How to add a term to TermCollection (taxonomy field) - sharepoint

Question

In sharePoint 2010, I want to set taxonomy values of a document field. The field can take multiple taxonomy terms.
I am doing it the wrong way because the cast of taxoTerms.Concat(terms) in TermCollection class fails :
TaxonomyField taxoField = file.Item.Fields.GetFieldByInternalName(entry.Key)
as TaxonomyField;
TaxonomySession taxoSession = new TaxonomySession(web.Site);
TermStore store = taxoSession.TermStores[taxoField.SspId];
TermSet termSet = store.GetTermSet(taxoField.TermSetId);
if (taxoField.AllowMultipleValues)
{
string[] taxoValues = entry.Value.Split(';');
TermCollection taxoTerms = termSet.GetTerms(taxoValues[0], true);
for (int j = 1; j < taxoValues.Length; j++)
{
TermCollection terms = termSet.GetTerms(taxoValues[j], true);
if (terms.Count > 0)
{
taxoTerms = (TermCollection)taxoTerms.Concat(terms);
}
}
taxoField.SetFieldValue(file.Item, taxoTerms);
}
Do you know how can I add terms to my TermCollection object so I can save the term values in the field ?

Answer 1

I found my solution. Here it is :
TaxonomyField taxoField =
file.Item.Fields.GetFieldByInternalName(entry.Key) as TaxonomyField;
TaxonomySession taxoSession = new TaxonomySession(web.Site);
TermStore store = taxoSession.TermStores[taxoField.SspId];
TermSet termSet = store.GetTermSet(taxoField.TermSetId);
if (taxoField.AllowMultipleValues)
{
string[] taxoValues = entry.Value.Split(';');
TermCollection terms = termSet.GetAllTerms();
List<string> taxonomyValueList = taxoValues.ToList<string>();
TaxonomyFieldValueCollection fieldValues = new TaxonomyFieldValueCollection(taxoField);
foreach (Term term in terms)
{
if (taxonomyValueList.Contains(term.Name))
{
TaxonomyFieldValue fieldValue = new TaxonomyFieldValue(taxoField);
fieldValue.TermGuid = term.Id.ToString();
fieldValue.Label = term.Name;
fieldValues.Add(fieldValue);
}
}
taxoField.SetFieldValue(file.Item, fieldValues);
}
Hope it helps others.

Answer 2

Here is a sample that could work:
var item = file.Item;
var taxonomyField = item.Fields.GetFieldByInternalName(entry.Key);
var values = new TaxonomyFieldValueCollection(taxonomyField);
values.PopulateFromLabelGuidPairs(entry.Value);
item[entry.Key] = values;
item.Update();
I did not test it on a life system so there can be some additional work, but I hope you get the general idea. The values in the entry.Value string have to contain the | and ; separated list of tags. If the tag does not exist you have to create it and get its id before you save it to the item.
HTH
Vojta