// Queryable's "single value" standard query operators call this method.
// It is also called from QueryableTerraServerData.GetEnumerator().
public TResult Execute <TResult>(Expression expression)
{
//bool IsEnumerable = (typeof(TResult).Name == "IEnumerable`1");
var obj = DataQueryContext.Execute <TResult>(expression);
var resultType = typeof(TResult);
if (resultType.IsValueType || resultType == typeof(string))
{
return(DataConvert.Convert <TResult>(obj));//例如求平均数,TResult可能是double,而实际得到的结果为int,int不能直接强制转换为double.
}
return((TResult)obj);
}
public object Execute(Expression expression)
{
//return DataQueryContext.Execute(expression,false);
return(DataQueryContext.Execute <object>(expression));
}
