/// <summary>
/// 修改某一首歌的节点值
/// </summary>
/// <param name="Title">标题</param>
/// <param name="ElementName">节点名</param>
/// <param name="ElementValue">修改值</param>
public void ModifyMusic(string Title, string ElementName, int ElementValue)
{
//保存原始的节点值
string Node_Title = string.Empty;
string Node_Url = string.Empty;
string Node_Type = string.Empty;
string Node_Like = string.Empty;
string Node_Listen = string.Empty;
//查询
XElement Xe = XElement.Load(XmlFilePath);
IEnumerable <XElement> Elements = from Musics in Xe.Elements("Music") where Musics.Element("Title").Value == Title select Musics;
//得到原始的值
if (Elements.Count() > 0)
{
foreach (XElement E in Elements)
{
Node_Title = E.Element("Title").Value;
Node_Url = E.Element("Url").Value;
Node_Type = E.Element("Type").Value;
Node_Like = E.Element("Like").Value;
Node_Listen = E.Element("Listen").Value;
}
}
//修改
XElement XEl = Elements.First();
//确定是修改Listen还是很Like节点
if (ElementName == "Listen")
{
//修改Listen的值
int ListenValue = Convert.ToInt32(Node_Listen) + ElementValue;
XEl.ReplaceNodes(
new XElement("Title", Node_Title),
new XElement("Url", Node_Url),
new XElement("Type", Node_Type),
new XElement("Like", Node_Like),
new XElement("Listen", ListenValue));
Xe.Save(XmlFilePath);
}
else
{
if (ElementName == "Like")
{
int LikeValue = Convert.ToInt32(Node_Like) + ElementValue;
XEl.ReplaceNodes(
new XElement("Title", Node_Title),
new XElement("Url", Node_Url),
new XElement("Type", Node_Type),
new XElement("Like", LikeValue),
new XElement("Listen", Node_Listen));
Xe.Save(XmlFilePath);
}
}
}
/// <summary>
/// 返回指定歌曲名称的Music
/// </summary>
/// <returns></returns>
public Music GetMusic(string Title)
{
Music m = null;;
//加载文件
XElement Xe = XElement.Load(this.XmlFilePath);
//读取列表
IEnumerable <XElement> Elements = from Musics in Xe.Elements("Music") where Musics.Element("Title").Value == Title select Musics;
foreach (XElement Element in Elements)
{
m = new Music(Element.Element("Title").Value,
Element.Element("Url").Value,
Convert.ToInt32(Element.Element("Like").Value),
Convert.ToInt32(Element.Element("Listen").Value),
GetTypeByValue(Element.Element("Type").Value));
}
return(m);
}
/// <summary>
/// 删除根据满足某个节点值条件的歌曲
/// </summary>
/// <param name="Value"></param>
public void DeleteMusic(string ElementName, string ElementValue)
{
XElement Xe = XElement.Load(XmlFilePath);
IEnumerable <XElement> Elements = from Musics in Xe.Elements("Music") where Musics.Element(ElementName).Value == ElementValue select Musics;
if (Elements.Count() > 0)
{
Elements.First().Remove();
}
Xe.Save(XmlFilePath);
}