• • 是的**，您的PersonViewModel应该实现INotifyPropertyChanged并在icon属性的setter中引发PropertyChanged事件（因此它会在每次更新后自动引发）。如果您的绑定正确，这将触发GUI的刷新。

代码：

public class PersonViewModel : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    private YourIconType _Icon;
    public YourIconType Icon
    {
        get { return _Icon; }
        set
        {
            _Icon = value;
            if (PropertyChanged != null)
                PropertyChanged.Invoke(this, 
                    new PropertyChangedEventArgs("Icon"));
        }
    }
}

首先，在wpf的ListView面前，记录计数实际上什么都不是，因为它使用了VirtualizingStackPanel。
除了PropertyChange Notification的确切解决方案之外，您还应该考虑一下deferred execution的概念，您似乎将所有内容转换为一个列表，这将导致立即强制枚举结果集。
让我们考虑一下您的代码：

_people= GetAll().ToList();  
//The result of GetAll is enumerated and a solid list is created

List<Person> allPeople = (from person in _people 
                          select new PersonViewModel(person)).ToList(); 
// another list created

AllPeople = new ObservableCollection<PersonViewModel>(allPeople); 
// ObservableCollection created out of list

让我们稍微调整一下：

_people= GetAll(); // The result is just referred by _people

IEnumerable<Person> allPeople = (from person in _people 
                                 select new PersonViewModel(person)); 
// IEnumerable is just provided with a query. No other operation is done

AllPeople = new ObservableCollection<PersonViewModel>(allPeople); 
// The ObservableCollection requests element from allPeople 
// which in turn requests from the query 
// which in turn requests from _people 
// which enumerates the result of GetAll() and yields the result.

因此，您可以避免创建临时列表。
此外，即使GetAll()方法不返回IEnumerable，也可以使其返回IEnumerable。
你可以看看
IEnumerable
IQueryable
yield