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Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

IDTExtensibility2.OnAddInsUpdate Method

Occurs whenever an add-in is loaded or unloaded from the Visual Studio integrated development environment (IDE).

Namespace: Extensibility
Assembly: Extensibility (in extensibility.dll)

void OnAddInsUpdate (
	[InAttribute] ref Array custom
)
void OnAddInsUpdate (
	/** @attribute InAttribute() */ /** @ref */ Array custom
)
JScript does not support passing value-type arguments by reference.

Parameters

custom

An empty array that you can use to pass host-specific data for use in the add-in.

This method is most often used to enforce dependencies on other add-ins. That is, if an add-in requires the presence of another add-in (or other program) before it can run properly, you can check the status with this method.

An add-in triggers the OnAddInsUpdate event when an add-in loads in the environment for the first time in that session, and whenever the OK button in the Add-In Manager is clicked. It does not trigger when an add-in is loaded by a command or when it is loaded by way of its Connected property.

To obtain the name of the add-in that has changed, iterate through the AddIns collection and check each add-in's Connected property. You can access each add-in by using either its ProgID or 1-based index value. If the index does not exist, an "invalid index" COMException error occurs. Otherwise, it returns an AddIn reference.

public void OnAddInsUpdate(ref Array custom)
{
    try
    {
        AddIn addIn = this.dte.addins.item("MyAddin1.Connect");
        if (addInInstance.Connected == true)
        {
            System.Windows.Forms.MessageBox.Show("This add-in is 
            connected.");
        }
        else
        {
            System.Windows.Forms.MessageBox.Show("This add-in is not 
            connected.");
        }
    }

    catch (COMException)
    {
         System.Windows.Forms.MessageBox.Show("Not a registered add-
         in.");
    }
}

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