/// <summary>
/// 计算表达式字典
/// </summary>
/// <param name="strFuncName"></param>
/// <param name="arrParams"></param>
/// <param name="calcContext"></param>
/// <returns></returns>
private static object CalculateExpressionDictionary(string strFuncName, ParamObjectCollection arrParams, CalculateContext calcContext)
{
ExpressionDictionaryCollection dictionaries = (ExpressionDictionaryCollection)ObjectContextCache.Instance.GetOrAddNewValue(
"ExpressionDictionaries",
(cache, key) =>
{
ExpressionDictionaryCollection expDicts = new ExpressionDictionaryCollection();
expDicts.InitFromConfiguration(ExpressionDictionarySettings.GetConfig());
cache.Add("ExpressionDictionaries", expDicts);
return(expDicts);
});
ExpressionDictionary dictionary = dictionaries[strFuncName];
object oValue = null;
if (dictionary != null)
{
ExpressionDictionaryCalculatorContext context = new ExpressionDictionaryCalculatorContext(dictionary, calcContext.CallerContxt);
string key = string.Empty;
if (arrParams.Count > 0 && arrParams[0].Value != null)
{
key = arrParams[0].Value.ToString();
}
oValue = dictionary.Calculator.Calculate(strFuncName, key, context);
}
return(oValue);
}
/// <summary>
///
/// </summary>
/// <param name="settings"></param>
public void InitFromConfiguration(ExpressionDictionarySettings settings)
{
settings.NullCheck("settings");
foreach (ExpressionDictionaryConfigurationElement element in settings.Dictionaries)
{
this.Add(new ExpressionDictionary(element));
}
}
/// <summary>
/// 获得表达式预定义字典的配置信息
/// </summary>
/// <returns></returns>
public static ExpressionDictionarySettings GetConfig()
{
ExpressionDictionarySettings settings = (ExpressionDictionarySettings)ConfigurationBroker.GetSection("expressionDictionarySettings");
if (settings == null)
{
settings = new ExpressionDictionarySettings();
}
return(settings);
}
