感谢：博主
http://www.cnblogs.com/yugen/archive/2010/08/18/1802781.html
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：aaabbbccc 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：aaabbbcccdddeee 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：aaabbbccc
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(','）