關鍵代碼：

     #region 文字換行        /// <summary>        /// 文字換行        /// <para>eg:StringHelper.WrapText("YanZhiwei", 3);==>"Yan/r/nZhi/r/nwei"</para>        /// </summary>        /// <param name="data">需要換行的文字</param>        /// <param name="maxWidth">多少長度換行</param>        /// <returns>換行好的文字</returns>        public static string WrapText(this string data, int maxWidth)        {            int _stringCount = data.Length;            if (maxWidth > 0 && _stringCount > maxWidth)            {                StringBuilder _builderString = new StringBuilder(data);                int _breakCount = _builderString.Length / maxWidth;                for (int i = 0; i < _breakCount; i++)                {                    int _insertPosition = i * maxWidth;                    if (_insertPosition != 0)                    {                        int _offset = (i - 1) * 2;//(/r/n)                        _builderString.Insert(_insertPosition + _offset, Environment.NewLine);                    }                }                return _builderString.ToString();            }            else            {                return data;            }        }        #endregion

測試：

        [TestMethod()]        public void WrapTextTest()        {            string _actual = StringHelper.WrapText("YanZhiwei", 3);            Assert.AreEqual<string>(@"YanZhiwei", _actual);        }

結果：

希望有所幫助！