vsto发现无限

Question

            var intFound = 0;
            if (searchRange.Execute(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))
                while (rng.Find.Found)
                {
                        intFound++;
                        rng.Font.Color = Word.WdColor.wdColorBlue;

                    }

在上面的代码中，如果我添加任何其他操作，如添加索引字段或messagebox.show使循环变得无穷无尽。任何人都可以帮助我理解我哪里出错了吗？