C#文字换行的实现方法

#region 文字换行
/// <summary>
/// 文字换行
/// <para>eg:stringhelper.wraptext("yanzhiwei", 3);==>"yan\r\nzhi\r\nwei"</para>
/// </summary>
/// <param name="data">需要换行的文字</param>
/// <param name="maxwidth">多少长度换行</param>
/// <returns>换行好的文字</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);
}