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  • Split函数

    描述:返回一个下标从0开始的一维数组,它包含指定数目的子字符串

    实例:

       1.用单个字符分隔

        string str1 = "1,2,3";

        string [] str = str1.split(',');  //得到:{"1","2","3"}

        foreach(string s in str){

          Response.Write( s+"<br/>");

        }

        输出结果://1

                      //2

                      //3

         2.用多个字符分隔

          string str1 = "1,2,3.4"

          string str2 = str1.split(new char[2]{',','.'});

          foreach(string s in str2){

           Response.Write(s+"<br/>");

          }

           输出结果://1

                         //2

              //3

            //4

         3.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:
         aaa
         bbb
         ccc

    总结提高:

     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:以下string str= "1,2.3,,4";

    •  public string[] Split(params char[] separator)

             string[] split = str.Split(new Char[] { ',' });//返回:{"1","2.3","","4"}
             string[] split = str.Split(new Char[] { ',', '.' });//返回:{"1","2","3","","4"} 

    •  public string[] Split(char[] separator, int count)

         string[] split = str.Split(new Char[] { ',', '.' }, 2);//返回:{"1","2.3,,4"}
             string[] split = str.Split(new Char[] { ',', '.' }, 6);//返回:{"1","2","3","","4"} 

    •  public string[] Split(char[] separator, StringSplitOptions options)

             string[] split = str.Split(new Char[] { ',', '.' }, StringSplitOptions.RemoveEmptyEntries);//返回:{"1","2","3","4"} 不保留空元素
             string[] split = str.Split(new Char[] { ',', '.' }, StringSplitOptions.None);//返回:{"1","2","3","","4"} 保留空元素 

    •  public string[] Split(string[] separator, StringSplitOptions options)

             string[] split = str.Split(new string[] { ",", "." }, StringSplitOptions.RemoveEmptyEntries);//返回:{"1","2","3","4"} 不保留空元素
             string[] split = str.Split(new string[] { ",", "." }, StringSplitOptions.None);//返回:{"1","2","3","","4"} 保留空元素 

    •  public string[] Split(char[] separator, int count, StringSplitOptions options)

             string[] split = str.Split(new Char[] { ',', '.' }, 2, StringSplitOptions.RemoveEmptyEntries);//返回:{"1","2.3,,4"} 不保留空元素
             string[] split = str.Split(new Char[] { ',', '.' }, 6, StringSplitOptions.None);//返回:{"1","2","3","","4"} 保留空元素 

    •  public string[] Split(string[] separator, int count, StringSplitOptions options)

             string[] split = str.Split(new string[] { ",", "." }, 2, StringSplitOptions.RemoveEmptyEntries);//返回:{"1","2.3,,4"} 不保留空元素
             string[] split = str.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(',')
     
     
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  • 原文地址:https://www.cnblogs.com/llljpf/p/6619010.html
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