public int Delete(Expression <Func <T, bool> > whereExpression)
{
using (var context = GetContext())
{
OnDataChanged?.BeginInvoke(this, new DataChangedEventArgs <T>(ChangedTypes.Deleted), null, null);
return(context.Set <T>().Where(whereExpression).Delete());
}
}
public int Insert(T entity)
{
using (var context = GetContext())
{
OnDataChanged?.BeginInvoke(this, new DataChangedEventArgs <T>(ChangedTypes.Inserted), null, null);
context.Set <T>().Add(entity);
return(context.SaveChanges());
}
}
public IEnumerable <T> Insert(IEnumerable <T> entities)
{
using (var context = GetContext())
{
OnDataChanged?.BeginInvoke(this, new DataChangedEventArgs <T>(ChangedTypes.Inserted), null, null);
context.Set <T>().AddRange(entities);
var result = context.SaveChanges();
if (result > 0)
{
return(entities);
}
return(null);
}
}
/// <summary>
/// 处理订阅事件
/// </summary>
/// <param name="item"></param>
/// <param name="e"></param>
private void OnMonitoredNotification(MonitoredItem item, MonitoredItemNotificationEventArgs e)
{
MonitoredItemNotification notification = e.NotificationValue as MonitoredItemNotification;
var node = e.NotificationValue as NodeId;
var opcUaDataItem = this.OpcUaDataItems.FirstOrDefault(a => a.Name == item.ResolvedNodeId.ToString());
if (!Equals(opcUaDataItem, null))
{
opcUaDataItem.OldValue = opcUaDataItem.NewValue;
opcUaDataItem.NewValue = notification?.Value.Value;
opcUaDataItem.OpcUaStatusCodes = (OpcUaStatusCodes)notification?.Value.StatusCode.Code;
OpcUaDataEventArgs args = new OpcUaDataEventArgs(opcUaDataItem.OpcUaStatusCodes, opcUaDataItem);
OnDataChanged?.BeginInvoke(this, args, new AsyncCallback((a) =>
{
if (a.IsCompleted)
{
OnDataChanged?.EndInvoke(a);
}
}), null);
}
}