'宣言 Public Overridable Sub IncreaseWith( _ ByVal value As T, _ ByVal sumMethod As Func(Of T,Nullable(Of Decimal),Nullable(Of Decimal)) _ )
public virtual void IncreaseWith( T value, Func<T,Nullable<decimal>,Nullable<decimal>> sumMethod )
AverageValue<T> クラス AverageValue<T> メンバ