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how-to-implement-timer-netcoreapp1-0-netcoreapp1-1.html
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<!DOCTYPE html>
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<title>How to implement a timer with .NETCoreApp1.0 or .NETCoreApp1.1</title>
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<h2>Blog</h2>
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<ul>
<li><a href="https://adrientorris.github.io/index.html" title="">Home</a></li>
<li>ASP.NET Core</li>
<li class="active"><a href="https://adrientorris.github.io/aspnet-core/how-to-implement-timer-netcoreapp1-0-netcoreapp1-1.html" title="How to implement a timer with .NETCoreApp1.0 or .NETCoreApp1.1">How to implement a timer with .NETCoreApp1.0 or .NETCoreApp1.1</a></li>
</ul>
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<div id="post_ctn">
<h1>How to implement a timer with .NETCoreApp1.0 or .NETCoreApp1.1</h1>
<p>For a .NET Core project, I needed to implement a timer, to execute some tasks at regular intervals.</p>
<p>Before ASP.NET core, I used to use the System.Timers dll, who provides all the things I needed to implement the timer I wanted to, who was something like that :</p>
<pre><code class="csharp">
public class Class1
{
Timer tm = null;
public Class1()
{
this.tm.Elapsed += new ElapsedEventHandler(Timer_Elapsed);
this.tm.AutoReset = true;
this.tm = new Timer(60000);
}
protected void Timer_Elapsed(object sender, ElapsedEventArgs e)
{
this.tm.Stop();
try
{
// My business logic here
}
catch (Exception)
{
throw;
}
finally
{
this.tm.Start();
}
}
}
</code></pre>
<p>With ASP.NET Core, you can't use System.Timers anymore, you have to use the package System.Threading.Timer, who provides almost the same things.</p>
<div class="pic_wrapper"><img src="/wwwroot/images/dotnet-core/how-to-implement-timer-netcoreapp1-0-netcoreapp1-1.png" alt="How to implement a timer with .NETCoreApp1.0 or .NETCoreApp1.1" title="How to implement a timer with .NETCoreApp1.0 or .NETCoreApp1.1" /></div>
<p>This is a quick example of a timer implemented with this package :</p>
<pre><code class="csharp">
namespace ConsoleApp
{
using System;
using System.Threading;
public class Program
{
Timer _tm = null;
AutoResetEvent _autoEvent = null;
private int _counter = 0;
public static void Main(string[] args)
{
Program p = new Program();
p.StartTimer();
}
public void StartTimer()
{
_autoEvent = new AutoResetEvent(false);
_tm = new Timer(Execute, _autoEvent, 1000, 1000);
Console.Read();
}
public void Execute(Object stateInfo)
{
if (_counter < 10)
{
Console.WriteLine("Call #" + _counter);
_counter++;
return;
}
Console.WriteLine("Final call");
_tm.Dispose();
}
}
}
</code></pre>
<p>If after adding the package System.Threading.Timer in your project, your project doesn't build anymore, it's because you have to add a depency to the Microsoft.NETCore.App platform type to your .NET Core framework :</p>
<pre><code class="json">
{
"version": "1.0.0-*",
"buildOptions": {
"emitEntryPoint": true
},
"dependencies": {
"Microsoft.NETCore.App": "1.1.0" // REMOVE THAT LINE
"System.Threading.Timer": "4.3.0"
},
"frameworks": {
"netcoreapp1.1": {
"dependencies": {
"Microsoft.NETCore.App": {
"type": "platform",
"version": "1.1.0"
}
},
"imports": "dnxcore50"
}
}
}
</code></pre>
<p>Note that if you add the dependency to the netcoreapp framework, you have to remove the first dependency line to the NET Core framework, otherwise you will have the error : <i>An item with the same key has already been added. Key: Microsoft.NETCore.App</i></p>
<div id="crdny">January 16, 2017</div>
<div id="tags_wrapper">
<ul>
<li>ASP.NET Core</li>
<li>.NETCoreApp1.0</li>
<li>.NETCoreApp1.1</li>
<li>Timer</li>
<li>System.Timers</li>
<li>System.Threading.Timer</li>
</ul>
</div>
<div id="refs_wrapper">
<ul>
<li><a href="https://msdn.microsoft.com/en-us/library/system.threading.timer(v=vs.110).aspx" title="System.Threading.Timer documentation" target="_Blank">System.Threading.Timer msdn page</a></li>
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