topic Re: ArcObjects C# in ArcObjects SDK Questions

ArcObjects C#

martywalters — Fri, 17 Jul 2015 03:16:06 GMT

I'm coverting Hussein Nasser VB code to C# but I'm having problems.

it's from his session:

The Vb code works but my converted C# crashes

here is my onclick code from form1 : Form

ERROR ->

System.NullReferenceException: Object reference not set to an instance of

OCCURS during the Assignment of pMap.

private void button1_Click(object sender, EventArgs e)

{

IMxDocument pMxDoc = (IMxDocument)_application.Document;

IMap pMap = pMxDoc.FocusMap;

}

vb code :

Private _application As IApplication

Public Property ArcMapApplication() As IApplication

Get

Return _application

End Get

Set(ByVal value As IApplication)

_application = value

End Set

End Property

c# code:

private IApplication _application;

public IApplication ArcMapApplication

{

get { return _application; }

set { _application = value; }

}

martywalters — Fri, 17 Jul 2015 06:21:53 GMT

Hussein Nasser himself solved it for me

Hussein, thanks for the Great Video series on Extending ArcObjects.

Double Thanks for providing me help.

OwenEarley — Fri, 17 Jul 2015 06:28:25 GMT

In what context are you running this code? - for example within an Add-In, old style COM extension, etc.

Has your _application object already been set or is it null?

EDIT - I got side-tracked and should have refreshed before posting to see if an answer had already been posted