如何在EntityChangeSet银灯中通知DomainServices

Question

首先，我的英语很差，希望你能少学一点！我正在使用DomainServices(DomainContext Class - Namespace: System.ServiceModel.DomainServices.Client)开发silverlight应用程序来检索和更新数据。我有一些属性：

DomainContextVBHS _Service = new DomainContextVBHS();


public int AddedEntitiesCount
{
    get{ return _Service.EntityContainer.GetChanges().AddedEntities.Count; }
}

public int ModifiedEntitiesCount
{
    get{ return _Service.EntityContainer.GetChanges().ModifiedEntities.Count; }
}
public int RemovedEntitiesCount
{
    get{ return _Service.EntityContainer.GetChanges().RemovedEntities.Count; }
}

当_Service得到任何更改时，我如何在UI上通知他们？

Answer 1

更新:这里的示例代码：https://dl.dropboxusercontent.com/u/8424800/StackOverflowHasChanges.zip

我用反编译器快速查看了源代码。没有官方规定的办法。幸运的是，如果您愿意听取所有内部实体集上的所有属性更改事件，您应该能够实现您所追求的目标。

公共类示例: INotifyPropertyChanged {

    SampleDomainContext _Service = new SampleDomainContext();

    public Sample()
    {
        _Service.Load(_Service.GetCustomersQuery());

        _Service.Customers.PropertyChanged += PropChanged;
        //_Service.Orders.PropertyChanged += PropChanged;
        // etc.
    }

    public int AddedEntitiesCount
    {
        get { return _Service.EntityContainer.GetChanges().AddedEntities.Count; }
    }

    public int ModifiedEntitiesCount
    {
        get { return _Service.EntityContainer.GetChanges().ModifiedEntities.Count; }
    }
    public int RemovedEntitiesCount
    {
        get { return _Service.EntityContainer.GetChanges().RemovedEntities.Count; }
    }

    public void PropChanged(object sender, PropertyChangedEventArgs e)
    {
        var pc = this.PropertyChanged;
        if (pc != null)
        {
            pc(this, new PropertyChangedEventArgs("AddedEntitiesCount"));
            pc(this, new PropertyChangedEventArgs("ModifiedEntitiesCount"));
            pc(this, new PropertyChangedEventArgs("RemovedEntitiesCount"));
            // etc
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;


}