c# - 如何对可观察集合进行排序？

Question

我有以下类(class):

[DataContract]
public class Pair<TKey, TValue> : INotifyPropertyChanged, IDisposable
{
    public Pair(TKey key, TValue value)
    {
        Key = key;
        Value = value;
    }

    #region Properties
    [DataMember]
    public TKey Key
    {
        get
        { return m_key; }
        set
        {
            m_key = value;
            OnPropertyChanged("Key");
        }
    }
    [DataMember]
    public TValue Value
    {
        get { return m_value; }
        set
        {
            m_value = value;
            OnPropertyChanged("Value");
        }
    }
    #endregion

    #region Fields
    private TKey m_key;
    private TValue m_value;
    #endregion

    #region INotifyPropertyChanged Members

    public event PropertyChangedEventHandler PropertyChanged;

    protected void OnPropertyChanged(string name)
    {
        PropertyChangedEventHandler handler = PropertyChanged;
        if (handler != null)
        {
            handler(this, new PropertyChangedEventArgs(name));
        }
    }

    #endregion

    #region IDisposable Members

    public void Dispose()
    { }

    #endregion
}

我将其放入 ObservableCollection 中:

ObservableCollection<Pair<ushort, string>> my_collection = 
    new ObservableCollection<Pair<ushort, string>>();

my_collection.Add(new Pair(7, "aaa"));
my_collection.Add(new Pair(3, "xey"));
my_collection.Add(new Pair(6, "fty"));

问:如何按键排序？

Answer 1

这个简单的扩展对我来说效果很好。我只需要确保 MyObject 是 IComparable。当对 MyObjects 的可观察集合调用排序方法时，将调用 MyObject 上的 CompareTo 方法，这将调用我的逻辑排序方法。虽然它没有此处发布的其余答案的所有功能，但这正是我所需要的。

static class Extensions
{
    public static void Sort<T>(this ObservableCollection<T> collection) where T : IComparable
    {
        List<T> sorted = collection.OrderBy(x => x).ToList();
        for (int i = 0; i < sorted.Count(); i++)
            collection.Move(collection.IndexOf(sorted[i]), i);
    }
}

public class MyObject: IComparable
{
    public int CompareTo(object o)
    {
        MyObject a = this;
        MyObject b = (MyObject)o;
        return Utils.LogicalStringCompare(a.Title, b.Title);
    }

    public string Title;

}
  .
  .
  .
myCollection = new ObservableCollection<MyObject>();
//add stuff to collection
myCollection.Sort();