private static object UserFunctionImpl(string funcName, ParamObjectCollection arrParams, object callerContext)
{
object result = null;
switch (funcName.ToLower())
{
case "power":
result = Math.Pow(Decimal.ToDouble((decimal)arrParams[0].Value),
Decimal.ToDouble((decimal)arrParams[1].Value));
break;
case "expparse":
result = ExpressionParser.Parse((string)arrParams[0].Value).Identifiers.ToString();
break;
case "author":
result = "Shen Zheng";
break;
default:
if (BuiltInFunctionsCalculator.Instance.IsFunction(funcName))
{
result = BuiltInFunctionHelper.ExecuteFunction(funcName, BuiltInFunctionsCalculator.Instance, arrParams, callerContext);
}
else
{
throw new ApplicationException(string.Format("'{0}'是一个无法识别的标识符.", funcName));
}
break;
}
return(result);
}
public object CalculateUserFunction(string funcName, ParamObjectCollection arrParams, object callerContext)
{
object result = null;
if (this.IsFunction(funcName))
{
result = BuiltInFunctionHelper.ExecuteFunction(funcName, this, arrParams, callerContext);
}
return(result);
}
/// <summary>
/// 计算内置函数
/// </summary>
/// <param name="funcName"></param>
/// <param name="arrParams"></param>
/// <param name="callerContext"></param>
/// <returns></returns>
public object Calculate(string funcName, ParamObjectCollection arrParams, object callerContext)
{
object result = null;
if (WfCreateActivityBuiltInFunctions.Instance.IsFunction(funcName) == false)
{
result = MatchedActivityKey(funcName, (WfCreateActivityFunctionContext)callerContext);
if (result == null || (string)result == string.Empty)
{
throw new InvalidOperationException(string.Format("\"{0}\"是非法的函数名称", funcName));
}
}
else
{
result = BuiltInFunctionHelper.ExecuteFunction(funcName, this, arrParams, callerContext);
}
return(result);
}
/// <summary>
/// 计算内置函数
/// </summary>
/// <param name="funcName"></param>
/// <param name="arrParams"></param>
/// <param name="callerContext"></param>
/// <returns></returns>
public object Calculate(string funcName, ParamObjectCollection arrParams, object callerContext)
{
return(BuiltInFunctionHelper.ExecuteFunction(funcName, this, arrParams, callerContext));
}