I need execute a function that init a timer when ArcMap application start. My extension class:

namespace GMREAddin.Modules.Toolbar
    public sealed class eManager : ESRI.ArcGIS.Desktop.AddIns.Extension
       protected override void OnStartup()
            MessageBox.Show("opened from onstartup.");

And have this attribute in the configuration enter image description here

When I run the application, it doesn't display the message, and does not start the message.

I am using version 10.4.


According to ArcMap add in constructor called not called on start up it looks like you need to add a 'delayLoad' attribute to your extension and set it to false. Then also keep autoLoad = "true".

I created an empty sample project and tested this code. The config extension looks like this and it seems to work:

    <Extension id="ArcMapAddin1_Extension1" class="Extension1" delayLoad="false" autoLoad="true" />

And then I have a MessageBox in the OnStartup() method which appears as soon as ArcStarts.

protected override void OnStartup()
  • I get the message: The 'delayLoad' attribute is not declared. And in the post isn't that attribute – Pilgrim May 5 '17 at 18:16
  • I edited my answer with the test I ran for this. What version of ArcMap are you running? The example above is 10.2. – danielm May 5 '17 at 18:29
  • I run the version 10.4 – Pilgrim May 5 '17 at 18:54
  • Okay, when using 10.4 I also see the 'attribute is not declared' error, but I can still build and run the add-in. Is it preventing you from building your add-in? – danielm May 5 '17 at 20:33
  • No, my application run. But the event doesn't work. – Pilgrim May 6 '17 at 22:24

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