c# - Word 文書の読み取り速度が非常に遅い

Question

MS Interop lib でワード文書を読みました。でも50ページのワード文書は一語一語読むのに30分

私のコード:

var app = new ApplicationClass();
object file = filePath;
object nullobject = Missing.Value;

var doc = app.Documents.Open
    (ref file, ref nullobject, ref nullobject, ref nullobject,
    ref nullobject, ref nullobject, ref nullobject, ref nullobject,
    ref nullobject, ref nullobject, ref nullobject, ref nullobject,
    ref nullobject, ref nullobject, ref nullobject, ref nullobject);

doc.ActiveWindow.Selection.WholeStory();
doc.ActiveWindow.Selection.Copy();
app.Visible = false;