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String.Substring 方法

名稱(chēng) 說(shuō)明
String.Substring (Int32)         從此實(shí)例檢索子字符串。子字符串從指定的字符位置開(kāi)始。
String.Substring (Int32, Int32) 從此實(shí)例檢索子字符串。子字符串從指定的字符位置開(kāi)始且具有指定的長(cháng)度。

舉例如下：

using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string s = "Hello C# World!";
            //s1為從s中截取的位置為3的字符以后的字符子串,3表示子字符串的起始字符位置
            string s1=s.Substring(3);
            Console.WriteLine(s1);
            //s2為從s中截取的位置為6的字符開(kāi)始長(cháng)度為2的字符串，6表示子字符的起始字符位置，2表示子字符長(cháng)度
            string s2 = s.Substring(6, 2);
            Console.WriteLine(s2);
        }
    }
}
結果如下：

lo C# World!

C#

隨即在附上一個(gè)C#截取字符串函數

public string getString(string RawString, Int32 Length)
     {
         if (RawString.Length <= Length)
         {
             return RawString;
         }
         else
         {
             for (Int32 i = RawString.Length - 1; i >= 0; i--)
             {
                 if (System.Text.Encoding.GetEncoding("GB2312").GetByteCount(RawString.Substring(0, i)) < Length)
                 {
                     return RawString.Substring(0, i) + "...";
                 }
             }
             return "...";
         }
     }

1/**//// <summary>
2        /// 截取字符串，不限制字符串長(cháng)度
3        /// </summary>
4        /// <param name="str">待截取的字符串</param>
5        /// <param name="len">每行的長(cháng)度，多于這個(gè)長(cháng)度自動(dòng)換行</param>
6        /// <returns></returns>
7        public string CutStr(string str,int len)
8        {    string s="";
9            
10            for(int i=0;i<str.Length ;i++)
11            {
12                int r= i% len;
13                int last =(str.Length/len)*len;
14                if (i!=0 && i<=last)
15                {
16                    
17                    if( r==0)
18                    {
19                        s+=str.Substring(i-len,len)+"<br>";
20                    }
21                        
22                }
23                else if (i>last)
24                {
25                    s+=str.Substring(i-1) ;
26                    break;
27                }
28                
29            }
30            
31            return s;
32            
33        }
34
35
36        /**//// <summary>
37        /// 截取字符串并限制字符串長(cháng)度，多于給定的長(cháng)度＋。。。
38        /// </summary>
39        /// <param name="str">待截取的字符串</param>
40        /// <param name="len">每行的長(cháng)度，多于這個(gè)長(cháng)度自動(dòng)換行</param>
41        /// <param name="max">輸出字符串最大的長(cháng)度</param>
42        /// <returns></returns>
43        public string CutStr(string str,int len,int max)
44        {
45            string s="";
46            string sheng="";
47            if (str.Length >max)
48            {
49                str=str.Substring(0,max) ;
50                sheng="";
51            }
52            for(int i=0;i<str.Length ;i++)
53            {
54                int r= i% len;
55                int last =(str.Length/len)*len;
56                if (i!=0 && i<=last)
57                {
58                    
59                    if( r==0)
60                    {
61                        s+=str.Substring(i-len,len)+"<br>";
62                    }
63                        
64                }
65                else if (i>last)
66                {
67                    s+=str.Substring(i-1) ;
68                    break;
69                }
70                
71            }
72            
73            return s+sheng;
74            
75        }