I have a vb.net arcmap addin which provide a function to validate geodb topology. But there is a problem, when I am not in editing session and use the function, arcmap will crash. In this case I intend to check whether the map is in editing session.

Is there a way to check whether arcmap is in editing session?

I am using vb.net and arcmap 10.2.

2 Answers 2


You can check for the EditState on the editor extension.

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  • Thanks Jay, It works! I have put my code below in case it is useful.
    – ppLily
    Commented Sep 9, 2014 at 3:06

After Jay's help, I have successfully check when arcmap is in editing session, the code is as floows:

    Dim editorUid As New UID()
    editorUid.Value = "esriEditor.Editor"
    m_editor = TryCast(My.ArcMap.Application.FindExtensionByCLSID(editorUid), IEditor3)
    m_editEvents = TryCast(m_editor, IEditEvents_Event)
    If m_editor.EditState = esriEditState.esriStateNotEditing Then
        MsgBox("You must in editing session to validate the topology")
    End If
  • 1
    I'm not familiar with the VB AddIn's but for CSharp, the first 3 lines are duplicate what is in the ArcMap class (internal static class found in your AddIn's namespace), which already exposes an IEditor for AddIn editor extensions. Commented Sep 9, 2014 at 12:21

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