/// <summary>
/// 主通信流程：Step 6：根据数据更新上位机相关信息
/// </summary>
protected void Update()
{
DateTime dt = DateTime.Now;
if (DataChange != null)
{
HistoryData[] values = new HistoryData[_changedList.Count];
int i = 0;
foreach (int index in _changedList)
{
ITag item = _items[index];
var itemData = item.Read();//这是从缓存Cache中读取的数据
if (item.Active)
{
item.Update(itemData, dt, QUALITIES.QUALITY_GOOD);
}
/*
* 下面的语言判断是否要更新有变化的Itag:
* 1.对敏感度为零的，只要有任何变化都要更新；？？浮点数和零 比较大小
* 2.对于浮点数，新值的变化要超过敏感的 百分比
*/
if (_deadband == 0 || (item.Address.VarType == DataType.FLOAT &&
(Math.Abs(itemData.Single / item.Value.Single - 1) > _deadband)))
{
values[i].ID = item.ID;
values[i].Quality = item.Quality;
values[i].Value = itemData;
values[i].TimeStamp = item.TimeStamp;
i++;
}
}
foreach (DataChangeEventHandler deleg in DataChange.GetInvocationList()) //批量调用绑定在事件上面的委托
{
deleg.BeginInvoke(this, new DataChangeEventArgs(1, values), null, null); //只在这个地方，才去调用绑定的事件，对那些更新周期为零的变量进行存储，存储周期随Group
}
}
else
{
foreach (int index in _changedList)
{
ITag item = _items[index];
if (item.Active)
{
item.Update(item.Read(), dt, QUALITIES.QUALITY_GOOD);
}
}
}
}
protected void Update()
{
DateTime dt = DateTime.Now;
if (DataChange != null)
{
HistoryData[] values = new HistoryData[_changedList.Count];
int i = 0;
foreach (int index in _changedList)
{
ITag item = _items[index];
var itemData = item.Read();
if (item.Active)
{
item.Update(itemData, dt, QUALITIES.QUALITY_GOOD);
}
if (_deadband == 0 || (item.Address.VarType == DataType.FLOAT &&
(Math.Abs(itemData.Single / item.Value.Single - 1) > _deadband)))
{
values[i].ID = item.ID;
values[i].Quality = item.Quality;
values[i].Value = itemData;
values[i].TimeStamp = item.TimeStamp;
i++;
}
}
foreach (DataChangeEventHandler deleg in DataChange.GetInvocationList())
{
deleg.BeginInvoke(this, new DataChangeEventArgs(1, values), null, null);
}
}
else
{
foreach (int index in _changedList)
{
ITag item = _items[index];
if (item.Active)
{
item.Update(item.Read(), dt, QUALITIES.QUALITY_GOOD);
}
}
}
_changedList.Clear();
}