可观察集合集合改变的问题
我正在学习可观察集合,因此我编写了一个小程序来测试我的进度。 我有一个可观察集合类,我从列表中提供初始值并将可观察集合绑定到数据网格。它工作得很好,但是当我使用 myListOfPlayers.myList.Clear() 清除列表时,数据网格不会清除。我认为 INotifyPropertyChanged 属性可以处理这个问题。我做错了什么?
public class PlayerList : ObservableCollection<PlayerName> //observable collection class
{
public PlayerList()
: base()
{
Clear();
foreach (var p in myListOfPlayers.myList.OrderBy(x => x.Score))
{
Add(p);
}
}
public PlayerList(List<PlayerName> list)
: base(list)
{
Clear();
foreach (var p in list)
{
Add(p);
}
}
}
我在 PlayerName 类中实现 INotifyPropertyChanged:
public class PlayerName : INotifyPropertyChanged
{
private string _name;
public string Name
{
get { return _name; }
set
{
_name = value;
OnPropertyChanged("Name");
}
}
private int _score;
public int Score
{
get { return _score; }
set
{
_score = value;
OnPropertyChanged("Score");
}
}
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName)
{
var handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(propertyName));
}
}
}
I am learning about observable collections, so I wrote a small program to test my progress.
I have a observable collection class that I supply initial values from a list and bind the observablecollection to a Datagrid. It works great, but when I clear the list using myListOfPlayers.myList.Clear(), the Datagrid does not clear. I thought that the INotifyPropertyChanged property would handle that. What am I doing wrong?
public class PlayerList : ObservableCollection<PlayerName> //observable collection class
{
public PlayerList()
: base()
{
Clear();
foreach (var p in myListOfPlayers.myList.OrderBy(x => x.Score))
{
Add(p);
}
}
public PlayerList(List<PlayerName> list)
: base(list)
{
Clear();
foreach (var p in list)
{
Add(p);
}
}
}
I implement INotifyPropertyChanged in the PlayerName class:
public class PlayerName : INotifyPropertyChanged
{
private string _name;
public string Name
{
get { return _name; }
set
{
_name = value;
OnPropertyChanged("Name");
}
}
private int _score;
public int Score
{
get { return _score; }
set
{
_score = value;
OnPropertyChanged("Score");
}
}
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName)
{
var handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(propertyName));
}
}
}
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如果您清除
myListOfPlayers.myList
,则PlayerList
不应被清除...这两个列表之间没有关系:您刚刚使用了myListOfPlayers.myList
来初始化PlayerList
的内容,但它们是两个不同的列表。您对其中一个所做的操作不会影响另一个If you clear
myListOfPlayers.myList
, thePlayerList
is not supposed to be cleared... There is no relation between these 2 lists: you just usedmyListOfPlayers.myList
to initialize the content ofPlayerList
, but they are two different lists. What you do on one of them doesn't affect the other