如何对对象列表进行排序?OrderBy c#
我有如何对对象列表进行排序?OrderBy c#,c#,C#,我有曲目课 class Track { public String Name { get; set; } public Double Duration; public Boolean IsRemix; public override string ToString() { if (IsRemix) return Name + "(Remix) " + Duration; return Name + " " + Durati
曲目
课
class Track
{
public String Name { get; set; }
public Double Duration;
public Boolean IsRemix;
public override string ToString()
{
if (IsRemix) return Name + "(Remix) " + Duration;
return Name + " " + Duration;
}
}
相册是一个列表:
class Album :List<Track>
{
public Album SortByAlphabet()
{
return new Album().OrderBy(x=>x.Name);
}
}
及
没用
这是正在引发异常,InvalidCastException
class Album : List<Track>
{
public Album SortByAlphabet()
{
return (Album)(this.OrderBy(o => o.Name).ToList());
}
}
class相册:列表
{
公共相册Sortbylphabet()
{
return(相册)(this.OrderBy(o=>o.Name.ToList());
}
}
我不建议从列表继承,但如果您这样做,以下内容应满足您的要求:
class Album : List<Track>
{
public Album() : base() { }
public Album(IEnumerable<Track> tracks) : base(tracks) { }
/// <summary>
/// Sort in place the album of tracks alphabetically by name
/// </summary>
public void SortByAlphabet()
{
Sort((t1, t2) => t1.Name.CompareTo(t2.Name));
}
/// <summary>
/// Return a new Album with tracks sorted alphabetically by name.
/// </summary>
/// <returns></returns>
public Album OrderByAlphabet()
{
return new Album(this.OrderBy(t => t.Name));
}
}
class相册:列表
{
公共相册():基(){}
公共专辑(IEnumerable曲目):基本(曲目){}
///
///按名称的字母顺序对唱片集进行就地排序
///
public void SortByAlphabet()
{
排序((t1,t2)=>t1.Name.CompareTo(t2.Name));
}
///
///返回按名称字母顺序排列的曲目的新专辑。
///
///
公共相册OrderByAlphabet()
{
返回新相册(this.OrderBy(t=>t.Name));
}
}
不从列表继承
专辑有一个歌曲列表,你可以用一个成员来表示。它使用了跟踪的实现(老实说,我不会使用布尔值
,双值
,等等,也不会有裸露的公共字段,但这是另一个讨论。)
我建议不要从列表继承。您可以找到更多信息。OrderBy()
不会对集合进行排序,而是按排序顺序在集合上迭代。如果您想对列表进行排序,请致电。。。这就是它存在的原因。引发异常时,InvalidCastException考虑建议指定String.Compare()
,并允许区域性敏感的比较。我当然和你一样担心相册
充当`列表、排序器和
比较器'。
class Album : List<Track>
{
public Album SortByAlphabet()
{
return (Album)(this.OrderBy(o => o.Name).ToList());
}
}
class Album : List<Track>
{
public Album() : base() { }
public Album(IEnumerable<Track> tracks) : base(tracks) { }
/// <summary>
/// Sort in place the album of tracks alphabetically by name
/// </summary>
public void SortByAlphabet()
{
Sort((t1, t2) => t1.Name.CompareTo(t2.Name));
}
/// <summary>
/// Return a new Album with tracks sorted alphabetically by name.
/// </summary>
/// <returns></returns>
public Album OrderByAlphabet()
{
return new Album(this.OrderBy(t => t.Name));
}
}
class Album {
private readonly List<Track> _tracklist;
public ReadOnlyCollection<Track> Tracklist {
get {
return new ReadOnlyCollection<Track>(_tracklist);
}
}
public Album(IEnumerable<Track> tracklist) {
_tracklist = new List<Track>(tracklist);
}
}
var album = new Album(new List<Track> {
new Track { Name = "Blonde"},
new Track { Name = "K.-O."},
new Track { Name="Alcaline"},
new Track { Name="Seulement pour te plaire"},
new Track { Name="L'amour renfort"},
new Track { Name="Bi"},
new Track { Name="Mon planeur"},
new Track { Name="Ce qui tue l'amour"},
new Track { Name="Tweet"},
new Track { Name="Charles est stone"},
new Track { Name="Mylène Farmer"},
new Track { Name="Plus de bye bye"}
});
var culture = new CultureInfo("fr-FR");
var tracks = album.Tracklist.OrderBy(t => t.Name, StringComparer.Create(culture, false));
tracks.ToList().ForEach(Console.WriteLine);