unable to get all the term sets under a term group inside my event receiver

Question

I am developing an ItemUpdated event receiver inside my on-premises farm 2013. and inside my event receiver i want to get all the term sets under a term group. so i define the following :-

using (SPSite site = new SPSite(properties.SiteId))
       {
             string currenweburl = properties.RelativeWebUrl;
             using (SPWeb spCurrentSite = site.OpenWeb(currenweburl))
                     {

                       Term currenttermset = null;
                       TaxonomySession txSession = new TaxonomySession(site);
                       TermStore tc = txSession.TermStores[termstorename.Trim()];
                       Group g = tc.Groups[groupname.Trim()];
                       TermSet ts = g.TermSets[termsetname.Trim()];

now getting the TaxonomySession + TermStore + Group always work fine. But when it comes to the following code TermSet ts = g.TermSets[termsetname.Trim()]; i keeping getting the following exception:-

Specified argument was out of the range of valid values.

and when i check the term store count when debugging the code i found that the count will be equal to 0. while i already have one term set which is used to store the navigation terms. here is the count inside Visual Studio:-

also in one case i added a new term group, then i add a new term set, and i use this term set for site navigation. now i was able to retrieve the term set correctly inside the event receiver. but when i added another term set under the same group, the code raised the above exception, and the term set count will be equal to 0 again while debugging the code. so not sure how i can get all the term sets under my term group ? same as the term sets which will be shown inside the "Site Settings" >> "Term Store Management" page?? in all ways not sure why my code was not able to achieve this ?

Answer 1

Please try this once.

private static TermSet RetrunTermSetIfExists(ClientContext clientContext, TermGroup termGroup, string termSetName)
    {
        clientContext.Load(termGroup.TermSets);
        clientContext.ExecuteQuery();
        TermSet termset = termGroup.TermSets.FirstOrDefault(x => x.Name.ToLower() == termSetName.ToLower());
        if (termset == null)
        {
            return null;
        }
        else
        {
            clientContext.Load(termset);
            clientContext.ExecuteQuery();
            return termset;
        }
    }

Sorry. The above code is for CSOM. But it works perfectly.

Answer 2

Your navigation term set has "Available for tagging" unchecked. Term sets marked as such will not be found in code. You need to make sure "available for tagging" is checked on the term set.