'宣言 Protected MustOverride Function BuildFlexChart() As ChartBase
'使用法 Dim instance As FlexChartFieldBase Dim value As ChartBase value = instance.BuildFlexChart()
protected abstract ChartBase BuildFlexChart()
'宣言 Protected MustOverride Function BuildFlexChart() As ChartBase
'使用法 Dim instance As FlexChartFieldBase Dim value As ChartBase value = instance.BuildFlexChart()
protected abstract ChartBase BuildFlexChart()