封装一个异步方法类：
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：
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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