private Double ExpCurrentValue(String expression)
{
RTInterface RTDataAccess = DBAccess.GetRealTime();
try {
if (String.IsNullOrEmpty(expression))
{
return(Double.MinValue);
}
int pos = expression.LastIndexOf("'") - 1;
if (pos <= 0)
{
return(double.MinValue);
}
String tagName = expression.Substring(1, pos);
double tagValue = RTDataAccess.GetSnapshotValue(tagName);
String Token = expression.Substring(pos + 2, 1);
pos = expression.IndexOf(Token) + 1;
String Val = expression.Substring(pos, expression.Length - pos);
double targetValue = Convert.ToDouble(Val);
return(tagValue - targetValue);
}
catch (Exception ex) {
m_Loger.Error("解析机组运行条件处发生错误", ex);
return(double.MinValue);
}
}
/// <summary>
/// 根据当前电量和上一时刻电量计算电量差值
/// </summary>
/// <param name="tagName"></param>
/// <param name="span"></param>
/// <returns></returns>
private double PowerDiff(String tagName, double span)
{
double Result = 0.0f;
DateTime LastTime = DateTime.Now.AddMinutes(-1 * span); //上一时刻
//RTInterface RTDataAccess = DBAccess.GetRealTime();
double CurrentValue = RTDataAccess.GetSnapshotValue(tagName); //当前值
double LastValue = RTDataAccess.GetArchiveValue(tagName, LastTime); //上一时刻值
Result = CurrentValue - LastValue;
return(Result);
}