/*
C#: The Complete Reference
by Herbert Schildt
Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/
// Delegates can refer to instance methods, too.
using System;
// Declare a delegate.
delegate string strMod(string str);
class StringOps {
// Replaces spaces with hyphens.
public string replaceSpaces(string a) {
Console.WriteLine("Replaces spaces with hyphens.");
return a.Replace(' ', '-');
}
// Remove spaces.
public string removeSpaces(string a) {
string temp = "";
int i;
Console.WriteLine("Removing spaces.");
for(i=0; i < a.Length; i++)
if(a[i] != ' ') temp += a[i];
return temp;
}
// Reverse a string.
public string reverse(string a) {
string temp = "";
int i, j;
Console.WriteLine("Reversing string.");
for(j=0, i=a.Length-1; i >= 0; i--, j++)
temp += a[i];
return temp;
}
}
public class DelegateTest1 {
public static void Main() {
StringOps so = new StringOps(); // create an instance of StringOps
// Construct a delegate.
strMod strOp = new strMod(so.replaceSpaces);
string str;
// Call methods through delegates.
str = strOp("This is a test.");
Console.WriteLine("Resulting string: " + str);
Console.WriteLine();
strOp = new strMod(so.removeSpaces);
str = strOp("This is a test.");
Console.WriteLine("Resulting string: " + str);
Console.WriteLine();
strOp = new strMod(so.reverse);
str = strOp("This is a test.");
Console.WriteLine("Resulting string: " + str);
}
}
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