从另一个线程更新ObservableCollection

本文关键字：ObservableCollection 更新 线程 另一个 | 更新日期: 2023-09-27 18:04:24

我有一个问题。找了很多，却找不到解决的办法。我需要，从另一个线程，更新一个ObservableCollection没有UI冻结。我使用NET4.0。这段代码不允许我看到"ProgressRing"answers"Searching"消息。谢谢!

private void Search()
    {
        ShowMessage = "Searching..."; // Message while the search is made.
        IsBusy = true; // Show WPF Toolkit BusyIndicator
        ShowProgressRing = true; // To show a ProgressRing in BusyIndicator
        Task.Factory.StartNew(() =>
        {
            Articles = new ObservableCollection<Article>();
            /////////////////////////////
            //// Simulate SQL query ////
            ///////////////////////////
           for (var i = 0; i < 1000; i++)
           {
               Articles.Add(new Article
               {
                   Code = i.ToString(),
                   Name = "PRODUCT NAME",
                   Price = 1m
               });
           }
        }).ContinueWith(x =>
        {
            IsBusy = false; // Hide
        }, TaskScheduler.FromCurrentSynchronizationContext());
    }

编辑

private bool _showProgressRing;
public bool ShowProgressRing
{
    get { return _showProgressRing; }
    set
    {
        _showProgressRing = value;
        RaisePropertyChanged("ShowProgressRing");
    }
}
private bool _isBusy;
public bool IsBusy
{
    get { return _isBusy; }
    set
    {
        _isBusy = value;
        RaisePropertyChanged("IsBusy");
    }
}
private string _showMessage;
public string ShowMessage
{
    get { return _showMessage; }
    set
    {
        _showMessage = value;
        RaisePropertyChanged("ShowMessage");
    }
}

我的VM继承自ViewModelBase (MVVM Light)

从另一个线程更新ObservableCollection

我假设你的ShowMessage是这样定义的:

     private string _ShowMessage ;
    public string ShowMessage 
    {
        get
        {
            return _ShowMessage;
        }
        set
        {
            this.Set<string>("ShowMessage ", ref this._ShowMessage , value);
        }
    }

与你的IsBusy属性相同:

         private string _IsBusy ;
    public bool IsBusy
    {
        get
        {
            return _IsBusy ;
        }
        set
        {
            this.Set<bool>("IsBusy ", ref this._IsBusy , value);
        }
    }

相同
         private string _ShowProgressRing;
    public bool ShowProgressRing 
    {
        get
        {
            return _ShowProgressRing;
        }
        set
        {
            this.Set<bool>("ShowProgressRing", ref this._ShowProgressRing, value);
        }
    }

整个类都继承自ObservableObject，你这么做了吗?

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