How to separate CustomUI tags in Excel-DNA from OnAction methods?

Question

In my .dna file I have:

<DnaLibrary Name="First Add-In" RuntimeVersion="v4.0" Language="C#">
  <ExternalLibrary Path="MyLibrary.dll" Pack="true"/>  
  <Image Name="M" Path="M.png" Pack="true" />
  <CustomUI>
    <customUI xmlns='http://schemas.microsoft.com/office/2009/07/customui' loadImage='LoadImage'>
      <ribbon>
        <tabs>
          <tab id='CustomTab' label='My 2010 Tab'>
            <group id='SampleGroup' label='My Sample Group'>
              <button id='Button1' label='My Second Button' image='M' size='normal' onAction='RunTagMacro' tag='ReformatSelection='/>
            </group >
          </tab>
        </tabs>
      </ribbon>
    </customUI>
  </CustomUI>  
</DnaLibrary>

In my .cs file I have:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using ExcelDna.Integration;
using System.Runtime.InteropServices;
using ExcelDna.Integration.CustomUI;
using System.Windows.Forms;

namespace MyLibrary
{
    [ComVisible(true)]
    public class Class1 : ExcelRibbon
    {                

        public void ReformatSelection(IRibbonControl control)
        {
            MessageBox.Show("Hello");
        } 
    }
}

When I load the addin the button and tab appears fine in the Ribbon, but clicking the button does not run the ReformatSelection method. In the example files provided with Excel-DNA all the subs and functions that are hooked to the onAction events are in the .dna file. I am trying to move them out of the .dna file and into the .cs file. What am I doing wrong?

Answer 1

Your signature for ReformatSelection() is not right for the onAction handler of a ribbon button.

It should be:

public void ReformatSelection(IRibbonControl control) {...}

You can get a list of all the Office Ribbon callbacks signatures here: http://msdn.microsoft.com/en-us/library/aa722523(v=office.12).aspx