WPF-支持異步操做的ObservableCollection-AsyncObservableCollection

 

在進行WPF開發過程當中，須要從一個新的線程中操做ObservableCollection,結果程序拋出一個NotSupportedException的錯誤

 

public class AsyncObservableCollection<T> : ObservableCollection<T>
{
    //獲取當前線程的SynchronizationContext對象
    private SynchronizationContext _synchronizationContext = SynchronizationContext.Current;
    public AsyncObservableCollection() { }
    public AsyncObservableCollection(IEnumerable<T> list) : base(list) { }
    protected override void OnCollectionChanged(NotifyCollectionChangedEventArgs e)
    {
          
        if (SynchronizationContext.Current == _synchronizationContext)
        {
            //若是操做發生在同一個線程中，不須要進行跨線程執行         
            RaiseCollectionChanged(e);
        }
        else
        {
            //若是不是發生在同一個線程中
            //準確說來，這裏是在一個非UI線程中，須要進行UI的更新所進行的操做         
            _synchronizationContext.Post(RaiseCollectionChanged, e);
        }
    }
    private void RaiseCollectionChanged(object param)
    {
        // 執行         
        base.OnCollectionChanged((NotifyCollectionChangedEventArgs)param);
    }
    protected override void OnPropertyChanged(PropertyChangedEventArgs e)
    {
        if (SynchronizationContext.Current == _synchronizationContext)
        {
            // Execute the PropertyChanged event on the current thread             
            RaisePropertyChanged(e);
        }
        else
        {
            // Post the PropertyChanged event on the creator thread             
            _synchronizationContext.Post(RaisePropertyChanged, e);
        }
    }
    private void RaisePropertyChanged(object param)
    {
        // We are in the creator thread, call the base implementation directly         
        base.OnPropertyChanged((PropertyChangedEventArgs)param);
    }
}

View Code

 

https://blog.csdn.net/juns6/article/details/50964496