主题：[求助]多线程操作

老师好！

下面的代码是循环操作Word文档中的行，行数多的话，就卡住了似的，怎样采用多线程处理？

谢谢！

Dim rgx As New RegularExpressions.Regex("'[\u4e00-\u9fa5].*")
Dim dlg As new OpenFileDialog
dlg.Filter = "word|*.doc;*.docx"
If dlg.ShowDialog = DialogResult.OK Then
    Dim app As New MSWord.Application
    try
        Dim doc = app.Documents.Open(dlg.FileName)
       
        For Each k As object In doc.Paragraphs
            If Len(Trim(k.Range.text)) = 1 Then
                k.Range.Delete    '删除空行
            ElseIf Trim(k.Range.text).StartsWith(chr(39)) Then
                k.Range.Delete       '删除段落的开头字符是单引号
            ElseIf rgx.IsMatch(k.Range.text) = True Then
                k.Range.text = rgx.Replace(k.Range.text,"") & vbcrlf
            End If
        Next
       
        doc.save
        app.quit
       
    catch ex As exception
        msgbox(ex.message)
        app.quit
    End try
End If
msgbox("OK")