c＃Office Interop在大型文档中循环浏览每个单词时速度很慢

Question

I have the following code segment which loops through each word in a Word document, finds lines (sentences) which are bolded and stores them in a list, MasterSentences .

Microsoft.Office.Interop.Word.Application word = new Microsoft.Office.Interop.Word.Application();
Document doc = new Document();
object path = fileDialog.FileName;
object missing = Type.Missing;

doc = word.Documents.Open(ref path, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing);
string sentence = "";
foreach (Range rng in doc.StoryRanges)
{
    foreach (Range rngWord in rng.Words)
    {
        if ((rngWord.Text.Contains("\n") || rngWord.Text.Contains("\r")) && sentence != "")
        {
            MasterSentences.Add(sentence);
            sentence = "";
        }
        else if (rngWord.Bold != 0 && rngWord.Text != " " && rngWord.Text != "\t")
        {
            sentence += rngWord.Text;
        }
    }
}

The problem is this takes around 3-4 minutes to complete for a Word document with 23,742 words.

Is there any way to improve the speed? Is there a more efficient way to accomplish this?

Answer 1

Thank you guys for all your feedback. It seems using Range.Find.Execute was the right way. Here's my updated mostly working code. It takes only around 20 seconds now which is perfect.

Range rngFindBold = doc.Range();
rngFindBold.Find.Font.Bold = 1;
while (rngFindBold.Find.Execute(Format: true))
{
    if (!string.IsNullOrWhiteSpace(rngFindBold.Text))
    {
        MasterSentences.Add(rngFindBold.Text);
    }
}