Why delegate method shows no input value?

Question

I'm trying to understand why this delegate method has no value in the output. I thought it had to be: Value is - 5 Value is - 5

But the result is: Value is - Value is -

Why number "5" is absent is this example?

    class Program
{
    internal delegate void Feedback(Int32 value);
    static void Main(string[] args)
    {
        Feedback fbChain = null;
        Feedback delFeedback = new Feedback(Print);

        fbChain += delFeedback;
        fbChain += delFeedback;

        fbChain.Invoke(5);
    }

    internal static void Print(Int32 value)
    {
        Console.WriteLine("Value is - ", value);
    }       
}

adv12 · Accepted Answer · 2015-01-16 15:37:09Z

2

Try this:

internal static void Print(Int32 value)
{
    Console.WriteLine("Value is - {0}", value);
}

(You left out the {0}, which is what tells Console.WriteLine to insert the second parameter into the output.)

answered Jan 16, 2015 at 15:37

adv12

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Comments

Tal · Accepted Answer · 2015-01-16 15:41:26Z

0

you can try these:

    internal static void Print(Int32 value)
{
    Console.WriteLine("Value is - " + value);
}

or

internal static void Print(Int32 value)
{

    Console.WriteLine(string.Format("Value is - {0}", value));
}

answered Jan 16, 2015 at 15:41

Tal

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