C# 将异步消息分派到同步上下文中

封装一个异步方法类：

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using System; using System.Collections.Generic; using System.Collections.ObjectModel; using System.Collections.Specialized; using System.ComponentModel; using System.Linq; using System.Text; using System.Threading;   namespace K.Controls.Helper {     public class AsyncObervableCollection<T> : ObservableCollection<T>     {         private SynchronizationContext _synchronizationContext = SynchronizationContext.Current;         public AsyncObervableCollection()         {           }           public AsyncObervableCollection(IEnumerable<T> list) : base(list)         {           }         protected override void OnCollectionChanged(NotifyCollectionChangedEventArgs e)         {             if (SynchronizationContext.Current == _synchronizationContext)             {                 RaiseCollectionChanged(e);             }             else             {                 _synchronizationContext.Post(RaiseCollectionChanged, e);             }         }           private void RaiseCollectionChanged(object param)         {             base.OnCollectionChanged((NotifyCollectionChangedEventArgs)param);         }           protected override void OnPropertyChanged(PropertyChangedEventArgs e)         {             if (SynchronizationContext.Current == _synchronizationContext)             {                 RaisePropertychanged(e);             }             else             {                 _synchronizationContext.Post(RaisePropertychanged, e);             }         }           private void RaisePropertychanged(object param)         {             base.OnPropertyChanged((PropertyChangedEventArgs)param);         }       } }

　

调用以上封装类中的方法：

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public class QueryItemModel {     private AsyncObervableCollection<QueryItem> items;         public AsyncObervableCollection<QueryItem> Items         {             get { return items; }             set             {                 items = value;                 OnPropertyChanged(nameof(Items));             }         }           public QueryItemModel()         {             Items = new AsyncObervableCollection<QueryItem>();         } }     public QueryItemModel QueryItemModel { get; set; } public QueryItemViewModel(） {     QueryItemModel = new QueryItemModel(); }   void QueryItem() {     QueryItemModel.Items.Clear();     var item = chi.Adapt<QueryItem>();     item.Plu = result.Data.plu;     item.Sale_Price = chi.Sale_Price;     item.IsQuery = "0";     item.Key = chi.key;     QueryItemModel.Items.Add(item); }

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