class1.cs

C#2005 实例源代码

using System;

namespace Example_String
{
	/// <summary>
	/// Class1 的摘要说明。
	/// </summary>
	class MainTest
	{
		public void test()
		{
			//定义两个String对象，并对其赋值
			System.String strA="Hello";
			System.String strB="World";
			String newStr="";
			
			///字符串比较
			Console.WriteLine("----------------字符串比较----------------");
			//Compare
			Console.WriteLine(String.Compare(strA,strB));		//-1
			Console.WriteLine(String.Compare(strA,strA));		//0
			Console.WriteLine(String.Compare(strB,strA));		//1
			
			//CompareTo
			Console.WriteLine(strA.CompareTo(strB));			//-1	
		
			//Equals
			Console.WriteLine(String.Equals(strA,strB));		//false
			Console.WriteLine(strA.Equals(strB));				//false

			//==和!=
			Console.WriteLine(strA==strB);						//false
			Console.WriteLine(strA!=strB);						//false

			//定位子串和字符
			Console.WriteLine("----------------定位子串和字符----------------");
			//StartWith|EndWith
			Console.WriteLine(strA.StartsWith("He"));			//true
			Console.WriteLine(strA.StartsWith("MM"));			//false
			Console.WriteLine(strA.EndsWith("lo"));			//true
			Console.WriteLine(strA.EndsWith("MM"));			//false

			//Indexof|LastIndexOf
			Console.WriteLine(strA.IndexOf('l'));			//2
			Console.WriteLine(strA.LastIndexOf('l'));		//3

			//IndexofAny|LastIndexOfAny
			char[] anyOf={'H','e','l'};
			Console.WriteLine(strA.IndexOfAny(anyOf));			//0
			Console.WriteLine(strA.LastIndexOfAny(anyOf));		//3

			//格式化字符串
			Console.WriteLine("----------------格式化字符串----------------");
			//Format
			newStr="";
			newStr=String.Format("{0},{1}!",strA,strB);
			Console.WriteLine(newStr);		//Hello,World!
			newStr=String.Format("CurrentTime={0:yyyy-MM-dd}",System.DateTime.Now);
			Console.WriteLine(newStr);		//形如：2006-05-19

			//连接字符串
			Console.WriteLine("----------------连接字符串----------------");
			//Concat
			newStr="";
			newStr=String.Concat(strA," ",strB);
			Console.WriteLine(newStr);		//"HelloWorld"

			//Join
			newStr="";
			String[] strArr={strA,strB};
			newStr=String.Join("^^",strArr);
			Console.WriteLine(newStr);		//"Hello^^World"

			//+
			newStr="";
			newStr=strA+strB;
			Console.WriteLine(newStr);		//"HelloWorld"

			//分裂字符串
			Console.WriteLine("----------------分裂字符串----------------");
			//Split
			newStr="Hello^^World";
			char[] separator={'^'};
			String[] splitStrings=new String[100];
			splitStrings=newStr.Split(separator);
			int i=0;
			while(i<splitStrings.Length)
			{
				Console.WriteLine("item{0}:{1}",i,splitStrings[i]);		
				i++;
			}

			//插入操作
			Console.WriteLine("----------------插入操作----------------");
			//Insert
			newStr="";
			newStr=strA.Insert(1,strB);
			Console.WriteLine(newStr);		//"HWorldello"

			//删除操作
			Console.WriteLine("----------------删除操作----------------");
			//Remove
			newStr="";
			newStr=strA.Remove(1,3);
			Console.WriteLine(newStr);		//"Ho"

			//Trim
			newStr="";
			char[] trimChars={'@','#','$',' '};
			String strC="@Hello# $";
			newStr=strC.Trim(trimChars);
			Console.WriteLine(newStr);		//"Hello"


			//PadLeft
			newStr="";
			newStr=strA.PadLeft(20,'*');
			Console.WriteLine(newStr);		//"HWorldello"

			//复制操作
			Console.WriteLine("----------------复制操作----------------");
			//Copy
			newStr="";
			newStr=String.Copy(strA);
			Console.WriteLine(newStr);		//"Hello"

			//CopyTo
			char[] newCharArr=new char[100];
			strA.CopyTo(2,newCharArr,0,3);
			Console.WriteLine(newCharArr);		//"Hel"

			//替换操作
			Console.WriteLine("----------------替换操作----------------");
			//Replace
			newStr=strA.Replace("ll","r");			
			Console.WriteLine(newStr);		//Hero

			//大小写转换
			Console.WriteLine("----------------大小写转换----------------");
			//ToUpper|ToLower
			newStr=strA.ToUpper();			
			Console.WriteLine(newStr);		//HELLO
			newStr=strA.ToLower();
			Console.WriteLine(newStr);		//hello
		}
		/// <summary>
		/// 应用程序的主入口点。
		/// </summary>
		[STAThread]
		static void Main(string[] args)
		{
			MainTest t=new MainTest();
			t.test();
		}
	}
}