[C#] Adding Event Listener to static void Main() fails, why?
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Thread: [C#] Adding Event Listener to static void Main() fails, why?

  1. #1
    Join Date
    Sep 2012
    Posts
    2

    [C#] Adding Event Listener to static void Main() fails, why?

    Hi All,

    Trying to download some strings from a webpage, then fires an event for each download that completes. However, when trying to add the event listener, the program throws the following error:

    An object reference is required for the non-static field, method, or property 'Test.Program.client_OpenReadCompleted(object, System.Net.OpenReadCompletedEventArgs)'

    Code is here: http://codepad.org/mAZVd4DJ

    The line with the error is line 22.

    How can I get around this?

    Please let me know if you require more information, thanks!

  2. #2
    Arjay's Avatar
    Arjay is offline Moderator / MS MVP Power Poster
    Join Date
    Aug 2004
    Posts
    11,370

    Re: [C#] Adding Event Listener to static void Main() fails, why?

    Just pull the work into a non-static method.

    Code:
    class Program
    {
            static void Main( string [ ] args )
            {
                var program = new Program();
    
                program.ProcessConnections( );
            }
    
            public void ProcessConnections()
            {
                List<string> dataList = new List<string>( );
    
                for ( int index = 0; index < 5; index++ )
                {
                    try
                    {
                        WebClient client = new WebClient( );
                        client.OpenReadCompleted += Client_OpenReadCompleted;
                        Stream stream = client.OpenRead( new Uri( "http://graph.facebook.com/347971448616743/photos?limit=30&offset=" + index * 10 ) );
    
                        StreamReader streamReader = new StreamReader( stream );
                        dataList.Add( streamReader.ReadToEnd( ) );
                    }
                    catch ( WebException webException )
                    {
                        Console.WriteLine( webException.Message );
                    }
                }
    
                Console.WriteLine( "Finished downloading, showing results..." );
    
                foreach ( string data in dataList )
                {
                    Console.WriteLine( data.Substring( 0, 50 ) );
                }
    
                Console.ReadLine( );
    
    
            }
    
            public void Client_OpenReadCompleted( object sender, OpenReadCompletedEventArgs e )
            {
                Console.WriteLine( "Finished a download" );        }
    }

  3. #3
    Join Date
    Sep 2012
    Posts
    2

    Re: [C#] Adding Event Listener to static void Main() fails, why?

    Perfect, thank you very much!

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