#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

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