ex-10-01

Programming Csharp Source Code(代码) Programming Csharp Source Code

// Example 10-01: Working with strings

namespace Programming_CSharp
{
   using System;

   public class StringTester
   {
      static void Main()
      {
         // create some strings to work with
         string s1 = "abcd";
         string s2 = "ABCD";
         string s3 = @"Liberty Associates, Inc. 
                provides custom .NET development, 
                on-site Training and Consulting";
    
         int result;  // hold the results of comparisons

         // compare two strings, case sensitive
         result = string.Compare(s1, s2);
         Console.WriteLine(
            "comprecompare s1: {0}, s2: {1}, result: {2}\n", 
            s1, s2, result);            

         // overloaded compare, takes boolean "ignore case" 
         //(true = ignore case)
         result = string.Compare(s1,s2, true);
         Console.WriteLine("compare insensitive\n");
         Console.WriteLine("s4: {0}, s2: {1}, result: {2}\n", 
            s1, s2, result);            

         // concatenation method
         string s6 = string.Concat(s1,s2);
         Console.WriteLine(
            "s6 concatenated from s1 and s2: {0}", s6);

         // use the overloaded operator
         string s7 = s1 + s2;
         Console.WriteLine(
            "s7 concatenated from s1 + s2: {0}", s7);

         // the string copy method
         string s8 = string.Copy(s7);
         Console.WriteLine(
            "s8 copied from s7: {0}", s8);

         // use the overloaded operator
         string s9 = s8;
         Console.WriteLine("s9 = s8: {0}", s9);

         // three ways to compare. 
         Console.WriteLine(
            "\nDoes s9.Equals(s8)?: {0}", 
            s9.Equals(s8));
         Console.WriteLine(   
            "Does Equals(s9,s8)?: {0}", 
            string.Equals(s9,s8));
         Console.WriteLine(
            "Does s9==s8?: {0}", s9 == s8);

         // Two useful properties: the index and the length
         Console.WriteLine(
            "\nString s9 is {0} characters long. ", 
            s9.Length);
         Console.WriteLine(
            "The 5th character is {1}\n", 
            s9.Length, s9[4]);

         // test whether a string ends with a set of characters
         Console.WriteLine("s3:{0}\nEnds with Training?: {1}\n",
            s3, 
            s3.EndsWith("Training") );
         Console.WriteLine(
            "Ends with Consulting?: {0}",
            s3.EndsWith("Consulting"));

         // return the index of the substring
         Console.WriteLine(
            "\nThe first occurrence of Training ");
         Console.WriteLine ("in s3 is {0}\n", 
            s3.IndexOf("Training"));

         // insert the word excellent before "training"
         string s10 = s3.Insert(103,"excellent ");
         Console.WriteLine("s10: {0}\n",s10);

         // you can combine the two as follows:
         string s11 = s3.Insert(s3.IndexOf("Training"),
            "excellent ");
         Console.WriteLine("s11: {0}\n",s11);
      }
   }
}