[C#] 資料結構與影像處理

2010-11-25 13:36:40Chris C.S Huang

[C#] 字串處理

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1. 字串格式-Format

using  System;       
class  MainClass  {       
    public  static  void  Main()  {   
        double  v  =  17688.65849;   
        double  v2  =  0.15;   
        int  x  =  21;    
        string  str  =  String.Format("{0:F2}",  v);//浮點數       
        Console.WriteLine(str);       
        str  =  String.Format("{0:N5}",  v);     //數字    
        Console.WriteLine(str);              
        str  =  String.Format("{0:e}",  v); 　　　//科學記號    　　　  
        Console.WriteLine(str);       
        str  =  String.Format("{0:r}",  v);       
        Console.WriteLine(str);              
        str  =  String.Format("{0:p}",  v2);  　　//百分比     
        Console.WriteLine(str);       
        str  =  String.Format("{0:X}",  x);       //十六進位      
        Console.WriteLine(str);       
        str  =  String.Format("{0:D12}",  x);   　//十進位
        Console.WriteLine(str);         
        str  =  String.Format("{0:C}",  189.99);  //貨幣  
        Console.WriteLine(str);   
    }   
}

17688.66

17,688.65849

1.768866 e+004

17688.65849

15.00%

000000000021

NT$189.99

2. 清除字串 - Empth

using System;

namespace ConsoleApplication1

    class Program

      static void Main (string[] args)

        string name = "Chris Huang";

        Console.WriteLine("Name = {0}", name);

        name = String.Empty;

        Console.WriteLine("Name = {0}", name);

        Console.Read();

輸出結果:

Name = Chris Huang

Name =

3. 字串長度 Length

using System;

namespace Prog06_06
{
 class MainProg
 {
  static void Main(string[] args)
  {
   string  str = "Chris Huang";
   int     stringLen = 0;

   Console.WriteLine("String  = {0}", str);
   stringLen = str.Length;
   Console.WriteLine("String Length = {0}",stringLen);
   Console.WriteLine();
   Console.WriteLine("Press Enter key to Exit!!");
   Console.Read();
  }
 }
}

輸出結果
String = Chris Huang
String Length = 11
Press Enter key to Exit!!
 
4. 字串分割-Split
using System;
class Program{    
   static void Main()    
     {        
        string FileName = "tree.jpg";               
        string[] words = FileName.Split('.');        
        foreach (string word in words)        
           {            
             Console.WriteLine(word);        
           }    
     }
}
 
輸出結果
tree
jpg
 
 
5. 字串陣列宣告 - string[]  
string[] color =  new string[2] {"Black", "White"};
 
 
6. 子字串 - Substring
 
語法:string string.Substring(int StartIndex, int Length);   
   static void Main(string[] args)
   {
            string str = "Collections";
            string substr = str.Substring(str.Length - 6, 6);
            Console.WriteLine(substr);
            Console.Read();
   }
   
輸出結果:
Substring = ctions
參考資料:
http://www.navioo.com/csharp/examples/String_113.dhtml