C#中String.Split方法使用详解

2010-09-06 09:09:43| 分类： C# | 标签：split string char words separator |举报|字号订阅

String.Split 方法有6个重载函数：

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)

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(‘,’)！很多人都很奇怪为什么把双引号改为单引号就可以了？看了上边的重载函数该知道答案了吧^_^

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