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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(
	ref Array custom


Type: System.Array

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)
        AddIn addIn = this.dte.addins.item("MyAddin1.Connect");
        if (addInInstance.Connected == true)
            System.Windows.Forms.MessageBox.Show("This add-in is 
            System.Windows.Forms.MessageBox.Show("This add-in is not 

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

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