我遇到了一个非常奇怪的问题。
基本思想是我有一个类来保存从交易 api 收到的关于外汇价格的数据。每个属性都已使用 NotifyPropertyChanged 方法设置，如下所示。
class RealTimeBar
{
public event PropertyChangedEventHandler PropertyChanged;
private const double EPSILON = 0.0000001;
private int _id;
private string _symbol;
private int _time;
private float _open;
private float _high;
private float _low;
private float _close;
int _volume;
public RealTimeBar(int id, string symbol)
{
_id = id;
_symbol = symbol;
}
private void NotifyPropertyChanged(String info)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(info));
}
}
public int Id
{
get
{
return _id;
}
set
{
_id = value;
}
}
public string Symbol
{
get
{
return _symbol;
}
set
{
if (value != _symbol)
{
_symbol = value;
NotifyPropertyChanged("Symbol");
}
}
}
public int Time
{
get
{
return _time;
}
set
{
if (value != _time)
{
_time = value;
NotifyPropertyChanged("Time");
}
}
}
public float Open
{
get
{
return _open;
}
set
{
if (value != _open)
{
_open = value;
NotifyPropertyChanged("Open");
}
}
}
public float High
{
get
{
return _high;
}
set
{
if (value != _high)
{
_high = value;
NotifyPropertyChanged("High");
}
}
}
public float Low
{
get
{
return _low;
}
set
{
if (value != _low)
{
_low = value;
NotifyPropertyChanged("Low");
}
}
}
public float Close
{
get
{
return _close;
}
set
{
if (value != _close)
{
_close = value;
NotifyPropertyChanged("Close");
}
}
}
public int Volume
{
get
{
return _volume;
}
set
{
if (value != _volume)
{
_volume = value;
NotifyPropertyChanged("Volume");
}
}
}
}
它是一个很长的类，但结构简单，如您所见。现在我连接到向我触发事件的 api，并通过将 api 的值设置为我定义的类来处理它。
BindingList<RealTimeBar> _realTimeBarList = new BindingList<RealTimeBar>();
public Hashtable _iForexHashtable = new Hashtable();
private void _UpdateForexQuote(int tickerId, int time, double open, double high, double low, double close, int volume,
double wap, int count)
{
///MessageBox.Show(tickerId.ToString());
((RealTimeBar)_iForexHashtable[tickerId]).Open = (float)open;
((RealTimeBar)_iForexHashtable[tickerId]).High = (float)high;
((RealTimeBar)_iForexHashtable[tickerId]).Low = (float)low;
((RealTimeBar)_iForexHashtable[tickerId]).Close = (float)close;
((RealTimeBar)_iForexHashtable[tickerId]).Volume = volume;
}
经过一些设置后，_UpdateForexQuote 方法会将传入的信息分发到 RealTimeBar 类的属性中。一切都很好。
当我启动程序时，它不会更新。我以为没有数据进来。但是当我随机单击gridcontrol的A1cell中的某个位置，然后单击另一个B1cell时，之前的A1cell会更新。然后，如果我单击 C1cell，则 B1cell 将更新。如果您不单击一个单元格，它将永远不会更新。我给你看图：
如您所见，单击前三行后，前三行显示延迟数据，由于我从未触摸第四行，因此显示为零。条件是我刚刚单击了第五行 Low 单元格，这就是 Low 不更新但其他单元格更新的原因。这很奇怪。我之前在 devexpress 11 和 vs 2010 下使用相同的代码。但是现在在 devexpress 12 和 vs 2012 下，我遇到了这个以前从未发生过的问题。
更新：
下面是我使用的方法 1. 定义 bindinglist 和一个 hashtable， 2. 先将对象放入 hashtable，然后将 hashtable 中的对象添加到 bindinglist 3. 将 bindinglist 绑定到 gridcontrol。
private void earningButtonItem_ItemClick(object sender, ItemClickEventArgs e)
{
_iTimer.AutoReset = false;
_iTimer.Enabled = false;
switchStockPool = "Earning Stock";
disconnectButtonItem.PerformClick();
connectButtonItem.PerformClick();
_iheitanshaoEarningDBConnect = new DBConnect("heitanshaoearning");
List<string>[] tempList;
int tempHash;
tempList = _iheitanshaoEarningDBConnect.SelectSymbolHighLow();
_quoteEarningOnGridList.Clear();
///tempList[0].Count
for (int i = 0; i < tempList[0].Count; i++)
{
tempHash = Convert.ToInt32(tempList[0][i].ToString().GetHashCode());
_iStockEarningHistHashtable[tempHash] = new QuoteOnGridHist(tempList[0][i], (float)Convert.ToSingle(tempList[1][i]), (float)Convert.ToSingle(tempList[2][i]), (float)Convert.ToSingle(tempList[3][i]));
_iStockEarningHashtable[tempHash] = new QuoteOnGrid(tempList[0][i], 0, 0);
_quoteEarningOnGridList.Add((QuoteOnGrid)_iStockEarningHashtable[tempHash]);
reqMktDataExStock(tempHash, tempList[0][i].ToString());
}
List<string>[] tempVolumeList;
tempVolumeList = _iheitanshaoEarningDBConnect.SelectAverageVolume();
for (int i = 0; i < tempList[0].Count; i++)
{
tempHash = Convert.ToInt32(tempVolumeList[0][i].ToString().GetHashCode());
((QuoteOnGrid)_iStockEarningHashtable[tempHash]).Average_Volume = ((float)Convert.ToSingle(tempVolumeList[1][i])) / volumeDenominator;
}
gridControl.DataSource = _quoteEarningOnGridList;
}
/////////////////////
现在当价格更新事件到来时，下面的方法将更新哈希表中的对象属性。由于我在对象中定义了 Notifypropertychanged，它应该更新 bingdinglist 和 gridcontrol 中的对象。
private void _UpdateStockMarketQuote(int tikcerId, int field, double price, int canAutoExecute)
{
////MessageBox.Show(tikcerId.ToString() + field.ToString() + price.ToString());
if (switchStockPool == "Selected Stock")
{
if (field == 4)
{
((QuoteOnGrid)_iStockHashtable[tikcerId]).Gap_From_High = ((float)price - ((QuoteOnGridHist)_iStockHistHashtable[tikcerId]).High) / ((QuoteOnGridHist)_iStockHistHashtable[tikcerId]).Close;
((QuoteOnGrid)_iStockHashtable[tikcerId]).Gap_From_Low = ((float)price - ((QuoteOnGridHist)_iStockHistHashtable[tikcerId]).Low) / ((QuoteOnGridHist)_iStockHistHashtable[tikcerId]).Close;
((QuoteOnGrid)_iStockHashtable[tikcerId]).Last_Price = (float)price;
}
//else if (field == 1)
//{
// ((QuoteOnGrid)_iStockHashtable[tikcerId]).Gap_From_High = ((float)price - ((QuoteOnGridHist)_iStockHistHashtable[tikcerId]).High) / ((QuoteOnGridHist)_iStockHistHashtable[tikcerId]).Close;
// ((QuoteOnGrid)_iStockHashtable[tikcerId]).Gap_From_Low = ((float)price - ((QuoteOnGridHist)_iStockHistHashtable[tikcerId]).Low) / ((QuoteOnGridHist)_iStockHistHashtable[tikcerId]).Close;
//}
}
else if (switchStockPool == "Earning Stock")
{
if (field == 4)
{
((QuoteOnGrid)_iStockEarningHashtable[tikcerId]).Gap_From_High = ((float)price - ((QuoteOnGridHist)_iStockEarningHistHashtable[tikcerId]).High) / ((QuoteOnGridHist)_iStockEarningHistHashtable[tikcerId]).Close;
((QuoteOnGrid)_iStockEarningHashtable[tikcerId]).Gap_From_Low = ((float)price - ((QuoteOnGridHist)_iStockEarningHistHashtable[tikcerId]).Low) / ((QuoteOnGridHist)_iStockEarningHistHashtable[tikcerId]).Close;
((QuoteOnGrid)_iStockEarningHashtable[tikcerId]).Last_Price = (float)price;
}
//else if (field == 1)
//{
// ((quoteongrid)_istockearninghashtable[tikcerid]).gap_from_high = ((float)price - ((quoteongridhist)_istockearninghisthashtable[tikcerid]).high) / ((quoteongridhist)_istockearninghisthashtable[tikcerid]).close;
// ((quoteongrid)_istockearninghashtable[tikcerid]).gap_from_low = ((float)price - ((quoteongridhist)_istockearninghisthashtable[tikcerid]).low) / ((quoteongridhist)_istockearninghisthashtable[tikcerid]).close;
//}
}
}