/// <summary>
/// 获取或设置指定位置的项目。
/// </summary>
/// <param name="index"></param>
/// <exception cref="ArgumentOutOfRangeException" />
/// <returns></returns>
public XspfTrack this[int index]
{
get
{
return(new XspfTrack(XEle.Elements("track").ElementAt(index)));
}
set
{
if (index == 0)
{
try { XEle.Element("track").Remove(); }
catch (NullReferenceException)
{ throw new ArgumentOutOfRangeException("index"); }
XEle.AddFirst(value.XEle);
}
else
{
XElement prev = XEle.Elements("track").ElementAt(index - 1);
try { prev.ElementsAfterSelf("track").First().Remove(); }
catch (NullReferenceException) { throw new ArgumentOutOfRangeException("index"); }
prev.AddAfterSelf(value.XEle);
}
}
}
/// <summary>
/// 在指定位置插入新的项目。
/// </summary>
/// <param name="index">要插入的位置</param>
/// <param name="item">要插入的项目</param>
/// <exception cref="ArgumentOutOfRangeException"/>
public void Insert(int index, XspfTrack item)
{
if (index == 0)
{
XEle.AddFirst(item.XEle);
}
else
{
XElement prev = XEle.Elements("track").ElementAt(index - 1);
prev.AddAfterSelf(item.XEle);
}
}