引用PanGuDLL 

private string GetWords(string input)

    {

        ICollection<PanGu.WordInfo> words = new Segment().DoSegment(input);

        StringBuilder result = new StringBuilder();

        List<string> list = new List<string>();

        foreach (WordInfo word in words)

        {

            if (word != null && word.Word.Length > 1)

            {

                bool has = false;

                foreach (string w in list)

                {

                    if (string.Compare(w, word.Word, true) == 0)

                    {

                        has = true;

                        break;

                    }

                }

                if (has)

                    continue;

                list.Add(word.Word);

                result.Append(word.Word).Append(",");

            }

        }

        if (result.Length > 0)

            return result.ToString(0, result.Length - 1);

        else

            return string.Empty;

    }