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String.Split 方法有6個重載函數(shù)：

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么使用(以下string words = "1,2.3,,4";)：

1. public string[] Split(params char[] separator)

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)

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)

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)

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)

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)

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

需要注意的是沒有重載函數(shù)public string[] Split(string[] separator)，所以我們不能像VB.NET那樣使用words.Split(",")，而只能使用words.Split(＇,＇)！很多人都很奇怪為什么把雙引號改為單引號就可以了？看了上邊的重載函數(shù)該知道答案了吧^_^