词.互操作文档已关闭

我正在尝试将单词拼写检查集成到WinForms应用程序中。到目前为止，互操作库一直是一个令人头疼的问题。折腾了好几个小时后，我终于让拼写检查工作起来了。CheckSpellingOnce以及底层CheckSpelling方法按预期执行，但是只要我调用getspellingsuggestion，应用程序就会抛出…

抛出异常:'System.Runtime.InteropServices. '附加信息:该命令不存在

第一个想法是底层COM对象从其各自的包装器断开连接，因为_wordApp是从创建它的不同线程调用的。因此，我尝试从CheckSpelling()中调用它，不幸的是结果相同。我还尝试打开和关闭文档，向现有应用程序实例添加新文档，以及从_document对象本身(_document. application . getspellingsuggestions)获取应用程序。

那是怎么回事呢?

额外的信息:CheckSpellingOnce方法从UI调用时，计时器事件被触发(一旦用户停止在RichTextField输入)-所以多次-使用相同的_wordApp对象，因为我试图避免启动多个实例的winword.exe。

    /// <summary>
    /// Checks spelling with the text from the provided richtextbox in a new thread.
    /// </summary>
    public void CheckSpellingOnce()
    {
        _checkerThread = new Thread(new ThreadStart(CheckSpelling));
        _checkerThread.Start();
    }
    /// <summary>
    /// Checks the spelling of a richtextbox. Raises an event with the result when done.
    /// </summary>
    private void CheckSpelling()
    {
        if (_shouldBeChecking)
        {
            RaiseStatusChanged(SpellCheckStatus.Working);
            Word.ProofreadingErrors toReturn = null;
            UpdateStringFromTextBox();
            if (!string.IsNullOrEmpty(_fromTextBox))
            {
                _document.Content.Delete();
                _document.Words.First.InsertBefore(_fromTextBox);
                _document.Content.LanguageID = _language; //Must be set specifically here for some f***d reason.
                toReturn = _document.SpellingErrors;
                RaiseSpellingChecked(toReturn);
                RaiseStatusChanged(SpellCheckStatus.Idle);
            }
        }
    }
    public Word.SpellingSuggestions GetSpellingSuggestions(string word)
    {
        //throw new NotImplementedException();
        Word.SpellingSuggestions toReturn = _wordApp.GetSpellingSuggestions(word, _missing, _missing, _missing, _missing, _missing,  _missing);
        return toReturn;
    }

即使使用了GetSpellingSuggestions的实现，它也会在"toReturn"行发出报错，而不是在它上面的行…

        public void GetSpellingSuggestions(string word)
    {
        //throw new NotImplementedException();
        var _suggestionThread = new Thread(new ThreadStart(() =>
        {
            _document.Content.Delete();
            _document.Words.First.InsertBefore(word);
            _document.Content.LanguageID = _language;
            Word.SpellingSuggestions toReturn = _wordApp.GetSpellingSuggestions(word, _missing, _missing, _missing, _missing, _missing, _missing);
            Debug.Print(toReturn[0].ToString());
        }));
        _suggestionThread.Start();
    }

        /// <summary>
        /// Opens a Word interop lib document.
        /// </summary>
        /// <returns></returns>
        private Word._Document OpenDocument()
        {
            object visible = false;
            _document = _wordApp.Documents.Add(_missing, _missing, _missing, visible);
            return _document;
        }