C# 中split的用法

1、用字符串分隔，使用到了Regex类的split静态方法

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;

namespace CSharpTest
{
    class Program
    {
        static void Main(string[] args)
        {
            string str = "aaaspbbbspccc";
            string[] sArray = Regex.Split(str, "sp", RegexOptions.IgnoreCase);
            foreach (string i in sArray) Console.Write(i + "\n");
            Console.ReadKey();

        }
    }
}

输出结果为：

aaa

bbb

ccc

 

2.用多个字符来分隔：(只有遇到字符数组中的一个字符，就会作为分隔符)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace CSharpTest
{
    class Program
    {
        static void Main(string[] args)
        {
            string str = "aaasbbbjcccjdddseee";
            string[] sArray = str.Split(new char[2] { 'j', 's' });
            foreach (string i in sArray) Console.Write(i.ToString() + "\n");
            Console.ReadKey();
        }
    }
}

输出结果：

aaa

bbb

ccc

ddd

eee

3.用单个字符来分隔：

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace CSharpTest
{
    class Program
    {
        static void Main(string[] args)
        {
            string str = "aaajbbbjccc";
            string[] sArray = str.Split('j');
            foreach (string i in sArray) Console.Write(i.ToString() + "\n");
            Console.ReadKey();
        }
    }
}

输出结果：

aaa

bbb

ccc

 

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) ITPUB个人空间,n:H!C0M/S3U\u0002P

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
\u0002w1I+Ch%^\u0017}0string[] 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 ITPUB个人空间1K;e\u0007f\u0008f }\u0011C n
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(','）