程序代码

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

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

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

程序代码

string[] split = (new Char[] { ',', '.' }, );//返回:{"1","2","3","4"} 不保留空元素

string[] split = (new Char[] { ',', '.' }, );//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 = (new string[] { ",", "." }, );//返回:{"1","2","3","4"} 不保留空元素

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

string[] split = (new Char[] { ',', '.' }, 6, );//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 = (new string[] { ",", "." }, 2, );//返回:{"1","2.3,,4"} 不保留空元素

string[] split = (new string[] { ",", "." }, 6, );//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)，所以我们不能像那样使用(",")，而只能使用(','）

*6个重载函数详解内容来自于网页：/fire-dragon/p/