How to set Enterprise Keywords
taxonomy field value using SharePoint CSOM
Since Taxonomy API is supported in SharePoint 2013 CSOM, the following example demonstrates how to set Enterprise Keywords field value:
using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.SharePoint.Client;
using Microsoft.SharePoint.Client.Taxonomy;
namespace SharePoint.Client.Taxonomy
{
/// <summary>
/// Enterpise Keyword Manager
/// </summary>
public class KeywordsManager
{
/// <summary>
/// Set Enterprise Keyword Value
/// </summary>
/// <param name="item">List Item</param>
/// <param name="values">Keyword values</param>
public static void SetTaxKeywordValue(ListItem item,string[] values)
{
var ctx = item.Context;
var list = item.ParentList;
var field = list.Fields.GetByInternalNameOrTitle(TaxKeywordFieldName);
var taxKeywordField = ctx.CastTo<TaxonomyField>(field);
ctx.Load(item,i=>i[TaxKeywordFieldName]);
var keywords = values.Select(value => EnsureKeyword(taxKeywordField, value)).ToList();
taxKeywordField.SetFieldValueByValueCollection(item, new TaxonomyFieldValueCollection(ctx, GetTermsString(keywords), taxKeywordField));
}
/// <summary>
/// Ensure Keyword
/// </summary>
/// <param name="taxField"></param>
/// <param name="name"></param>
/// <returns></returns>
private static Term EnsureKeyword(TaxonomyField taxField, string name)
{
var ctx = taxField.Context;
var taxSession = TaxonomySession.GetTaxonomySession(ctx);
var termStore = taxSession.GetDefaultKeywordsTermStore();
var keywords = termStore.KeywordsTermSet.GetAllTerms();
var result = ctx.LoadQuery(keywords.Where(k => k.Name == name));
ctx.ExecuteQuery();
var keyword = result.FirstOrDefault();
if (keyword != null)
{
return keyword;
}
keyword = termStore.KeywordsTermSet.CreateTerm(name, DefaultLanguage, Guid.NewGuid());
ctx.Load(keyword);
ctx.ExecuteQuery();
return keyword;
}
/// <summary>
/// Retrieve formatted Term string
/// </summary>
/// <param name="term"></param>
/// <returns></returns>
private static string GetTermString(Term term)
{
return string.Format("-1;#{0}{1}{2}", term.Name, TaxonomyGuidLabelDelimiter,term.Id);
}
private static string GetTermsString(IEnumerable<Term> terms)
{
var termsString = terms.Select(GetTermString).ToList();
return string.Join(";#", termsString);
}
private const string TaxKeywordFieldName = "TaxKeyword";
private const int DefaultLanguage = 1033;
private const string TaxonomyGuidLabelDelimiter = "|";
}
}
Usage
using (var ctx = new ClientContext(webUri))
{
var list = ctx.Web.Lists.GetByTitle(listTitle);
var item = list.GetItemById(itemId);
KeywordsManager.SetTaxKeywordValue(item,new []{"2013","2010"});
item.Update();
ctx.ExecuteQuery();
}
Results
For a more details please follow Enterprise Keywords management in Office 365 via CSOM post.