ExtensionMethods.SumTSource 方法 (IEnumerableTSource, FuncTSource, __Currency)

 STATIC METHOD Sum<TSource>(
	SELF source AS IEnumerable<TSource>,
	selector AS Func<TSource, CURRENCY>
)
 AS CURRENCY

public static __Currency Sum<TSource>(
	this IEnumerable<TSource> source,
	Func<TSource, __Currency> selector
)