C#中字符,字符串的大小写转换

字符串

对字符串来说,"string".ToLower()和"string".ToUpper()可以基本满足需求,但是当需要将首字母大写的时候,这两个函数就有点不够用了.但还好,我们还有TextInfo类下的ToLittleCase方法.在使用TextInfo类时,必须指定区域性.要获得区域性,必须能够访问当前线程,从该线程中检索CurrentCulture属性.

using System;
using System.Globalization;
using System.Threading;

namespace csConsole
{

    public class MyClass 
    {
        public static void Main() 
	{ 
	  string title="this is my converted string";
          Console.WriteLine("String Class");
          Console.WriteLine("------------");
			
          //Convert string to uppercase.
          Console.WriteLine(title.ToUpper());
          //Convert string to lowercase.
          Console.WriteLine(title.ToLower());
	
          Console.WriteLine();
          Console.WriteLine("TextInfo Class");
          Console.WriteLine("--------------");

          //Get the culture property of the thread.
          CultureInfo cultureInfo   = Thread.CurrentThread.CurrentCulture;
          //Create TextInfo object.
          TextInfo textInfo = cultureInfo.TextInfo;
                    
          //Convert to uppercase.
          Console.WriteLine(textInfo.ToUpper(title));
          //Convert to lowercase.
          Console.WriteLine(textInfo.ToLower(title));
          //Convert to title case.
          Console.WriteLine(textInfo.ToTitleCase(title));
	}
    }
}

字符

对字符来说,最初将一个字符变为小写,我是这样做的  char itemLower = Convert.ToChar(item.ToString().ToLower())  ,很傻很天真的方法.后来,我才查到char有静态方法ToUpper,ToLowwer,所以可以这样做.

                char itemLower = char.ToLower(item);
                char itemUpper = char.ToUpper(item);