c# Excel Interop (v.10.0.4504.0) Automation add-in functions not available

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Hello,

I have installed an Excel AddIn (automation excel AddIn - mscoree.dll)
This AddIn has an Function called MyFunction.
When i start Excel.exe the AddIn will be loaded (LoadBehavior = 3, OPEN = /A "MyAddIn")
I can see and use MyFunction, but when i use the Microsoft.Office.Interop.Excel i don't have the Function.
The ExcelAddInManager show me that the AddIn is loaded and

C#

m_ExcelApp.AddIns(MyAddIn).Installed = true [mscoree.dll]

What i what do to:

C#

((Excel.Application)m_ExcelApp).Evaluate("=MyFunction()");

What is my Question:
What i have to do to use the Function in MyAddin when i use the Interop of Excel?

Posted 17-Jan-12 22:29pm

hulzi

Updated 17-Jan-12 22:41pm

Anuja Pawar Indore

v2

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hulzi · Accepted Answer · 2012-01-17T23:20:00

after 3 days debugin and afert poste my problem i have the solution :-)

m_ExcelApp.AddIns(mscorre.dll) says, that the AddIn (Automation AddIn) is installed.
But this is wrong.

You have to set the property to false.
Then Register the .dll again and set the property to true.

foreach (Excel.AddIn a in m_ExcelApp.AddIns)
{
if (a.Name.StartsWith("mscoree")) //Test - Temp
{
a.Installed = false;
m_ExcelApp.RegisterXLL(a.FullName);
a.Installed = true;
}
}