Imports System

Public Class SamplesDelegate

   ' Declares a delegate for a method that takes in an int and returns a String.
   Delegate Function myMethodDelegate(myInt As Integer) As [String]

   ' Defines some methods to which the delegate can point.
   Public Class mySampleClass

      ' Defines an instance method.
      Public Function myStringMethod(myInt As Integer) As [String]
         If myInt > 0 Then
            Return "positive"
         End If
         If myInt < 0 Then
            Return "negative"
         End If
         Return "zero"
      End Function 'myStringMethod

      ' Defines a static method.
      Public Shared Function mySignMethod(myInt As Integer) As [String]
         If myInt > 0 Then
            Return "+"
         End If
         If myInt < 0 Then
            Return "-"
         End If
         Return ""
      End Function 'mySignMethod
   End Class 'mySampleClass

   Public Shared Sub Main()

      ' Creates one delegate for each method. For the instance method, an
      ' instance (mySC) must be supplied. For the Shared method, the
      ' method name is qualified by the class name.
      Dim mySC As New mySampleClass()
      Dim myD1 As New myMethodDelegate(AddressOf mySC.myStringMethod)
      Dim myD2 As New myMethodDelegate(AddressOf mySampleClass.mySignMethod)

      ' Invokes the delegates.
      Console.WriteLine("{0} is {1}; use the sign ""{2}"".", 5, myD1(5), myD2(5))
      Console.WriteLine("{0} is {1}; use the sign ""{2}"".", - 3, myD1(- 3), myD2(- 3))
      Console.WriteLine("{0} is {1}; use the sign ""{2}"".", 0, myD1(0), myD2(0))

   End Sub 'Main

End Class 'SamplesDelegate 


'This code produces the following output:
' 
'5 is positive; use the sign "+".
'-3 is negative; use the sign "-".
'0 is zero; use the sign "".

using System;
public class SamplesDelegate  {

   // Declares a delegate for a method that takes in an int and returns a String.
   public delegate String myMethodDelegate( int myInt );

   // Defines some methods to which the delegate can point.
   public class mySampleClass  {

      // Defines an instance method.
      public String myStringMethod ( int myInt )  {
         if ( myInt > 0 )
            return( "positive" );
         if ( myInt < 0 )
            return( "negative" );
         return ( "zero" );
      }

      // Defines a static method.
      public static String mySignMethod ( int myInt )  {
         if ( myInt > 0 )
            return( "+" );
         if ( myInt < 0 )
            return( "-" );
         return ( "" );
      }
   }

   public static void Main()  {

      // Creates one delegate for each method. For the instance method, an
      // instance (mySC) must be supplied. For the static method, use the
      // class name.
      mySampleClass mySC = new mySampleClass();
      myMethodDelegate myD1 = new myMethodDelegate( mySC.myStringMethod );
      myMethodDelegate myD2 = new myMethodDelegate( mySampleClass.mySignMethod );

      // Invokes the delegates.
      Console.WriteLine( "{0} is {1}; use the sign \"{2}\".", 5, myD1( 5 ), myD2( 5 ) );
      Console.WriteLine( "{0} is {1}; use the sign \"{2}\".", -3, myD1( -3 ), myD2( -3 ) );
      Console.WriteLine( "{0} is {1}; use the sign \"{2}\".", 0, myD1( 0 ), myD2( 0 ) );
   }

}


/*
This code produces the following output:

5 is positive; use the sign "+".
-3 is negative; use the sign "-".
0 is zero; use the sign "".
*/ 

using namespace System;
delegate String^ myMethodDelegate( // Declares a delegate for a method that takes in an int and returns a String.
int myInt );

// Defines some methods to which the delegate can point.
ref class mySampleClass
{
public:

   // Defines an instance method.
   String^ myStringMethod( int myInt )
   {
      if ( myInt > 0 )
            return ("positive");

      if ( myInt < 0 )
            return ("negative");

      return ("zero");
   }


   // Defines a static method.
   static String^ mySignMethod( int myInt )
   {
      if ( myInt > 0 )
            return ("+");

      if ( myInt < 0 )
            return ("-");

      return ("");
   }

};

int main()
{

   // Creates one delegate for each method. For the instance method, an 
   // instance (mySC) must be supplied. For the static method, only the
   // method name is needed.
   mySampleClass^ mySC = gcnew mySampleClass;
   myMethodDelegate^ myD1 = gcnew myMethodDelegate( mySC, &mySampleClass::myStringMethod );
   myMethodDelegate^ myD2 = gcnew myMethodDelegate( mySampleClass::mySignMethod );

   // Invokes the delegates.
   Console::WriteLine( "{0} is {1}; use the sign \"{2}\".", 5, myD1( 5 ), myD2( 5 ) );
   Console::WriteLine( "{0} is {1}; use the sign \"{2}\".",  -3, myD1(  -3 ), myD2(  -3 ) );
   Console::WriteLine( "{0} is {1}; use the sign \"{2}\".", 0, myD1( 0 ), myD2( 0 ) );
}

/*
This code produces the following output:

5 is positive; use the sign "+".
-3 is negative; use the sign "-".
0 is zero; use the sign "".
*/

import System.*;

public class SamplesDelegate
{
    /** @delegate 
     */
    // Declares a delegate for a method that takes in an int and returns
    // a String.
    public delegate String MyMethodDelegate(int myInt);

    // Defines some methods to which the delegate can point.
    public static class MySampleClass
    {
        // Defines an instance method.
        public String MyStringMethod(int myInt)
        {
            if (myInt > 0)  {
                return "positive";
            }
            if (myInt < 0) {
                return "negative";
            }
            return "zero";
        } //myStringMethod

        // Defines a static method.
        public static String MySignMethod(int myInt)
        {
            if (myInt > 0) {
                return "+";
            }
            if (myInt < 0) {
                return "-";
            }
            return "";
        } //MySignMethod
    } //MySampleClass

    public static void main(String[] args)
    {
        // Creates one delegate for each method. For the instance method,
        // an instance (mySC) must be supplied. For the static method,
        // only the class name is required.
        MySampleClass mySC = new MySampleClass();
        MyMethodDelegate myD1 = new MyMethodDelegate(mySC.MyStringMethod);
        MyMethodDelegate myD2 = new MyMethodDelegate(MySampleClass.MySignMethod);

        // Invokes the delegates.
        Console.WriteLine("{0} is {1}; use the sign \"{2}\".", 
            (Int32)(5), System.Convert.ToString(myD1.Invoke(5)), 
            System.Convert.ToString(myD2.Invoke(5)));
        Console.WriteLine("{0} is {1}; use the sign \"{2}\".",
            System.Convert.ToString(-3), System.Convert.ToString(myD1.Invoke(-3)),
            System.Convert.ToString(myD2.Invoke(-3)));
        Console.WriteLine("{0} is {1}; use the sign \"{2}\".", (Int32)(0),
            System.Convert.ToString(myD1.Invoke(0)), System.Convert.ToString(
            myD2.Invoke(0)));
    } //main
} //SamplesDelegate 

/*
This code produces the following output:

5 is positive; use the sign "+".
-3 is negative; use the sign "-".
0 is zero; use the sign "".
*/