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如何转换IEnumerable为ObservableCollection？

我有以下课程:

[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 …