//新增引用：Microsoft.Office.Interop.Word.dll

Microsoft.Office.Interop.Word.Application app = new Microsoft.Office.Interop.Word.Application();
        object file = @"E:\1.doc";
        object nullobj = System.Reflection.Missing.Value;
        Microsoft.Office.Interop.Word.Document doc = app.Documents.Open(ref file, ref nullobj, ref nullobj, ref nullobj, ref nullobj, ref nullobj, ref nullobj, ref nullobj, ref nullobj, ref nullobj, ref nullobj, ref nullobj, ref nullobj, ref nullobj, ref nullobj, ref nullobj);
        string text = doc.Content.Text;
        doc.Close(ref nullobj, ref nullobj, ref nullobj);
        app.Quit(ref nullobj, ref nullobj, ref nullobj);
        Regex reg = new Regex(@"(?is)(?<=\bstart\b)(?:(?!\bend\b).)*");
        foreach (Match m in reg.Matches(text))
            Response.Write(m.Value);