字符串是通过Split方法来实现。有多种重载形式。
   格式：字符串1.Split(字符或字符数组)，分割后返回值是一个字符串数组。
   string mystr = "str1-str2-str3=str4";
   string[] spstr = mystr.Split('-');//分割字符
   foreach(string outstr in spstr)
   {
      Console.WriteLine(outstr);
   }
   string[] spstr=mystr.Split(new char[]{'-','='});//分割字符数组
   foreach (string outstr in spstr)
   {
       Console.WriteLine(outstr);
   }
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

(我们定义一个 字符串 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

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[C#之利用Split分割字符串]

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