Can anyone tell me what is best place to use deleagate in c#??

Can anyone tell me what is best place to use deleagate in c#??

Thanks

jegan

http://msdn.microsoft.com/en-us/library/ms173173(VS.80).aspx

Use a delegate when:

• An eventing design pattern is used.

• It is desirable to encapsulate a static method.

• The caller has no need access other properties, methods, or interfaces on the object implementing the method.

• Easy composition is desired.

• A class may need more than one implementation of the method.

Another interesting post - http://blog.decayingcode.com/2009/02/when-would-you-use-delegates-in-c.html

When would you use deligates - http://stackoverflow.com/questions/191153/when-would-you-use-delegates-in-c

Where do I use deligates - http://stackoverflow.com/questions/31497/where-do-i-use-delegates

 can use it as a call back method and it should be type safe we can use delegage.It act as a function pointers in .NET.

Read the Chapter 17 of Applied Microsoft .NET Framework Programming by Jeffrey Richter.You will get the good idea about delegate

Some more links for your reference

http://www.akadia.com/services/dotnet_delegates_and_events.html
http://www.codersource.net/csharp_delegates_events.html
http://www.codeproject.com/useritems/Delegates_in_C_.asp
http://www.eggheadcafe.com/articles/20040429.asp
http://www.programmersheaven.com/articles/faisal/delegates.htm
http://www.c-sharpcorner.com/UploadFile/arulchinnappan/Delegate_109152005080029AM/Delegate_1.aspx?ArticleID=42f8981b-72d2-441f-a95f-48dcbb93dbf5
http://www.c-sharpcorner.com/UploadFile/tavanover/ImplementingDelegatesinCS212032005020758AM/ImplementingDelegatesinCS2.aspx?ArticleID=c0af8df4-eaf-4f4b-960d-0d9a55c3807e
http://www.ondotnet.com/pub/a/dotnet/2002/11/04/delegates.htm
http://www.akadia.com/services/dotnet_delegates_and_events.html

Delegates are function pointers in C# that are managed and type safe and can refer to one or more methods that have identical signatures. Delegates in C# are reference types. They are type safe, managed function pointers in C# that can be used to invoke a method that the delegate refers to. The signature of the delegate should be the same as the signature of the method to which it refers. According to MSDN, "A delegate in C# is similar to a function pointer in C or C++. Using a delegate allows the programmer to encapsulate a reference to a method inside a delegate object. The delegate object can then be passed to code which can call the referenced method, without having to know at compile time which method will be invoked. Unlike function pointers in C or C++, delegates are object-oriented, type-safe, and secure."

http://www.exforsys.com/tutorials/csharp/delegates-in-csharp.html

http://www.codedigest.com/Articles/CSHARP/5_Delegates_and_Anonymous_methods_in_C_.aspx

Thanks&Regards,

Sreenath.T

Hi all ,

 When i saw the question , it reminded me of a sort program which i wrote to demonstrate the use of Delegates. Without much explanation (as the usage of delegate is obvious in this example ) i am pasting the code here

<CODE>

using System;

namespace test
{
        public delegate int Comparer( Object a , Object b );

       class Sorter
    {
            public static void Sort( Object [] s,Comparer comp )
            {
              int nlen = s.Length;
          int i=0,j=0;
              for( i=0; i < nlen; ++i )
        {
                   for( j=0; j < nlen; ++j )
                   
                   {
                        if ( comp(s,s[j]) < 0 )
            {
                           Object t = s[j];
               s[j] = s;
                           s = t;   

                        } 
                     
           }
                }     
            }

        public static int StringComparer( Object a , Object b )
        {
           String tas =(String)a;
           String tbs = (String)b;

           return  String.Compare(tas,tbs);
               
         

        }

        public static int intComparer( Object a , Object b )
        {
           int tas =(int)a;
           int tbs = (int)b;

           if ( tas < tbs )
                return -1;
           else if ( tas > tbs )
                return 1;
           else { return 0; }
               
         

        }

        public static void Main()
    {
          
           String  [] x = { "A","Z","C"};
           Comparer t = new Comparer(StringComparer);
           Sort(x,t);
           foreach( String  a in x )
            {
                Console.WriteLine(a);
           }

           Object  [] x2 = { 20,10,5,80,30};
           Comparer t2 = new Comparer(intComparer);
           Sort(x2,t2);
           foreach( int   ba in x2 )
            {
                Console.WriteLine(ba);
           }

    }


    }



}

</CODE>

Copy the contents of the <CODE> </CODE> block into a file ( say sort2.cs )

Go to the visual studio command prompt

csc sort2.cs

sort2

Regards

Praseed Pai

http://praseedp.blogspot.com