Question

I’m making a console application that must call a certain method in timed intervals.

I’ve searched for that and found that the System.Threading.Timer class can achieve such a functionality, but I’m not quite following how to implement it.

I tried this:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Threading;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Timer x = new Timer(test, null, 0, 1000);
            Console.ReadLine();
        }

        public static void test()
        {
            Console.WriteLine("test");
        }
    }
}

But I get an error on the Timer x = new Timer(test, null, 0, 1000); line that says:

The best overloaded method match for System.Threading.Timer.Timer(System.Threading.TimerCallback, object, int, int)’ has some invalid arguments

I really don’t know how to make this work properly, but if anyone has a link or something that can explain timers for a beginner, I’d be grateful.

Answer 1

The problem is that the signature of your test() method:

public static void test()

doesn’t match the required signature for TimerCallback:

public delegate void TimerCallback(
    Object state
)

That means you can’t create a TimerCallback directly from the test method. The simplest thing to do is to change the signature of your test method:

public static void test(Object state)

Or you could use a lambda expression in your constructor call:

Timer x = new Timer(state => test(), null, 0, 1000);

Note that to follow .NET naming conventions, your method name should start with a capital letter, e.g. Test rather than test.