62 lines
2.3 KiB
C#
62 lines
2.3 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.Collections.Specialized;
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using System.ComponentModel;
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using System.Linq;
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using System.Text;
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using System.Threading;
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namespace TouchCashier
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{
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/// <summary>
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/// 线程安全的集合，将ObservableCollection替换掉即可
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/// </summary>
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/// <typeparam name="T"></typeparam>
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public class AsyncObservableCollection<T> : ObservableCollection<T>
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{
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//获取当前线程的SynchronizationContext对象
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private SynchronizationContext _synchronizationContext = SynchronizationContext.Current;
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public AsyncObservableCollection() { }
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public AsyncObservableCollection(IEnumerable<T> list) : base(list) { }
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protected override void OnCollectionChanged(NotifyCollectionChangedEventArgs e)
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{
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if (SynchronizationContext.Current == _synchronizationContext)
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{
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//如果操作发生在同一个线程中，不需要进行跨线程执行
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RaiseCollectionChanged(e);
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}
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else
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{
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//如果不是发生在同一个线程中
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//准确说来，这里是在一个非UI线程中，需要进行UI的更新所进行的操作
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_synchronizationContext.Post(RaiseCollectionChanged, e);
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}
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}
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private void RaiseCollectionChanged(object param)
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{
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// 执行
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base.OnCollectionChanged((NotifyCollectionChangedEventArgs)param);
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}
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protected override void OnPropertyChanged(PropertyChangedEventArgs e)
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{
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if (SynchronizationContext.Current == _synchronizationContext)
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{
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// Execute the PropertyChanged event on the current thread
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RaisePropertyChanged(e);
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}
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else
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{
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// Post the PropertyChanged event on the creator thread
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_synchronizationContext.Post(RaisePropertyChanged, e);
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}
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}
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private void RaisePropertyChanged(object param)
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{
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// We are in the creator thread, call the base implementation directly
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base.OnPropertyChanged((PropertyChangedEventArgs)param);
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}
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}
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}
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