Sitecore.Data.ID The call is ambiguous

In Sitecore you cannot compare an ID with NULL; it will produce the following error:

The call is ambiguous between the following methods or properties: ‘Sitecore.Data.ID.operator ==(Sitecore.Data.ID, Sitecore.Data.ID)’ and ‘Sitecore.Data.ID.operator ==(Sitecore.Data.ID, Sitecore.Data.ShortID)’

I.e. the following code is invalid:

Sitecore.Data.ID someID = GetSomeID();
if (someID == null)
  // do code

Instead, you need to call Sitecore.Data.ID.IsNullOrEmpty():

ID someID = GetSomeID();
if (Sitecore.Data.ID.IsNullOrEmpty(someID))
  // do code

A quick tip for you.

About briancaos

Developer at Pentia A/S since 2003. Have developed Web Applications using Sitecore Since Sitecore 4.1.
This entry was posted in c#, Sitecore, Sitecore 7 and tagged , . Bookmark the permalink.

3 Responses to Sitecore.Data.ID The call is ambiguous

  1. Kam says:

    You can remove the ambiguity if you wish like so as well:

    if(myId == (ID)null) { … }

    Though I suppose ID.IsNullOrEmpty() also checks for ID.Null.


  2. Mat says:

    Thx m8! Just what I neerded ;-)


  3. Pingback: Which of my old Sitecore posts are still valid in Sitecore 9? | Brian Pedersen's Sitecore and .NET Blog

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