WORD DOM performance in c#

>Word.ApplicationClass WordApp = new Word.ApplicationClass();
>Word.Range wr = WordApp.Selection.Range;
>gramcount = wr.GrammaticalErrors.Count;
>
>for(i=1;i<=gramcount;i++)
>{
> errorword = wr.GrammaticalErrors.Item(i).Text.ToString();
>}

If you cache the GrammaticalErrors collection, you save one call per
iteration, which could make a difference (since marshaling and the
managed<->unmanaged transition makes interop calls slower then pure
managed calls). So try

Word.ProofreadingErrors grammaticalErrors = wr.GrammaticalErrors;
for(i=1;i<=gramcount;i++)
{
errorword = grammaticalErrors.Item(i).Text.ToString();
}

引文来源  WORD DOM performance in c#

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Word自动化，真是个头痛的事儿。