Cannot resolve ambiguous reference

Question

Apparently I have 3 dlls with the same namespace (however the object browser says it only exists in one).

Usually in Resharper I can automatically resolve a reference, but in this case it won't do it. The type in question is ItemEvents_10_Event and when I search for that type here's what comes up:

enter image description here

I've tried prefixing the interface with Microsoft.Interop.Outlook, but it still complains with the same message.

Here's the usage in case that helps:

((ItemEvents_10_Event)MailItem).Send += OnSend;
((ItemEvents_10_Event)MailItem).BeforeAttachmentAdd += BeforeAttachmentAdd;
((ItemEvents_10_Event)MailItem).Write += OnInspectorSaved;

Note that I do not get any compile or runtime errors (at runtime my method never gets invoked), however the class has squiggly red lines under them which alerts me there is an issue.

score 2 · Accepted Answer · answered Mar 13 '15 at 23:51

2

This may be a case of needing extern alias. The error is occuring because you have 3 assemblies (.dlls), that all contain the same class in the same namespace.

In VS, select your reference that you want to use (Can be any of the 3), and give it an alias:

You can then use this in your file as:

extern alias MyAlias;
using ItemEvents_10_Event = MyAlias::Microsoft.Office.Interop.Outlook.ItemEvents_10_Event;

This will use the ItemEvents_10_Event from the .dll with the alias.

answered Mar 13 '15 at 23:51

Cyral

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Looks like a good start, now the next issue is `The extern alias 'OutlookAlias' was not specified in a /reference option` – The Muffin Man Mar 14 '15 at 00:01
I was actually reading that - the problem was that I typed in `OutlookAlias` and it didn't save (error on my part). Thanks. – The Muffin Man Mar 14 '15 at 00:04

Cannot resolve ambiguous reference

1 Answers1